diff --git a/.forgejo/workflows/deps.yml b/.forgejo/workflows/deps.yml
index b29723c..ffaca53 100644
--- a/.forgejo/workflows/deps.yml
+++ b/.forgejo/workflows/deps.yml
@@ -12,10 +12,10 @@ jobs:
     outputs:
       cache-primary-key: ${{ steps.restore-deps.outputs.cache-primary-key }}
     steps:
-      - uses: https://git.libre-chip.org/mirrors/checkout@v3
+      - uses: https://code.forgejo.org/actions/checkout@v3
         with:
           fetch-depth: 0
-      - uses: https://git.libre-chip.org/mirrors/cache/restore@v3
+      - uses: https://code.forgejo.org/actions/cache/restore@v3
         id: restore-deps
         with:
           path: deps
@@ -58,19 +58,19 @@ jobs:
       - name: Get SymbiYosys
         if: steps.restore-deps.outputs.cache-hit != 'true'
         run: |
-          git clone --depth=1 --branch=yosys-0.45 https://git.libre-chip.org/mirrors/sby deps/sby
+          git clone --depth=1 --branch=yosys-0.45 https://github.com/YosysHQ/sby.git deps/sby
       - name: Build Z3
         if: steps.restore-deps.outputs.cache-hit != 'true'
         run: |
-          git clone --depth=1 --recursive --branch=z3-4.13.3 https://git.libre-chip.org/mirrors/z3 deps/z3
+          git clone --depth=1 --recursive --branch=z3-4.13.3 https://github.com/Z3Prover/z3.git deps/z3
           (cd deps/z3; PYTHON=python3 ./configure --prefix=/usr/local)
           make -C deps/z3/build -j"$(nproc)"
       - name: Build Yosys
         if: steps.restore-deps.outputs.cache-hit != 'true'
         run: |
-          git clone --depth=1 --recursive --branch=0.45 https://git.libre-chip.org/mirrors/yosys deps/yosys
+          git clone --depth=1 --recursive --branch=0.45 https://github.com/YosysHQ/yosys.git deps/yosys
           make -C deps/yosys -j"$(nproc)"
-      - uses: https://git.libre-chip.org/mirrors/cache/save@v3
+      - uses: https://code.forgejo.org/actions/cache/save@v3
         if: steps.restore-deps.outputs.cache-hit != 'true'
         with:
           path: deps
diff --git a/.forgejo/workflows/test.yml b/.forgejo/workflows/test.yml
index 49fb3e4..e83c668 100644
--- a/.forgejo/workflows/test.yml
+++ b/.forgejo/workflows/test.yml
@@ -9,7 +9,7 @@ jobs:
     runs-on: debian-12
     needs: deps
     steps:
-      - uses: https://git.libre-chip.org/mirrors/checkout@v3
+      - uses: https://code.forgejo.org/actions/checkout@v3
         with:
           fetch-depth: 0
       - run: |
@@ -41,7 +41,7 @@ jobs:
           curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain 1.82.0
           source "$HOME/.cargo/env"
           echo "$PATH" >> "$GITHUB_PATH"
-      - uses: https://git.libre-chip.org/mirrors/cache/restore@v3
+      - uses: https://code.forgejo.org/actions/cache/restore@v3
         with:
           path: deps
           key: ${{ needs.deps.outputs.cache-primary-key }}
@@ -52,7 +52,7 @@ jobs:
           make -C deps/yosys install
           export PATH="$(realpath deps/firtool/bin):$PATH"
           echo "$PATH" >> "$GITHUB_PATH"
-      - uses: https://git.libre-chip.org/mirrors/rust-cache@v2
+      - uses: https://github.com/Swatinem/rust-cache@v2
         with:
           save-if: ${{ github.ref == 'refs/heads/master' }}
       - run: cargo test
diff --git a/crates/fayalite-proc-macros-impl/src/hdl_bundle.rs b/crates/fayalite-proc-macros-impl/src/hdl_bundle.rs
index b0fe498..79326e2 100644
--- a/crates/fayalite-proc-macros-impl/src/hdl_bundle.rs
+++ b/crates/fayalite-proc-macros-impl/src/hdl_bundle.rs
@@ -83,7 +83,6 @@ impl ParsedBundle {
             custom_bounds,
             no_static: _,
             no_runtime_generics: _,
-            cmp_eq: _,
         } = options.body;
         let mut fields = match fields {
             syn::Fields::Named(fields) => fields,
@@ -438,7 +437,6 @@ impl ToTokens for ParsedBundle {
             custom_bounds: _,
             no_static,
             no_runtime_generics,
-            cmp_eq,
         } = &options.body;
         let target = get_target(target, ident);
         let mut item_attrs = attrs.clone();
@@ -767,69 +765,6 @@ impl ToTokens for ParsedBundle {
             }
         }
         .to_tokens(tokens);
-        if let Some((cmp_eq,)) = cmp_eq {
-            let mut where_clause =
-                Generics::from(generics)
-                    .where_clause
-                    .unwrap_or_else(|| syn::WhereClause {
-                        where_token: Token![where](span),
-                        predicates: Punctuated::new(),
-                    });
-            let mut fields_cmp_eq = vec![];
-            let mut fields_cmp_ne = vec![];
-            for field in fields.named() {
-                let field_ident = field.ident();
-                let field_ty = field.ty();
-                where_clause
-                    .predicates
-                    .push(parse_quote_spanned! {cmp_eq.span=>
-                        #field_ty: ::fayalite::expr::ops::ExprPartialEq<#field_ty>
-                    });
-                fields_cmp_eq.push(quote_spanned! {span=>
-                    ::fayalite::expr::ops::ExprPartialEq::cmp_eq(__lhs.#field_ident, __rhs.#field_ident)
-                });
-                fields_cmp_ne.push(quote_spanned! {span=>
-                    ::fayalite::expr::ops::ExprPartialEq::cmp_ne(__lhs.#field_ident, __rhs.#field_ident)
-                });
-            }
-            let cmp_eq_body;
-            let cmp_ne_body;
-            if fields_len == 0 {
-                cmp_eq_body = quote_spanned! {span=>
-                    ::fayalite::expr::ToExpr::to_expr(&true)
-                };
-                cmp_ne_body = quote_spanned! {span=>
-                    ::fayalite::expr::ToExpr::to_expr(&false)
-                };
-            } else {
-                cmp_eq_body = quote_spanned! {span=>
-                    #(#fields_cmp_eq)&*
-                };
-                cmp_ne_body = quote_spanned! {span=>
-                    #(#fields_cmp_ne)|*
-                };
-            };
-            quote_spanned! {span=>
-                #[automatically_derived]
-                impl #impl_generics ::fayalite::expr::ops::ExprPartialEq<Self> for #target #type_generics
-                #where_clause
-                {
-                    fn cmp_eq(
-                        __lhs: ::fayalite::expr::Expr<Self>,
-                        __rhs: ::fayalite::expr::Expr<Self>,
-                    ) -> ::fayalite::expr::Expr<::fayalite::int::Bool> {
-                        #cmp_eq_body
-                    }
-                    fn cmp_ne(
-                        __lhs: ::fayalite::expr::Expr<Self>,
-                        __rhs: ::fayalite::expr::Expr<Self>,
-                    ) -> ::fayalite::expr::Expr<::fayalite::int::Bool> {
-                        #cmp_ne_body
-                    }
-                }
-            }
-            .to_tokens(tokens);
-        }
         if let (None, MaybeParsed::Parsed(generics)) = (no_static, &self.generics) {
             let static_generics = generics.clone().for_static_type();
             let (static_impl_generics, static_type_generics, static_where_clause) =
diff --git a/crates/fayalite-proc-macros-impl/src/hdl_enum.rs b/crates/fayalite-proc-macros-impl/src/hdl_enum.rs
index 9174566..1d16177 100644
--- a/crates/fayalite-proc-macros-impl/src/hdl_enum.rs
+++ b/crates/fayalite-proc-macros-impl/src/hdl_enum.rs
@@ -155,11 +155,7 @@ impl ParsedEnum {
             custom_bounds,
             no_static: _,
             no_runtime_generics: _,
-            cmp_eq,
         } = options.body;
-        if let Some((cmp_eq,)) = cmp_eq {
-            errors.error(cmp_eq, "#[hdl(cmp_eq)] is not yet implemented for enums");
-        }
         attrs.retain(|attr| {
             if attr.path().is_ident("repr") {
                 errors.error(attr, "#[repr] is not supported on #[hdl] enums");
@@ -215,7 +211,6 @@ impl ToTokens for ParsedEnum {
             custom_bounds: _,
             no_static,
             no_runtime_generics,
-            cmp_eq: _, // TODO: implement cmp_eq for enums
         } = &options.body;
         let target = get_target(target, ident);
         let mut struct_attrs = attrs.clone();
diff --git a/crates/fayalite-proc-macros-impl/src/hdl_type_alias.rs b/crates/fayalite-proc-macros-impl/src/hdl_type_alias.rs
index 97501e7..e5d5f7b 100644
--- a/crates/fayalite-proc-macros-impl/src/hdl_type_alias.rs
+++ b/crates/fayalite-proc-macros-impl/src/hdl_type_alias.rs
@@ -49,14 +49,10 @@ impl ParsedTypeAlias {
             custom_bounds,
             no_static,
             no_runtime_generics: _,
-            cmp_eq,
         } = options.body;
         if let Some((no_static,)) = no_static {
             errors.error(no_static, "no_static is not valid on type aliases");
         }
-        if let Some((cmp_eq,)) = cmp_eq {
-            errors.error(cmp_eq, "cmp_eq is not valid on type aliases");
-        }
         let generics = if custom_bounds.is_some() {
             MaybeParsed::Unrecognized(generics)
         } else if let Some(generics) = errors.ok(ParsedGenerics::parse(&mut generics)) {
@@ -99,7 +95,6 @@ impl ToTokens for ParsedTypeAlias {
             custom_bounds: _,
             no_static: _,
             no_runtime_generics,
-            cmp_eq: _,
         } = &options.body;
         let target = get_target(target, ident);
         let mut type_attrs = attrs.clone();
diff --git a/crates/fayalite-proc-macros-impl/src/hdl_type_common.rs b/crates/fayalite-proc-macros-impl/src/hdl_type_common.rs
index 2da0915..6193dc3 100644
--- a/crates/fayalite-proc-macros-impl/src/hdl_type_common.rs
+++ b/crates/fayalite-proc-macros-impl/src/hdl_type_common.rs
@@ -26,7 +26,6 @@ crate::options! {
         CustomBounds(custom_bounds),
         NoStatic(no_static),
         NoRuntimeGenerics(no_runtime_generics),
-        CmpEq(cmp_eq),
     }
 }
 
@@ -2070,16 +2069,11 @@ macro_rules! impl_bounds {
             $(
                 $Variant:ident,
             )*
-            $(
-                #[unknown]
-                $Unknown:ident,
-            )?
         }
     ) => {
         #[derive(Clone, Debug)]
         $vis enum $enum_type {
             $($Variant(known_items::$Variant),)*
-            $($Unknown(syn::TypeParamBound),)?
         }
 
         $(impl From<known_items::$Variant> for $enum_type {
@@ -2092,54 +2086,28 @@ macro_rules! impl_bounds {
             fn to_tokens(&self, tokens: &mut TokenStream) {
                 match self {
                     $(Self::$Variant(v) => v.to_tokens(tokens),)*
-                    $(Self::$Unknown(v) => v.to_tokens(tokens),)?
                 }
             }
         }
 
         impl $enum_type {
             $vis fn parse_path(path: Path) -> Result<Self, Path> {
-                #![allow(unreachable_code)]
                 $(let path = match known_items::$Variant::parse_path(path) {
                     Ok(v) => return Ok(Self::$Variant(v)),
                     Err(path) => path,
                 };)*
-                $(return Ok(Self::$Unknown(syn::TraitBound {
-                    paren_token: None,
-                    modifier: syn::TraitBoundModifier::None,
-                    lifetimes: None,
-                    path,
-                }.into()));)?
                 Err(path)
             }
-            $vis fn parse_type_param_bound(mut type_param_bound: syn::TypeParamBound) -> Result<Self, syn::TypeParamBound> {
-                #![allow(unreachable_code)]
-                if let syn::TypeParamBound::Trait(mut trait_bound) = type_param_bound {
-                    if let syn::TraitBound {
-                        paren_token: _,
-                        modifier: syn::TraitBoundModifier::None,
-                        lifetimes: None,
-                        path: _,
-                    } = trait_bound {
-                        match Self::parse_path(trait_bound.path) {
-                            Ok(retval) => return Ok(retval),
-                            Err(path) => trait_bound.path = path,
-                        }
-                    }
-                    type_param_bound = trait_bound.into();
-                }
-                $(return Ok(Self::$Unknown(type_param_bound));)?
-                Err(type_param_bound)
-            }
         }
 
         impl Parse for $enum_type {
             fn parse(input: ParseStream) -> syn::Result<Self> {
-                Self::parse_type_param_bound(input.parse()?)
-                    .map_err(|type_param_bound| syn::Error::new_spanned(
-                        type_param_bound,
+                Self::parse_path(Path::parse_mod_style(input)?).map_err(|path| {
+                    syn::Error::new_spanned(
+                        path,
                         format_args!("expected one of: {}", [$(stringify!($Variant)),*].join(", ")),
-                    ))
+                    )
+                })
             }
         }
 
@@ -2147,7 +2115,6 @@ macro_rules! impl_bounds {
         #[allow(non_snake_case)]
         $vis struct $struct_type {
             $($vis $Variant: Option<known_items::$Variant>,)*
-            $($vis $Unknown: Vec<syn::TypeParamBound>,)?
         }
 
         impl ToTokens for $struct_type {
@@ -2159,63 +2126,42 @@ macro_rules! impl_bounds {
                     separator = Some(<Token![+]>::default());
                     v.to_tokens(tokens);
                 })*
-                $(for v in &self.$Unknown {
-                    separator.to_tokens(tokens);
-                    separator = Some(<Token![+]>::default());
-                    v.to_tokens(tokens);
-                })*
             }
         }
 
         const _: () = {
             #[derive(Clone, Debug)]
-            #[allow(non_snake_case)]
-            $vis struct Iter {
-                $($Variant: Option<known_items::$Variant>,)*
-                $($Unknown: std::vec::IntoIter<syn::TypeParamBound>,)?
-            }
+            $vis struct Iter($vis $struct_type);
 
             impl IntoIterator for $struct_type {
                 type Item = $enum_type;
                 type IntoIter = Iter;
 
                 fn into_iter(self) -> Self::IntoIter {
-                    Iter {
-                        $($Variant: self.$Variant,)*
-                        $($Unknown: self.$Unknown.into_iter(),)?
-                    }
+                    Iter(self)
                 }
             }
 
             impl Iterator for Iter {
                 type Item = $enum_type;
 
+
                 fn next(&mut self) -> Option<Self::Item> {
                     $(
-                        if let Some(value) = self.$Variant.take() {
+                        if let Some(value) = self.0.$Variant.take() {
                             return Some($enum_type::$Variant(value));
                         }
                     )*
-                    $(
-                        if let Some(value) = self.$Unknown.next() {
-                            return Some($enum_type::$Unknown(value));
-                        }
-                    )?
                     None
                 }
 
                 #[allow(unused_mut, unused_variables)]
                 fn fold<B, F: FnMut(B, Self::Item) -> B>(mut self, mut init: B, mut f: F) -> B {
                     $(
-                        if let Some(value) = self.$Variant.take() {
+                        if let Some(value) = self.0.$Variant.take() {
                             init = f(init, $enum_type::$Variant(value));
                         }
                     )*
-                    $(
-                        if let Some(value) = self.$Unknown.next() {
-                            init = f(init, $enum_type::$Unknown(value));
-                        }
-                    )?
                     init
                 }
             }
@@ -2227,9 +2173,6 @@ macro_rules! impl_bounds {
                     $($enum_type::$Variant(v) => {
                         self.$Variant = Some(v);
                     })*
-                    $($enum_type::$Unknown(v) => {
-                        self.$Unknown.push(v);
-                    })?
                 });
             }
         }
@@ -2248,7 +2191,6 @@ macro_rules! impl_bounds {
                     $(if let Some(v) = v.$Variant {
                         self.$Variant = Some(v);
                     })*
-                    $(self.$Unknown.extend(v.$Unknown);)*
                 });
             }
         }
@@ -2302,8 +2244,6 @@ impl_bounds! {
         Size,
         StaticType,
         Type,
-        #[unknown]
-        Unknown,
     }
 }
 
@@ -2317,8 +2257,6 @@ impl_bounds! {
         ResetType,
         StaticType,
         Type,
-        #[unknown]
-        Unknown,
     }
 }
 
@@ -2332,7 +2270,6 @@ impl From<ParsedTypeBound> for ParsedBound {
             ParsedTypeBound::ResetType(v) => ParsedBound::ResetType(v),
             ParsedTypeBound::StaticType(v) => ParsedBound::StaticType(v),
             ParsedTypeBound::Type(v) => ParsedBound::Type(v),
-            ParsedTypeBound::Unknown(v) => ParsedBound::Unknown(v),
         }
     }
 }
@@ -2347,7 +2284,6 @@ impl From<ParsedTypeBounds> for ParsedBounds {
             ResetType,
             StaticType,
             Type,
-            Unknown,
         } = value;
         Self {
             BoolOrIntType,
@@ -2359,7 +2295,6 @@ impl From<ParsedTypeBounds> for ParsedBounds {
             Size: None,
             StaticType,
             Type,
-            Unknown,
         }
     }
 }
@@ -2395,7 +2330,6 @@ impl ParsedTypeBound {
                 ParsedTypeBound::Type(known_items::Type(span)),
             ]),
             Self::Type(v) => ParsedTypeBounds::from_iter([ParsedTypeBound::from(v)]),
-            Self::Unknown(v) => ParsedTypeBounds::from_iter([ParsedTypeBound::Unknown(v)]),
         }
     }
 }
@@ -2430,7 +2364,6 @@ impl From<ParsedSizeTypeBounds> for ParsedBounds {
             Size,
             StaticType: None,
             Type: None,
-            Unknown: vec![],
         }
     }
 }
@@ -2458,7 +2391,6 @@ impl ParsedBounds {
     fn categorize(self, errors: &mut Errors, span: Span) -> ParsedBoundsCategory {
         let mut type_bounds = None;
         let mut size_type_bounds = None;
-        let mut unknown_bounds = vec![];
         self.into_iter().for_each(|bound| match bound.categorize() {
             ParsedBoundCategory::Type(bound) => {
                 type_bounds
@@ -2470,37 +2402,15 @@ impl ParsedBounds {
                     .get_or_insert_with(ParsedSizeTypeBounds::default)
                     .extend([bound]);
             }
-            ParsedBoundCategory::Unknown(bound) => unknown_bounds.push(bound),
         });
-        match (type_bounds, size_type_bounds, unknown_bounds.is_empty()) {
-            (None, None, true) => ParsedBoundsCategory::Type(ParsedTypeBounds {
+        match (type_bounds, size_type_bounds) {
+            (None, None) => ParsedBoundsCategory::Type(ParsedTypeBounds {
                 Type: Some(known_items::Type(span)),
                 ..Default::default()
             }),
-            (None, None, false) => {
-                errors.error(
-                    unknown_bounds.remove(0),
-                    "unknown bounds: must use at least one known bound (such as `Type`) with any unknown bounds",
-                );
-                ParsedBoundsCategory::Type(ParsedTypeBounds {
-                    Unknown: unknown_bounds,
-                    ..Default::default()
-                })
-            }
-            (None, Some(bounds), true) => ParsedBoundsCategory::SizeType(bounds),
-            (None, Some(bounds), false) => {
-                // TODO: implement
-                errors.error(
-                    unknown_bounds.remove(0),
-                    "unknown bounds with `Size` bounds are not implemented",
-                );
-                ParsedBoundsCategory::SizeType(bounds)
-            }
-            (Some(bounds), None, _) => ParsedBoundsCategory::Type(ParsedTypeBounds {
-                Unknown: unknown_bounds,
-                ..bounds
-            }),
-            (Some(type_bounds), Some(size_type_bounds), _) => {
+            (None, Some(bounds)) => ParsedBoundsCategory::SizeType(bounds),
+            (Some(bounds), None) => ParsedBoundsCategory::Type(bounds),
+            (Some(type_bounds), Some(size_type_bounds)) => {
                 errors.error(
                     size_type_bounds
                         .Size
@@ -2517,7 +2427,6 @@ impl ParsedBounds {
 pub(crate) enum ParsedBoundCategory {
     Type(ParsedTypeBound),
     SizeType(ParsedSizeTypeBound),
-    Unknown(syn::TypeParamBound),
 }
 
 impl ParsedBound {
@@ -2532,14 +2441,12 @@ impl ParsedBound {
             Self::Size(v) => ParsedBoundCategory::SizeType(ParsedSizeTypeBound::Size(v)),
             Self::StaticType(v) => ParsedBoundCategory::Type(ParsedTypeBound::StaticType(v)),
             Self::Type(v) => ParsedBoundCategory::Type(ParsedTypeBound::Type(v)),
-            Self::Unknown(v) => ParsedBoundCategory::Unknown(v),
         }
     }
     fn implied_bounds(self) -> ParsedBounds {
         match self.categorize() {
             ParsedBoundCategory::Type(v) => v.implied_bounds().into(),
             ParsedBoundCategory::SizeType(v) => v.implied_bounds().into(),
-            ParsedBoundCategory::Unknown(v) => ParsedBounds::from_iter([ParsedBound::Unknown(v)]),
         }
     }
 }
@@ -3418,7 +3325,7 @@ impl ParsedGenerics {
                                 | ParsedTypeBound::EnumType(_)
                                 | ParsedTypeBound::IntType(_)
                                 | ParsedTypeBound::ResetType(_) => {
-                                    errors.error(bound, "bounds on mask types are not implemented");
+                                    errors.error(bound, "bound on mask type not implemented");
                                 }
                                 ParsedTypeBound::StaticType(bound) => {
                                     if bounds.StaticType.is_none() {
@@ -3430,12 +3337,6 @@ impl ParsedGenerics {
                                     }
                                 }
                                 ParsedTypeBound::Type(_) => {}
-                                ParsedTypeBound::Unknown(_) => {
-                                    errors.error(
-                                        bound,
-                                        "unknown bounds on mask types are not implemented",
-                                    );
-                                }
                             }
                         }
                         bounds.add_implied_bounds();
diff --git a/crates/fayalite-proc-macros-impl/src/lib.rs b/crates/fayalite-proc-macros-impl/src/lib.rs
index 5fe3ae8..6ba177b 100644
--- a/crates/fayalite-proc-macros-impl/src/lib.rs
+++ b/crates/fayalite-proc-macros-impl/src/lib.rs
@@ -72,14 +72,13 @@ mod kw {
     custom_keyword!(cfg);
     custom_keyword!(cfg_attr);
     custom_keyword!(clock_domain);
-    custom_keyword!(cmp_eq);
     custom_keyword!(connect_inexact);
     custom_keyword!(custom_bounds);
     custom_keyword!(flip);
     custom_keyword!(hdl);
     custom_keyword!(hdl_module);
-    custom_keyword!(incomplete_wire);
     custom_keyword!(input);
+    custom_keyword!(incomplete_wire);
     custom_keyword!(instance);
     custom_keyword!(m);
     custom_keyword!(memory);
diff --git a/crates/fayalite/src/array.rs b/crates/fayalite/src/array.rs
index 0d9b63f..f617f91 100644
--- a/crates/fayalite/src/array.rs
+++ b/crates/fayalite/src/array.rs
@@ -2,11 +2,8 @@
 // See Notices.txt for copyright information
 
 use crate::{
-    expr::{
-        ops::{ArrayLiteral, ExprFromIterator, ExprIntoIterator, ExprPartialEq},
-        CastToBits, Expr, HdlPartialEq, ReduceBits, ToExpr,
-    },
-    int::{Bool, DynSize, KnownSize, Size, SizeType, DYN_SIZE},
+    expr::{ops::ArrayIndex, Expr, ToExpr},
+    int::{DynSize, KnownSize, Size, SizeType, DYN_SIZE},
     intern::{Intern, Interned, LazyInterned},
     module::transform::visit::{Fold, Folder, Visit, Visitor},
     source_location::SourceLocation,
@@ -15,7 +12,7 @@ use crate::{
     },
     util::ConstUsize,
 };
-use std::{iter::FusedIterator, ops::Index};
+use std::ops::Index;
 
 #[derive(Copy, Clone, PartialEq, Eq, Hash)]
 pub struct ArrayType<T: Type = CanonicalType, Len: Size = DynSize> {
@@ -151,8 +148,10 @@ impl<T: Type, Len: Size> Type for ArrayType<T, Len> {
         this: Expr<Self>,
         source_location: SourceLocation,
     ) -> Self::MatchVariantsIter {
+        let base = Expr::as_dyn_array(this);
+        let base_ty = Expr::ty(base);
         let _ = source_location;
-        let retval = Vec::from_iter(this);
+        let retval = Vec::from_iter((0..base_ty.len()).map(|i| ArrayIndex::new(base, i).to_expr()));
         std::iter::once(MatchVariantWithoutScope(
             Len::ArrayMatch::<T>::try_from(retval)
                 .ok()
@@ -185,7 +184,9 @@ impl<T: Type, Len: Size> Type for ArrayType<T, Len> {
 
 impl<T: Type, Len: Size> TypeWithDeref for ArrayType<T, Len> {
     fn expr_deref(this: &Expr<Self>) -> &Self::MatchVariant {
-        let retval = Vec::from_iter(*this);
+        let base = Expr::as_dyn_array(*this);
+        let base_ty = Expr::ty(base);
+        let retval = Vec::from_iter((0..base_ty.len()).map(|i| ArrayIndex::new(base, i).to_expr()));
         Interned::into_inner(Intern::intern_sized(
             Len::ArrayMatch::<T>::try_from(retval)
                 .ok()
@@ -217,131 +218,3 @@ impl<T: Type, L: SizeType> Index<L> for ArrayWithoutLen<T> {
         Interned::into_inner(Intern::intern_sized(ArrayType::new(self.element, len)))
     }
 }
-
-impl<Lhs: Type, Rhs: Type, Len: Size> ExprPartialEq<ArrayType<Rhs, Len>> for ArrayType<Lhs, Len>
-where
-    Lhs: ExprPartialEq<Rhs>,
-{
-    fn cmp_eq(lhs: Expr<Self>, rhs: Expr<ArrayType<Rhs, Len>>) -> Expr<Bool> {
-        let lhs_ty = Expr::ty(lhs);
-        let rhs_ty = Expr::ty(rhs);
-        assert_eq!(lhs_ty.len(), rhs_ty.len());
-        lhs.into_iter()
-            .zip(rhs)
-            .map(|(l, r)| l.cmp_eq(r))
-            .collect::<Expr<Array<Bool>>>()
-            .cast_to_bits()
-            .all_one_bits()
-    }
-
-    fn cmp_ne(lhs: Expr<Self>, rhs: Expr<ArrayType<Rhs, Len>>) -> Expr<Bool> {
-        let lhs_ty = Expr::ty(lhs);
-        let rhs_ty = Expr::ty(rhs);
-        assert_eq!(lhs_ty.len(), rhs_ty.len());
-        lhs.into_iter()
-            .zip(rhs)
-            .map(|(l, r)| l.cmp_ne(r))
-            .collect::<Expr<Array<Bool>>>()
-            .cast_to_bits()
-            .any_one_bits()
-    }
-}
-
-impl<T: Type, Len: Size> ExprIntoIterator for ArrayType<T, Len> {
-    type Item = T;
-    type ExprIntoIter = ExprArrayIter<T, Len>;
-
-    fn expr_into_iter(e: Expr<Self>) -> Self::ExprIntoIter {
-        ExprArrayIter {
-            base: e,
-            indexes: 0..Expr::ty(e).len(),
-        }
-    }
-}
-
-#[derive(Clone, Debug)]
-pub struct ExprArrayIter<T: Type, Len: Size> {
-    base: Expr<ArrayType<T, Len>>,
-    indexes: std::ops::Range<usize>,
-}
-
-impl<T: Type, Len: Size> ExprArrayIter<T, Len> {
-    pub fn base(&self) -> Expr<ArrayType<T, Len>> {
-        self.base
-    }
-    pub fn indexes(&self) -> std::ops::Range<usize> {
-        self.indexes.clone()
-    }
-}
-
-impl<T: Type, Len: Size> Iterator for ExprArrayIter<T, Len> {
-    type Item = Expr<T>;
-
-    fn next(&mut self) -> Option<Self::Item> {
-        self.indexes.next().map(|i| self.base[i])
-    }
-
-    fn size_hint(&self) -> (usize, Option<usize>) {
-        self.indexes.size_hint()
-    }
-
-    fn count(self) -> usize {
-        self.indexes.count()
-    }
-
-    fn last(mut self) -> Option<Self::Item> {
-        self.next_back()
-    }
-
-    fn nth(&mut self, n: usize) -> Option<Self::Item> {
-        self.indexes.nth(n).map(|i| self.base[i])
-    }
-
-    fn fold<B, F>(self, init: B, mut f: F) -> B
-    where
-        F: FnMut(B, Self::Item) -> B,
-    {
-        self.indexes.fold(init, |b, i| f(b, self.base[i]))
-    }
-}
-
-impl<T: Type, Len: Size> DoubleEndedIterator for ExprArrayIter<T, Len> {
-    fn next_back(&mut self) -> Option<Self::Item> {
-        self.indexes.next_back().map(|i| self.base[i])
-    }
-
-    fn nth_back(&mut self, n: usize) -> Option<Self::Item> {
-        self.indexes.nth_back(n).map(|i| self.base[i])
-    }
-
-    fn rfold<B, F>(self, init: B, mut f: F) -> B
-    where
-        F: FnMut(B, Self::Item) -> B,
-    {
-        self.indexes.rfold(init, |b, i| f(b, self.base[i]))
-    }
-}
-
-impl<T: Type, Len: Size> ExactSizeIterator for ExprArrayIter<T, Len> {
-    fn len(&self) -> usize {
-        self.indexes.len()
-    }
-}
-
-impl<T: Type, Len: Size> FusedIterator for ExprArrayIter<T, Len> {}
-
-impl<A: StaticType> ExprFromIterator<Expr<A>> for Array<A> {
-    fn expr_from_iter<T: IntoIterator<Item = Expr<A>>>(iter: T) -> Expr<Self> {
-        ArrayLiteral::new(
-            A::TYPE,
-            iter.into_iter().map(|v| Expr::canonical(v)).collect(),
-        )
-        .to_expr()
-    }
-}
-
-impl<'a, A: StaticType> ExprFromIterator<&'a Expr<A>> for Array<A> {
-    fn expr_from_iter<T: IntoIterator<Item = &'a Expr<A>>>(iter: T) -> Expr<Self> {
-        iter.into_iter().copied().collect()
-    }
-}
diff --git a/crates/fayalite/src/bundle.rs b/crates/fayalite/src/bundle.rs
index 9807b92..995510e 100644
--- a/crates/fayalite/src/bundle.rs
+++ b/crates/fayalite/src/bundle.rs
@@ -2,11 +2,7 @@
 // See Notices.txt for copyright information
 
 use crate::{
-    expr::{
-        ops::{ArrayLiteral, BundleLiteral, ExprPartialEq},
-        CastToBits, Expr, ReduceBits, ToExpr,
-    },
-    int::{Bool, DynSize},
+    expr::{ops::BundleLiteral, Expr, ToExpr},
     intern::{Intern, Interned},
     sim::{SimValue, ToSimValue},
     source_location::SourceLocation,
@@ -329,19 +325,7 @@ macro_rules! impl_tuple_builder_fields {
 }
 
 macro_rules! impl_tuples {
-    (
-        [$({
-            #[
-                num = $num:tt,
-                field = $field:ident,
-                ty = $ty_var:ident: $Ty:ident,
-                lhs = $lhs_var:ident: $Lhs:ident,
-                rhs = $rhs_var:ident: $Rhs:ident
-            ]
-            $var:ident: $T:ident
-        })*]
-        []
-    ) => {
+    ([$({#[num = $num:literal, field = $field:ident, ty = $ty_var:ident: $Ty:ident] $var:ident: $T:ident})*] []) => {
         impl_tuple_builder_fields! {
             {}
             [$({
@@ -514,29 +498,6 @@ macro_rules! impl_tuples {
                 Self::into_sim_value(*self, ty)
             }
         }
-        impl<$($Lhs: Type + ExprPartialEq<$Rhs>, $Rhs: Type,)*> ExprPartialEq<($($Rhs,)*)> for ($($Lhs,)*) {
-            fn cmp_eq(lhs: Expr<Self>, rhs: Expr<($($Rhs,)*)>) -> Expr<Bool> {
-                let ($($lhs_var,)*) = *lhs;
-                let ($($rhs_var,)*) = *rhs;
-                ArrayLiteral::<Bool, DynSize>::new(
-                    Bool,
-                    FromIterator::from_iter([$(Expr::canonical(ExprPartialEq::cmp_eq($lhs_var, $rhs_var)),)*]),
-                )
-                .cast_to_bits()
-                .all_one_bits()
-            }
-
-            fn cmp_ne(lhs: Expr<Self>, rhs: Expr<($($Rhs,)*)>) -> Expr<Bool> {
-                let ($($lhs_var,)*) = *lhs;
-                let ($($rhs_var,)*) = *rhs;
-                ArrayLiteral::<Bool, DynSize>::new(
-                    Bool,
-                    FromIterator::from_iter([$(Expr::canonical(ExprPartialEq::cmp_ne($lhs_var, $rhs_var)),)*]),
-                )
-                .cast_to_bits()
-                .any_one_bits()
-            }
-        }
     };
     ([$($lhs:tt)*] [$rhs_first:tt $($rhs:tt)*]) => {
         impl_tuples!([$($lhs)*] []);
@@ -546,18 +507,18 @@ macro_rules! impl_tuples {
 
 impl_tuples! {
     [] [
-        {#[num = 0, field = field_0, ty = ty0: Ty0, lhs = lhs0: Lhs0, rhs = rhs0: Rhs0] v0: T0}
-        {#[num = 1, field = field_1, ty = ty1: Ty1, lhs = lhs1: Lhs1, rhs = rhs1: Rhs1] v1: T1}
-        {#[num = 2, field = field_2, ty = ty2: Ty2, lhs = lhs2: Lhs2, rhs = rhs2: Rhs2] v2: T2}
-        {#[num = 3, field = field_3, ty = ty3: Ty3, lhs = lhs3: Lhs3, rhs = rhs3: Rhs3] v3: T3}
-        {#[num = 4, field = field_4, ty = ty4: Ty4, lhs = lhs4: Lhs4, rhs = rhs4: Rhs4] v4: T4}
-        {#[num = 5, field = field_5, ty = ty5: Ty5, lhs = lhs5: Lhs5, rhs = rhs5: Rhs5] v5: T5}
-        {#[num = 6, field = field_6, ty = ty6: Ty6, lhs = lhs6: Lhs6, rhs = rhs6: Rhs6] v6: T6}
-        {#[num = 7, field = field_7, ty = ty7: Ty7, lhs = lhs7: Lhs7, rhs = rhs7: Rhs7] v7: T7}
-        {#[num = 8, field = field_8, ty = ty8: Ty8, lhs = lhs8: Lhs8, rhs = rhs8: Rhs8] v8: T8}
-        {#[num = 9, field = field_9, ty = ty9: Ty9, lhs = lhs9: Lhs9, rhs = rhs9: Rhs9] v9: T9}
-        {#[num = 10, field = field_10, ty = ty10: Ty10, lhs = lhs10: Lhs10, rhs = rhs10: Rhs10] v10: T10}
-        {#[num = 11, field = field_11, ty = ty11: Ty11, lhs = lhs11: Lhs11, rhs = rhs11: Rhs11] v11: T11}
+        {#[num = 0, field = field_0, ty = ty0: Ty0] v0: T0}
+        {#[num = 1, field = field_1, ty = ty1: Ty1] v1: T1}
+        {#[num = 2, field = field_2, ty = ty2: Ty2] v2: T2}
+        {#[num = 3, field = field_3, ty = ty3: Ty3] v3: T3}
+        {#[num = 4, field = field_4, ty = ty4: Ty4] v4: T4}
+        {#[num = 5, field = field_5, ty = ty5: Ty5] v5: T5}
+        {#[num = 6, field = field_6, ty = ty6: Ty6] v6: T6}
+        {#[num = 7, field = field_7, ty = ty7: Ty7] v7: T7}
+        {#[num = 8, field = field_8, ty = ty8: Ty8] v8: T8}
+        {#[num = 9, field = field_9, ty = ty9: Ty9] v9: T9}
+        {#[num = 10, field = field_10, ty = ty10: Ty10] v10: T10}
+        {#[num = 11, field = field_11, ty = ty11: Ty11] v11: T11}
     ]
 }
 
diff --git a/crates/fayalite/src/enum_.rs b/crates/fayalite/src/enum_.rs
index 70c58c0..2ed0b8e 100644
--- a/crates/fayalite/src/enum_.rs
+++ b/crates/fayalite/src/enum_.rs
@@ -2,10 +2,7 @@
 // See Notices.txt for copyright information
 
 use crate::{
-    expr::{
-        ops::{ExprPartialEq, VariantAccess},
-        Expr, ToExpr,
-    },
+    expr::{ops::VariantAccess, Expr, ToExpr},
     hdl,
     int::Bool,
     intern::{Intern, Interned},
@@ -363,60 +360,6 @@ pub enum HdlOption<T: Type> {
     HdlSome(T),
 }
 
-impl<Lhs: Type + ExprPartialEq<Rhs>, Rhs: Type> ExprPartialEq<HdlOption<Rhs>> for HdlOption<Lhs> {
-    #[hdl]
-    fn cmp_eq(lhs: Expr<Self>, rhs: Expr<HdlOption<Rhs>>) -> Expr<Bool> {
-        #[hdl]
-        let cmp_eq = wire();
-        #[hdl]
-        match lhs {
-            HdlSome(lhs) =>
-            {
-                #[hdl]
-                match rhs {
-                    HdlSome(rhs) => connect(cmp_eq, ExprPartialEq::cmp_eq(lhs, rhs)),
-                    HdlNone => connect(cmp_eq, false),
-                }
-            }
-            HdlNone =>
-            {
-                #[hdl]
-                match rhs {
-                    HdlSome(_) => connect(cmp_eq, false),
-                    HdlNone => connect(cmp_eq, true),
-                }
-            }
-        }
-        cmp_eq
-    }
-
-    #[hdl]
-    fn cmp_ne(lhs: Expr<Self>, rhs: Expr<HdlOption<Rhs>>) -> Expr<Bool> {
-        #[hdl]
-        let cmp_ne = wire();
-        #[hdl]
-        match lhs {
-            HdlSome(lhs) =>
-            {
-                #[hdl]
-                match rhs {
-                    HdlSome(rhs) => connect(cmp_ne, ExprPartialEq::cmp_ne(lhs, rhs)),
-                    HdlNone => connect(cmp_ne, true),
-                }
-            }
-            HdlNone =>
-            {
-                #[hdl]
-                match rhs {
-                    HdlSome(_) => connect(cmp_ne, true),
-                    HdlNone => connect(cmp_ne, false),
-                }
-            }
-        }
-        cmp_ne
-    }
-}
-
 #[allow(non_snake_case)]
 pub fn HdlNone<T: StaticType>() -> Expr<HdlOption<T>> {
     HdlOption[T::TYPE].HdlNone()
diff --git a/crates/fayalite/src/expr.rs b/crates/fayalite/src/expr.rs
index 016ec8e..f0008f4 100644
--- a/crates/fayalite/src/expr.rs
+++ b/crates/fayalite/src/expr.rs
@@ -16,7 +16,6 @@ use crate::{
         transform::visit::{Fold, Folder, Visit, Visitor},
         Instance, ModuleIO,
     },
-    phantom_const::PhantomConst,
     reg::Reg,
     reset::{AsyncReset, Reset, ResetType, ResetTypeDispatch, SyncReset},
     ty::{CanonicalType, StaticType, Type, TypeWithDeref},
@@ -110,7 +109,6 @@ expr_enum! {
         UIntLiteral(Interned<UIntValue>),
         SIntLiteral(Interned<SIntValue>),
         BoolLiteral(bool),
-        PhantomConst(PhantomConst),
         BundleLiteral(ops::BundleLiteral),
         ArrayLiteral(ops::ArrayLiteral<CanonicalType, DynSize>),
         EnumLiteral(ops::EnumLiteral),
@@ -757,27 +755,3 @@ pub fn repeat<T: Type, L: SizeType>(
     )
     .to_expr()
 }
-
-impl<T: ?Sized + crate::phantom_const::PhantomConstValue> ToExpr for PhantomConst<T> {
-    type Type = Self;
-
-    fn to_expr(&self) -> Expr<Self::Type> {
-        Expr {
-            __enum: ExprEnum::PhantomConst(self.canonical_phantom_const()).intern_sized(),
-            __ty: *self,
-            __flow: Flow::Source,
-        }
-    }
-}
-
-impl<T: ?Sized + crate::phantom_const::PhantomConstValue> GetTarget for PhantomConst<T> {
-    fn target(&self) -> Option<Interned<Target>> {
-        None
-    }
-}
-
-impl<T: ?Sized + crate::phantom_const::PhantomConstValue> ToLiteralBits for PhantomConst<T> {
-    fn to_literal_bits(&self) -> Result<Interned<BitSlice>, NotALiteralExpr> {
-        Ok(Interned::default())
-    }
-}
diff --git a/crates/fayalite/src/expr/ops.rs b/crates/fayalite/src/expr/ops.rs
index e794a68..15c195e 100644
--- a/crates/fayalite/src/expr/ops.rs
+++ b/crates/fayalite/src/expr/ops.rs
@@ -11,15 +11,14 @@ use crate::{
             GetTarget, Target, TargetPathArrayElement, TargetPathBundleField,
             TargetPathDynArrayElement, TargetPathElement,
         },
-        CastBitsTo as _, CastTo, CastToBits as _, Expr, ExprEnum, Flow, HdlPartialEq,
-        HdlPartialOrd, NotALiteralExpr, ReduceBits, ToExpr, ToLiteralBits,
+        CastTo, Expr, ExprEnum, Flow, HdlPartialEq, HdlPartialOrd, NotALiteralExpr, ReduceBits,
+        ToExpr, ToLiteralBits,
     },
     int::{
         Bool, BoolOrIntType, DynSize, IntType, KnownSize, SInt, SIntType, SIntValue, Size, UInt,
         UIntType, UIntValue,
     },
     intern::{Intern, Interned},
-    phantom_const::{PhantomConst, PhantomConstValue},
     reset::{
         AsyncReset, Reset, ResetType, ResetTypeDispatch, SyncReset, ToAsyncReset, ToReset,
         ToSyncReset,
@@ -1893,26 +1892,6 @@ impl ExprCastTo<Clock> for Clock {
     }
 }
 
-impl<T: ?Sized + PhantomConstValue> ExprCastTo<()> for PhantomConst<T> {
-    fn cast_to(src: Expr<Self>, to_type: ()) -> Expr<()> {
-        src.cast_to_bits().cast_bits_to(to_type)
-    }
-}
-
-impl<T: ?Sized + PhantomConstValue> ExprCastTo<PhantomConst<T>> for () {
-    fn cast_to(src: Expr<Self>, to_type: PhantomConst<T>) -> Expr<PhantomConst<T>> {
-        src.cast_to_bits().cast_bits_to(to_type)
-    }
-}
-
-impl<T: ?Sized + PhantomConstValue, U: ?Sized + PhantomConstValue> ExprCastTo<PhantomConst<T>>
-    for PhantomConst<U>
-{
-    fn cast_to(src: Expr<Self>, to_type: PhantomConst<T>) -> Expr<PhantomConst<T>> {
-        src.cast_to_bits().cast_bits_to(to_type)
-    }
-}
-
 #[derive(Copy, Clone, PartialEq, Eq, Hash)]
 pub struct FieldAccess<FieldType: Type = CanonicalType> {
     base: Expr<Bundle>,
@@ -2729,47 +2708,3 @@ impl<T: Type> ToExpr for Uninit<T> {
         }
     }
 }
-
-pub trait ExprIntoIterator: Type {
-    type Item: Type;
-    type ExprIntoIter: Iterator<Item = Expr<Self::Item>>;
-
-    fn expr_into_iter(e: Expr<Self>) -> Self::ExprIntoIter;
-}
-
-impl<T: ExprIntoIterator> IntoIterator for Expr<T> {
-    type Item = Expr<T::Item>;
-    type IntoIter = T::ExprIntoIter;
-
-    fn into_iter(self) -> Self::IntoIter {
-        T::expr_into_iter(self)
-    }
-}
-
-impl<T: ExprIntoIterator> IntoIterator for &'_ Expr<T> {
-    type Item = Expr<T::Item>;
-    type IntoIter = T::ExprIntoIter;
-
-    fn into_iter(self) -> Self::IntoIter {
-        T::expr_into_iter(*self)
-    }
-}
-
-impl<T: ExprIntoIterator> IntoIterator for &'_ mut Expr<T> {
-    type Item = Expr<T::Item>;
-    type IntoIter = T::ExprIntoIter;
-
-    fn into_iter(self) -> Self::IntoIter {
-        T::expr_into_iter(*self)
-    }
-}
-
-pub trait ExprFromIterator<A>: Type {
-    fn expr_from_iter<T: IntoIterator<Item = A>>(iter: T) -> Expr<Self>;
-}
-
-impl<This: ExprFromIterator<A>, A> FromIterator<A> for Expr<This> {
-    fn from_iter<T: IntoIterator<Item = A>>(iter: T) -> Self {
-        This::expr_from_iter(iter)
-    }
-}
diff --git a/crates/fayalite/src/firrtl.rs b/crates/fayalite/src/firrtl.rs
index dd5fc2e..ea76cf8 100644
--- a/crates/fayalite/src/firrtl.rs
+++ b/crates/fayalite/src/firrtl.rs
@@ -15,7 +15,7 @@ use crate::{
         target::{
             Target, TargetBase, TargetPathArrayElement, TargetPathBundleField, TargetPathElement,
         },
-        CastBitsTo, Expr, ExprEnum,
+        Expr, ExprEnum,
     },
     formal::FormalKind,
     int::{Bool, DynSize, IntType, SIntValue, UInt, UIntValue},
@@ -447,7 +447,6 @@ impl TypeState {
             CanonicalType::AsyncReset(AsyncReset {}) => "AsyncReset".into(),
             CanonicalType::SyncReset(SyncReset {}) => "UInt<1>".into(),
             CanonicalType::Reset(Reset {}) => "Reset".into(),
-            CanonicalType::PhantomConst(_) => "{}".into(),
         }
     }
 }
@@ -1153,7 +1152,6 @@ impl<'a> Exporter<'a> {
             | CanonicalType::Clock(_)
             | CanonicalType::AsyncReset(_)
             | CanonicalType::Reset(_) => format!("asUInt({value_str})"),
-            CanonicalType::PhantomConst(_) => "UInt<0>(0)".into(),
         }
     }
     fn expr_cast_bits_to_bundle(
@@ -1359,12 +1357,6 @@ impl<'a> Exporter<'a> {
             CanonicalType::AsyncReset(_) => format!("asAsyncReset({value_str})"),
             CanonicalType::SyncReset(_) => value_str,
             CanonicalType::Reset(_) => unreachable!("Reset is not bit castable to"),
-            CanonicalType::PhantomConst(_) => {
-                let retval = self.module.ns.make_new("_cast_bits_to_phantom_const_expr");
-                definitions.add_definition_line(format_args!("{extra_indent}wire {retval}: {{}}"));
-                definitions.add_definition_line(format_args!("{extra_indent}invalidate {retval}"));
-                return retval.to_string();
-            }
         }
     }
     fn expr_unary<T: Type>(
@@ -1403,11 +1395,6 @@ impl<'a> Exporter<'a> {
             ExprEnum::UIntLiteral(literal) => self.uint_literal(&literal),
             ExprEnum::SIntLiteral(literal) => self.sint_literal(&literal),
             ExprEnum::BoolLiteral(literal) => self.bool_literal(literal),
-            ExprEnum::PhantomConst(ty) => self.expr(
-                UInt[0].zero().cast_bits_to(ty.canonical()),
-                definitions,
-                const_ty,
-            ),
             ExprEnum::ArrayLiteral(array_literal) => {
                 self.array_literal_expr(array_literal, definitions, const_ty)
             }
diff --git a/crates/fayalite/src/lib.rs b/crates/fayalite/src/lib.rs
index 512572d..88fe169 100644
--- a/crates/fayalite/src/lib.rs
+++ b/crates/fayalite/src/lib.rs
@@ -96,7 +96,6 @@ pub mod int;
 pub mod intern;
 pub mod memory;
 pub mod module;
-pub mod phantom_const;
 pub mod prelude;
 pub mod reg;
 pub mod reset;
diff --git a/crates/fayalite/src/memory.rs b/crates/fayalite/src/memory.rs
index 1101157..2f0ec47 100644
--- a/crates/fayalite/src/memory.rs
+++ b/crates/fayalite/src/memory.rs
@@ -1082,7 +1082,6 @@ pub fn splat_mask<T: Type>(ty: T, value: Expr<Bool>) -> Expr<AsMask<T>> {
             )
             .to_expr(),
         )),
-        CanonicalType::PhantomConst(_) => Expr::from_canonical(Expr::canonical(().to_expr())),
     }
 }
 
diff --git a/crates/fayalite/src/module.rs b/crates/fayalite/src/module.rs
index 446746a..5a18ac9 100644
--- a/crates/fayalite/src/module.rs
+++ b/crates/fayalite/src/module.rs
@@ -1490,9 +1490,6 @@ impl TargetState {
                         })
                         .collect(),
                 },
-                CanonicalType::PhantomConst(_) => TargetStateInner::Decomposed {
-                    subtargets: HashMap::new(),
-                },
                 CanonicalType::Array(ty) => TargetStateInner::Decomposed {
                     subtargets: (0..ty.len())
                         .map(|index| {
diff --git a/crates/fayalite/src/module/transform/deduce_resets.rs b/crates/fayalite/src/module/transform/deduce_resets.rs
index a70dc33..fe518a5 100644
--- a/crates/fayalite/src/module/transform/deduce_resets.rs
+++ b/crates/fayalite/src/module/transform/deduce_resets.rs
@@ -155,7 +155,6 @@ impl ResetsLayout {
                     CanonicalType::SyncReset(_) => ResetsLayout::SyncReset,
                     CanonicalType::Reset(_) => ResetsLayout::Reset,
                     CanonicalType::Clock(_) => ResetsLayout::NoResets,
-                    CanonicalType::PhantomConst(_) => ResetsLayout::NoResets,
                 }
             }
         }
@@ -408,8 +407,7 @@ impl Resets {
             | CanonicalType::Bool(_)
             | CanonicalType::AsyncReset(_)
             | CanonicalType::SyncReset(_)
-            | CanonicalType::Clock(_)
-            | CanonicalType::PhantomConst(_) => Ok(self.ty),
+            | CanonicalType::Clock(_) => Ok(self.ty),
             CanonicalType::Array(ty) => Ok(CanonicalType::Array(Array::new_dyn(
                 self.array_elements().substituted_type(
                     reset_graph,
@@ -1000,8 +998,7 @@ fn cast_bit_op<P: Pass, T: Type, A: Type>(
                             CanonicalType::Array(_)
                             | CanonicalType::Enum(_)
                             | CanonicalType::Bundle(_)
-                            | CanonicalType::Reset(_)
-                            | CanonicalType::PhantomConst(_) => unreachable!(),
+                            | CanonicalType::Reset(_) => unreachable!(),
                             $(CanonicalType::$Variant(ty) => Expr::expr_enum($arg.cast_to(ty)),)*
                         }
                     };
@@ -1013,7 +1010,6 @@ fn cast_bit_op<P: Pass, T: Type, A: Type>(
                             | CanonicalType::Enum(_)
                             | CanonicalType::Bundle(_)
                             | CanonicalType::Reset(_) => unreachable!(),
-                            CanonicalType::PhantomConst(_) => Expr::expr_enum(arg),
                             $(CanonicalType::$Variant(_) => {
                                 let arg = Expr::<$Variant>::from_canonical(arg);
                                 match_expr_ty!(arg, UInt, SInt, Bool, AsyncReset, SyncReset, Clock)
@@ -1044,7 +1040,6 @@ impl<P: Pass> RunPass<P> for ExprEnum {
             ExprEnum::UIntLiteral(expr) => Ok(expr.run_pass(pass_args)?.map(ExprEnum::from)),
             ExprEnum::SIntLiteral(expr) => Ok(expr.run_pass(pass_args)?.map(ExprEnum::from)),
             ExprEnum::BoolLiteral(expr) => Ok(expr.run_pass(pass_args)?.map(ExprEnum::from)),
-            ExprEnum::PhantomConst(expr) => Ok(expr.run_pass(pass_args)?.map(ExprEnum::from)),
             ExprEnum::BundleLiteral(expr) => Ok(expr.run_pass(pass_args)?.map(ExprEnum::from)),
             ExprEnum::ArrayLiteral(expr) => Ok(expr.run_pass(pass_args)?.map(ExprEnum::from)),
             ExprEnum::EnumLiteral(expr) => Ok(expr.run_pass(pass_args)?.map(ExprEnum::from)),
@@ -1675,8 +1670,7 @@ impl RunPassDispatch for AnyReg {
                 | CanonicalType::Enum(_)
                 | CanonicalType::Bundle(_)
                 | CanonicalType::Reset(_)
-                | CanonicalType::Clock(_)
-                | CanonicalType::PhantomConst(_) => unreachable!(),
+                | CanonicalType::Clock(_) => unreachable!(),
             }
         })
     }
@@ -1775,7 +1769,6 @@ impl_run_pass_copy!([] SVAttributeAnnotation);
 impl_run_pass_copy!([] UInt);
 impl_run_pass_copy!([] usize);
 impl_run_pass_copy!([] FormalKind);
-impl_run_pass_copy!([] PhantomConst);
 
 macro_rules! impl_run_pass_for_struct {
     (
diff --git a/crates/fayalite/src/module/transform/simplify_enums.rs b/crates/fayalite/src/module/transform/simplify_enums.rs
index e8b6168..4eb0d0c 100644
--- a/crates/fayalite/src/module/transform/simplify_enums.rs
+++ b/crates/fayalite/src/module/transform/simplify_enums.rs
@@ -69,8 +69,7 @@ fn contains_any_enum_types(ty: CanonicalType) -> bool {
                 | CanonicalType::AsyncReset(_)
                 | CanonicalType::SyncReset(_)
                 | CanonicalType::Reset(_)
-                | CanonicalType::Clock(_)
-                | CanonicalType::PhantomConst(_) => false,
+                | CanonicalType::Clock(_) => false,
             }
         }
     }
@@ -513,8 +512,7 @@ impl State {
             | CanonicalType::AsyncReset(_)
             | CanonicalType::SyncReset(_)
             | CanonicalType::Reset(_)
-            | CanonicalType::Clock(_)
-            | CanonicalType::PhantomConst(_) => unreachable!(),
+            | CanonicalType::Clock(_) => unreachable!(),
         }
     }
 }
@@ -579,8 +577,7 @@ fn connect_port(
         | (CanonicalType::Clock(_), _)
         | (CanonicalType::AsyncReset(_), _)
         | (CanonicalType::SyncReset(_), _)
-        | (CanonicalType::Reset(_), _)
-        | (CanonicalType::PhantomConst(_), _) => unreachable!(
+        | (CanonicalType::Reset(_), _) => unreachable!(
             "trying to connect memory ports:\n{:?}\n{:?}",
             Expr::ty(lhs),
             Expr::ty(rhs),
@@ -668,7 +665,6 @@ impl Folder for State {
             ExprEnum::UIntLiteral(_)
             | ExprEnum::SIntLiteral(_)
             | ExprEnum::BoolLiteral(_)
-            | ExprEnum::PhantomConst(_)
             | ExprEnum::BundleLiteral(_)
             | ExprEnum::ArrayLiteral(_)
             | ExprEnum::Uninit(_)
@@ -927,8 +923,7 @@ impl Folder for State {
             | CanonicalType::Clock(_)
             | CanonicalType::AsyncReset(_)
             | CanonicalType::SyncReset(_)
-            | CanonicalType::Reset(_)
-            | CanonicalType::PhantomConst(_) => canonical_type.default_fold(self),
+            | CanonicalType::Reset(_) => canonical_type.default_fold(self),
         }
     }
 
diff --git a/crates/fayalite/src/module/transform/simplify_memories.rs b/crates/fayalite/src/module/transform/simplify_memories.rs
index 101385e..e8f9cbf 100644
--- a/crates/fayalite/src/module/transform/simplify_memories.rs
+++ b/crates/fayalite/src/module/transform/simplify_memories.rs
@@ -62,7 +62,6 @@ enum MemSplit {
     Bundle {
         fields: Rc<[MemSplit]>,
     },
-    PhantomConst,
     Single {
         output_mem: Option<Mem>,
         element_type: SingleType,
@@ -77,7 +76,6 @@ impl MemSplit {
     fn mark_changed_element_type(self) -> Self {
         match self {
             MemSplit::Bundle { fields: _ } => self,
-            MemSplit::PhantomConst => self,
             MemSplit::Single {
                 output_mem,
                 element_type,
@@ -99,7 +97,6 @@ impl MemSplit {
                     .map(|field| Self::new(field.ty).mark_changed_element_type())
                     .collect(),
             },
-            CanonicalType::PhantomConst(_) => MemSplit::PhantomConst,
             CanonicalType::Array(ty) => {
                 let element = MemSplit::new(ty.element());
                 if let Self::Single {
@@ -342,7 +339,6 @@ impl SplitMemState<'_, '_> {
                     self.split_state_stack.pop();
                 }
             }
-            MemSplit::PhantomConst => {}
             MemSplit::Single {
                 output_mem,
                 element_type: single_type,
@@ -542,12 +538,7 @@ impl ModuleState {
             };
         loop {
             match input_element_type {
-                CanonicalType::Bundle(_) => {
-                    unreachable!("bundle types are always split")
-                }
-                CanonicalType::PhantomConst(_) => {
-                    unreachable!("PhantomConst are always removed")
-                }
+                CanonicalType::Bundle(_) => unreachable!("bundle types are always split"),
                 CanonicalType::Enum(_)
                     if input_array_types
                         .first()
@@ -752,8 +743,7 @@ impl ModuleState {
                 ..
             }
             | MemSplit::Bundle { .. }
-            | MemSplit::Array { .. }
-            | MemSplit::PhantomConst => {
+            | MemSplit::Array { .. } => {
                 let mut replacement_ports = Vec::with_capacity(input_mem.ports().len());
                 let mut wire_port_rdata = Vec::with_capacity(input_mem.ports().len());
                 let mut wire_port_wdata = Vec::with_capacity(input_mem.ports().len());
diff --git a/crates/fayalite/src/module/transform/visit.rs b/crates/fayalite/src/module/transform/visit.rs
index 662a578..97de4fc 100644
--- a/crates/fayalite/src/module/transform/visit.rs
+++ b/crates/fayalite/src/module/transform/visit.rs
@@ -28,7 +28,6 @@ use crate::{
         NormalModuleBody, ScopedNameId, Stmt, StmtConnect, StmtDeclaration, StmtFormal, StmtIf,
         StmtInstance, StmtMatch, StmtReg, StmtWire,
     },
-    phantom_const::PhantomConst,
     reg::Reg,
     reset::{AsyncReset, Reset, ResetType, SyncReset},
     source_location::SourceLocation,
diff --git a/crates/fayalite/src/phantom_const.rs b/crates/fayalite/src/phantom_const.rs
deleted file mode 100644
index b8f3f09..0000000
--- a/crates/fayalite/src/phantom_const.rs
+++ /dev/null
@@ -1,274 +0,0 @@
-// SPDX-License-Identifier: LGPL-3.0-or-later
-// See Notices.txt for copyright information
-
-use serde::{de::DeserializeOwned, Deserialize, Serialize};
-
-use crate::{
-    intern::{Intern, Interned, InternedCompare, LazyInterned, Memoize},
-    source_location::SourceLocation,
-    ty::{impl_match_variant_as_self, CanonicalType, StaticType, Type, TypeProperties},
-};
-use std::{
-    any::Any,
-    fmt,
-    hash::{Hash, Hasher},
-    marker::PhantomData,
-};
-
-#[derive(Clone)]
-pub struct PhantomConstCanonicalValue {
-    parsed: serde_json::Value,
-    serialized: Interned<str>,
-}
-
-impl PhantomConstCanonicalValue {
-    pub fn from_json_value(parsed: serde_json::Value) -> Self {
-        let serialized = Intern::intern_owned(
-            serde_json::to_string(&parsed)
-                .expect("conversion from json value to text shouldn't fail"),
-        );
-        Self { parsed, serialized }
-    }
-    pub fn as_json_value(&self) -> &serde_json::Value {
-        &self.parsed
-    }
-    pub fn as_str(&self) -> Interned<str> {
-        self.serialized
-    }
-}
-
-impl fmt::Debug for PhantomConstCanonicalValue {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.write_str(&self.serialized)
-    }
-}
-
-impl fmt::Display for PhantomConstCanonicalValue {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.write_str(&self.serialized)
-    }
-}
-
-impl PartialEq for PhantomConstCanonicalValue {
-    fn eq(&self, other: &Self) -> bool {
-        self.serialized == other.serialized
-    }
-}
-
-impl Eq for PhantomConstCanonicalValue {}
-
-impl Hash for PhantomConstCanonicalValue {
-    fn hash<H: Hasher>(&self, state: &mut H) {
-        self.serialized.hash(state);
-    }
-}
-
-impl Serialize for PhantomConstCanonicalValue {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: serde::Serializer,
-    {
-        self.parsed.serialize(serializer)
-    }
-}
-
-impl<'de> Deserialize<'de> for PhantomConstCanonicalValue {
-    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
-    where
-        D: serde::Deserializer<'de>,
-    {
-        Ok(Self::from_json_value(serde_json::Value::deserialize(
-            deserializer,
-        )?))
-    }
-}
-
-pub trait PhantomConstValue: Intern + InternedCompare + Serialize + fmt::Debug {
-    fn deserialize_value<'de, D>(deserializer: D) -> Result<Interned<Self>, D::Error>
-    where
-        D: serde::Deserializer<'de>;
-}
-
-impl<T> PhantomConstValue for T
-where
-    T: ?Sized + Intern + InternedCompare + Serialize + fmt::Debug,
-    Interned<T>: DeserializeOwned,
-{
-    fn deserialize_value<'de, D>(deserializer: D) -> Result<Interned<Self>, D::Error>
-    where
-        D: serde::Deserializer<'de>,
-    {
-        <Interned<T> as Deserialize<'de>>::deserialize(deserializer)
-    }
-}
-
-/// Wrapper type that allows any Rust value to be smuggled as a HDL [`Type`].
-/// This only works for values that can be [serialized][Serialize] to and [deserialized][Deserialize] from [JSON][serde_json].
-pub struct PhantomConst<T: ?Sized + PhantomConstValue = PhantomConstCanonicalValue> {
-    value: LazyInterned<T>,
-}
-
-impl<T: ?Sized + PhantomConstValue> fmt::Debug for PhantomConst<T> {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_tuple("PhantomConst").field(&self.get()).finish()
-    }
-}
-
-impl<T: ?Sized + PhantomConstValue> Clone for PhantomConst<T> {
-    fn clone(&self) -> Self {
-        *self
-    }
-}
-
-impl<T: ?Sized + PhantomConstValue> Copy for PhantomConst<T> {}
-
-impl<T: ?Sized + PhantomConstValue> PartialEq for PhantomConst<T> {
-    fn eq(&self, other: &Self) -> bool {
-        self.get() == other.get()
-    }
-}
-
-impl<T: ?Sized + PhantomConstValue> Eq for PhantomConst<T> {}
-
-impl<T: ?Sized + PhantomConstValue> Hash for PhantomConst<T> {
-    fn hash<H: Hasher>(&self, state: &mut H) {
-        self.get().hash(state);
-    }
-}
-
-struct PhantomConstCanonicalMemoize<T: ?Sized, const IS_FROM_CANONICAL: bool>(PhantomData<T>);
-
-impl<T: ?Sized, const IS_FROM_CANONICAL: bool> Copy
-    for PhantomConstCanonicalMemoize<T, IS_FROM_CANONICAL>
-{
-}
-
-impl<T: ?Sized, const IS_FROM_CANONICAL: bool> Clone
-    for PhantomConstCanonicalMemoize<T, IS_FROM_CANONICAL>
-{
-    fn clone(&self) -> Self {
-        *self
-    }
-}
-
-impl<T: ?Sized, const IS_FROM_CANONICAL: bool> Eq
-    for PhantomConstCanonicalMemoize<T, IS_FROM_CANONICAL>
-{
-}
-
-impl<T: ?Sized, const IS_FROM_CANONICAL: bool> PartialEq
-    for PhantomConstCanonicalMemoize<T, IS_FROM_CANONICAL>
-{
-    fn eq(&self, _other: &Self) -> bool {
-        true
-    }
-}
-
-impl<T: ?Sized, const IS_FROM_CANONICAL: bool> Hash
-    for PhantomConstCanonicalMemoize<T, IS_FROM_CANONICAL>
-{
-    fn hash<H: Hasher>(&self, _state: &mut H) {}
-}
-
-impl<T: ?Sized + PhantomConstValue> Memoize for PhantomConstCanonicalMemoize<T, false> {
-    type Input = Interned<T>;
-    type InputOwned = Interned<T>;
-    type Output = Interned<PhantomConstCanonicalValue>;
-
-    fn inner(self, input: &Self::Input) -> Self::Output {
-        Intern::intern_sized(PhantomConstCanonicalValue::from_json_value(
-            serde_json::to_value(input)
-                .expect("serialization failed when constructing a canonical PhantomConst"),
-        ))
-    }
-}
-
-impl<T: ?Sized + PhantomConstValue> Memoize for PhantomConstCanonicalMemoize<T, true> {
-    type Input = Interned<PhantomConstCanonicalValue>;
-    type InputOwned = Interned<PhantomConstCanonicalValue>;
-    type Output = Interned<T>;
-
-    fn inner(self, input: &Self::Input) -> Self::Output {
-        PhantomConstValue::deserialize_value(input.as_json_value())
-            .expect("deserialization failed ")
-    }
-}
-
-impl<T: ?Sized + PhantomConstValue> PhantomConst<T>
-where
-    Interned<T>: Default,
-{
-    pub const fn default() -> Self {
-        PhantomConst {
-            value: LazyInterned::new_lazy(&Interned::<T>::default),
-        }
-    }
-}
-
-impl<T: ?Sized + PhantomConstValue> PhantomConst<T> {
-    pub fn new(value: Interned<T>) -> Self {
-        Self {
-            value: LazyInterned::Interned(value),
-        }
-    }
-    pub fn get(self) -> Interned<T> {
-        self.value.interned()
-    }
-    pub fn type_properties(self) -> TypeProperties {
-        <()>::TYPE_PROPERTIES
-    }
-    pub fn can_connect(self, other: Self) -> bool {
-        self == other
-    }
-    pub fn canonical_phantom_const(self) -> PhantomConst {
-        if let Some(&retval) = <dyn Any>::downcast_ref::<PhantomConst>(&self) {
-            return retval;
-        }
-        <PhantomConst>::new(
-            PhantomConstCanonicalMemoize::<T, false>(PhantomData).get_owned(self.get()),
-        )
-    }
-    pub fn from_canonical_phantom_const(canonical_type: PhantomConst) -> Self {
-        if let Some(&retval) = <dyn Any>::downcast_ref::<Self>(&canonical_type) {
-            return retval;
-        }
-        Self::new(
-            PhantomConstCanonicalMemoize::<T, true>(PhantomData).get_owned(canonical_type.get()),
-        )
-    }
-}
-
-impl<T: ?Sized + PhantomConstValue> Type for PhantomConst<T> {
-    type BaseType = PhantomConst;
-    type MaskType = ();
-    impl_match_variant_as_self!();
-
-    fn mask_type(&self) -> Self::MaskType {
-        ()
-    }
-
-    fn canonical(&self) -> CanonicalType {
-        CanonicalType::PhantomConst(self.canonical_phantom_const())
-    }
-
-    fn from_canonical(canonical_type: CanonicalType) -> Self {
-        let CanonicalType::PhantomConst(phantom_const) = canonical_type else {
-            panic!("expected PhantomConst");
-        };
-        Self::from_canonical_phantom_const(phantom_const)
-    }
-
-    fn source_location() -> SourceLocation {
-        SourceLocation::builtin()
-    }
-}
-
-impl<T: ?Sized + PhantomConstValue> StaticType for PhantomConst<T>
-where
-    Interned<T>: Default,
-{
-    const TYPE: Self = Self::default();
-    const MASK_TYPE: Self::MaskType = ();
-    const TYPE_PROPERTIES: TypeProperties = <()>::TYPE_PROPERTIES;
-    const MASK_TYPE_PROPERTIES: TypeProperties = <()>::TYPE_PROPERTIES;
-}
diff --git a/crates/fayalite/src/prelude.rs b/crates/fayalite/src/prelude.rs
index 39fa143..9e7a85e 100644
--- a/crates/fayalite/src/prelude.rs
+++ b/crates/fayalite/src/prelude.rs
@@ -26,7 +26,6 @@ pub use crate::{
         annotate, connect, connect_any, incomplete_wire, instance, memory, memory_array,
         memory_with_init, reg_builder, wire, Instance, Module, ModuleBuilder,
     },
-    phantom_const::PhantomConst,
     reg::Reg,
     reset::{AsyncReset, Reset, SyncReset, ToAsyncReset, ToReset, ToSyncReset},
     source_location::SourceLocation,
diff --git a/crates/fayalite/src/sim.rs b/crates/fayalite/src/sim.rs
index 96f6dd9..f630f5a 100644
--- a/crates/fayalite/src/sim.rs
+++ b/crates/fayalite/src/sim.rs
@@ -167,14 +167,6 @@ impl<T: Type> CompiledTypeLayout<T> {
                             body: CompiledTypeLayoutBody::Array { element },
                         }
                     }
-                    CanonicalType::PhantomConst(_) => {
-                        let unit_layout = CompiledTypeLayout::get(());
-                        CompiledTypeLayout {
-                            ty: *input,
-                            layout: unit_layout.layout,
-                            body: unit_layout.body,
-                        }
-                    }
                     CanonicalType::Bundle(bundle) => {
                         let mut layout = TypeLayout::empty();
                         let fields = bundle
@@ -1800,7 +1792,7 @@ impl Compiler {
                 }
                 .into()
             }
-            CanonicalType::Bundle(_) | CanonicalType::PhantomConst(_) => unreachable!(),
+            CanonicalType::Bundle(_) => unreachable!(),
             CanonicalType::AsyncReset(_) => TraceAsyncReset {
                 location: self.make_trace_scalar_helper(
                     instantiated_module,
@@ -2017,13 +2009,6 @@ impl Compiler {
             | CanonicalType::Clock(_) => {
                 self.make_trace_scalar(instantiated_module, target, name, source_location)
             }
-            CanonicalType::PhantomConst(_) => TraceBundle {
-                name,
-                fields: Interned::default(),
-                ty: Bundle::new(Interned::default()),
-                flow: target.flow(),
-            }
-            .into(),
         }
     }
     fn make_trace_decl(
@@ -2484,9 +2469,6 @@ impl Compiler {
                     Expr::field(Expr::<Bundle>::from_canonical(expr.arg()), &field.name)
                 }),
             ),
-            CanonicalType::PhantomConst(_) => {
-                self.compile_cast_aggregate_to_bits(instantiated_module, [])
-            }
         }
     }
     fn compile_cast_bits_to(
@@ -2536,10 +2518,6 @@ impl Compiler {
             CanonicalType::SyncReset(ty) => Expr::canonical(expr.arg().cast_to(ty)),
             CanonicalType::Reset(_) => unreachable!(),
             CanonicalType::Clock(ty) => Expr::canonical(expr.arg().cast_to(ty)),
-            CanonicalType::PhantomConst(ty) => {
-                let _ = self.compile_expr(instantiated_module, Expr::canonical(expr.arg()));
-                Expr::canonical(ty.to_expr())
-            }
         };
         let retval = self.compile_expr(instantiated_module, Expr::canonical(retval));
         self.compiled_expr_to_value(retval, instantiated_module.leaf_module().source_location())
@@ -2589,7 +2567,6 @@ impl Compiler {
                 CanonicalType::SyncReset(_) => false,
                 CanonicalType::Reset(_) => false,
                 CanonicalType::Clock(_) => false,
-                CanonicalType::PhantomConst(_) => unreachable!(),
             };
             let dest_signed = match Expr::ty(expr) {
                 CanonicalType::UInt(_) => false,
@@ -2602,7 +2579,6 @@ impl Compiler {
                 CanonicalType::SyncReset(_) => false,
                 CanonicalType::Reset(_) => false,
                 CanonicalType::Clock(_) => false,
-                CanonicalType::PhantomConst(_) => unreachable!(),
             };
             self.simple_nary_big_expr(instantiated_module, Expr::ty(expr), [arg], |dest, [src]| {
                 match (src_signed, dest_signed) {
@@ -2658,9 +2634,6 @@ impl Compiler {
                     }]
                 })
                 .into(),
-            ExprEnum::PhantomConst(_) => self
-                .compile_aggregate_literal(instantiated_module, Expr::ty(expr), Interned::default())
-                .into(),
             ExprEnum::BundleLiteral(literal) => self
                 .compile_aggregate_literal(
                     instantiated_module,
@@ -3564,7 +3537,6 @@ impl Compiler {
                 CanonicalType::SyncReset(_) => unreachable!(),
                 CanonicalType::Reset(_) => unreachable!(),
                 CanonicalType::Clock(_) => unreachable!(),
-                CanonicalType::PhantomConst(_) => unreachable!("PhantomConst mismatch"),
             }
         }
         let Some(target) = lhs.target() else {
@@ -3929,7 +3901,6 @@ impl Compiler {
                     CanonicalType::SyncReset(_) => false,
                     CanonicalType::Reset(_) => false,
                     CanonicalType::Clock(_) => false,
-                    CanonicalType::PhantomConst(_) => unreachable!(),
                 };
                 let width = data_layout.ty.bit_width();
                 if let Some(MemoryPortReadInsns {
@@ -5938,7 +5909,6 @@ impl SimValue<CanonicalType> {
             CanonicalType::Clock(ty) => {
                 Expr::canonical(Bool::bits_to_expr(Cow::Borrowed(bits)).cast_to(ty))
             }
-            CanonicalType::PhantomConst(ty) => Expr::canonical(ty.to_expr()),
         }
     }
 }
@@ -6342,8 +6312,7 @@ impl ToSimValue<CanonicalType> for bool {
             | CanonicalType::SInt(_)
             | CanonicalType::Array(_)
             | CanonicalType::Enum(_)
-            | CanonicalType::Bundle(_)
-            | CanonicalType::PhantomConst(_) => {
+            | CanonicalType::Bundle(_) => {
                 panic!("can't create SimValue from bool: expected value of type: {ty:?}");
             }
             CanonicalType::Bool(_)
@@ -7008,7 +6977,6 @@ impl SimulationImpl {
                     CanonicalType::SyncReset(_) => false,
                     CanonicalType::Reset(_) => false,
                     CanonicalType::Clock(_) => false,
-                    CanonicalType::PhantomConst(_) => unreachable!(),
                 };
                 match compiled_value.range.len() {
                     TypeLen::A_SMALL_SLOT => read_write_small_scalar(
diff --git a/crates/fayalite/src/ty.rs b/crates/fayalite/src/ty.rs
index 2786782..69080c9 100644
--- a/crates/fayalite/src/ty.rs
+++ b/crates/fayalite/src/ty.rs
@@ -9,10 +9,8 @@ use crate::{
     expr::Expr,
     int::{Bool, SInt, UInt},
     intern::{Intern, Interned},
-    phantom_const::PhantomConst,
     reset::{AsyncReset, Reset, SyncReset},
     source_location::SourceLocation,
-    util::ConstUsize,
 };
 use std::{fmt, hash::Hash, iter::FusedIterator, ops::Index};
 
@@ -37,7 +35,6 @@ pub enum CanonicalType {
     SyncReset(SyncReset),
     Reset(Reset),
     Clock(Clock),
-    PhantomConst(PhantomConst),
 }
 
 impl fmt::Debug for CanonicalType {
@@ -53,7 +50,6 @@ impl fmt::Debug for CanonicalType {
             Self::SyncReset(v) => v.fmt(f),
             Self::Reset(v) => v.fmt(f),
             Self::Clock(v) => v.fmt(f),
-            Self::PhantomConst(v) => v.fmt(f),
         }
     }
 }
@@ -71,7 +67,6 @@ impl CanonicalType {
             CanonicalType::SyncReset(v) => v.type_properties(),
             CanonicalType::Reset(v) => v.type_properties(),
             CanonicalType::Clock(v) => v.type_properties(),
-            CanonicalType::PhantomConst(v) => v.type_properties(),
         }
     }
     pub fn is_passive(self) -> bool {
@@ -148,12 +143,6 @@ impl CanonicalType {
                 };
                 lhs.can_connect(rhs)
             }
-            CanonicalType::PhantomConst(lhs) => {
-                let CanonicalType::PhantomConst(rhs) = rhs else {
-                    return false;
-                };
-                lhs.can_connect(rhs)
-            }
         }
     }
 }
@@ -177,7 +166,7 @@ impl<T: 'static + Send + Sync> MatchVariantAndInactiveScope for MatchVariantWith
 }
 
 pub trait FillInDefaultedGenerics {
-    type Type;
+    type Type: Type;
     fn fill_in_defaulted_generics(self) -> Self::Type;
 }
 
@@ -189,22 +178,6 @@ impl<T: Type> FillInDefaultedGenerics for T {
     }
 }
 
-impl FillInDefaultedGenerics for usize {
-    type Type = usize;
-
-    fn fill_in_defaulted_generics(self) -> Self::Type {
-        self
-    }
-}
-
-impl<const V: usize> FillInDefaultedGenerics for ConstUsize<V> {
-    type Type = ConstUsize<V>;
-
-    fn fill_in_defaulted_generics(self) -> Self::Type {
-        self
-    }
-}
-
 mod sealed {
     pub trait TypeOrDefaultSealed {}
     pub trait BaseTypeSealed {}
@@ -232,7 +205,6 @@ impl_base_type!(AsyncReset);
 impl_base_type!(SyncReset);
 impl_base_type!(Reset);
 impl_base_type!(Clock);
-impl_base_type!(PhantomConst);
 
 impl sealed::BaseTypeSealed for CanonicalType {}
 
@@ -327,7 +299,6 @@ impl Type for CanonicalType {
             CanonicalType::SyncReset(v) => v.mask_type().canonical(),
             CanonicalType::Reset(v) => v.mask_type().canonical(),
             CanonicalType::Clock(v) => v.mask_type().canonical(),
-            CanonicalType::PhantomConst(v) => v.mask_type().canonical(),
         }
     }
     fn canonical(&self) -> CanonicalType {
diff --git a/crates/fayalite/src/util.rs b/crates/fayalite/src/util.rs
index 66fc921..fadc7af 100644
--- a/crates/fayalite/src/util.rs
+++ b/crates/fayalite/src/util.rs
@@ -29,5 +29,4 @@ pub use misc::{
 };
 
 pub mod job_server;
-pub mod prefix_sum;
 pub mod ready_valid;
diff --git a/crates/fayalite/src/util/prefix_sum.rs b/crates/fayalite/src/util/prefix_sum.rs
deleted file mode 100644
index 758d89c..0000000
--- a/crates/fayalite/src/util/prefix_sum.rs
+++ /dev/null
@@ -1,839 +0,0 @@
-// SPDX-License-Identifier: LGPL-3.0-or-later
-// See Notices.txt for copyright information
-
-// code derived from:
-// https://web.archive.org/web/20250303054010/https://git.libre-soc.org/?p=nmutil.git;a=blob;f=src/nmutil/prefix_sum.py;hb=effeb28e5848392adddcdad1f6e7a098f2a44c9c
-
-use crate::intern::{Intern, Interned, Memoize};
-use std::{borrow::Cow, num::NonZeroUsize};
-
-#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
-pub struct PrefixSumOp {
-    pub lhs_index: usize,
-    pub rhs_and_dest_index: NonZeroUsize,
-    pub row: u32,
-}
-
-#[derive(Clone, PartialEq, Eq, Hash, Debug)]
-#[non_exhaustive]
-pub struct DiagramConfig {
-    pub space: Cow<'static, str>,
-    pub vertical_bar: Cow<'static, str>,
-    pub plus: Cow<'static, str>,
-    pub slant: Cow<'static, str>,
-    pub connect: Cow<'static, str>,
-    pub no_connect: Cow<'static, str>,
-    pub padding: usize,
-}
-
-impl DiagramConfig {
-    pub const fn new() -> Self {
-        Self {
-            space: Cow::Borrowed(" "),
-            vertical_bar: Cow::Borrowed("|"),
-            plus: Cow::Borrowed("\u{2295}"), // ⊕
-            slant: Cow::Borrowed(r"\"),
-            connect: Cow::Borrowed("\u{25CF}"), // ●
-            no_connect: Cow::Borrowed("X"),
-            padding: 1,
-        }
-    }
-    pub fn draw(self, ops: impl IntoIterator<Item = PrefixSumOp>, item_count: usize) -> String {
-        #[derive(Copy, Clone, Debug)]
-        struct DiagramCell {
-            slant: bool,
-            plus: bool,
-            tee: bool,
-        }
-        let mut ops_by_row: Vec<Vec<PrefixSumOp>> = Vec::new();
-        let mut last_row = 0;
-        ops.into_iter().for_each(|op| {
-            assert!(
-                op.lhs_index < op.rhs_and_dest_index.get(),
-                "invalid PrefixSumOp! lhs_index must be less \
-                than rhs_and_dest_index: {op:?}",
-            );
-            assert!(
-                op.row >= last_row,
-                "invalid PrefixSumOp! row must \
-                not decrease (row last was: {last_row}): {op:?}",
-            );
-            let ops = if op.row > last_row || ops_by_row.is_empty() {
-                ops_by_row.push(vec![]);
-                ops_by_row.last_mut().expect("just pushed")
-            } else {
-                ops_by_row
-                    .last_mut()
-                    .expect("just checked if ops_by_row is empty")
-            };
-            if let Some(last) = ops.last() {
-                assert!(
-                    op.rhs_and_dest_index < last.rhs_and_dest_index,
-                    "invalid PrefixSumOp! rhs_and_dest_index must strictly \
-                    decrease in a row:\nthis op: {op:?}\nlast op: {last:?}",
-                );
-            }
-            ops.push(op);
-            last_row = op.row;
-        });
-        let blank_row = || {
-            vec![
-                DiagramCell {
-                    slant: false,
-                    plus: false,
-                    tee: false
-                };
-                item_count
-            ]
-        };
-        let mut cells = vec![blank_row()];
-        for ops in ops_by_row {
-            let max_distance = ops
-                .iter()
-                .map(
-                    |&PrefixSumOp {
-                         lhs_index,
-                         rhs_and_dest_index,
-                         ..
-                     }| { rhs_and_dest_index.get() - lhs_index },
-                )
-                .max()
-                .expect("ops is known to be non-empty");
-            cells.extend((0..max_distance).map(|_| blank_row()));
-            for op in ops {
-                let mut y = cells.len() - 1;
-                assert!(
-                    op.rhs_and_dest_index.get() < item_count,
-                    "invalid PrefixSumOp! rhs_and_dest_index must be \
-                    less than item_count ({item_count}): {op:?}",
-                );
-                let mut x = op.rhs_and_dest_index.get();
-                cells[y][x].plus = true;
-                x -= 1;
-                y -= 1;
-                while op.lhs_index < x {
-                    cells[y][x].slant = true;
-                    x -= 1;
-                    y -= 1;
-                }
-                cells[y][x].tee = true;
-            }
-        }
-        let mut retval = String::new();
-        let mut row_text = vec![String::new(); 2 * self.padding + 1];
-        for cells_row in cells {
-            for cell in cells_row {
-                // top padding
-                for y in 0..self.padding {
-                    // top left padding
-                    for x in 0..self.padding {
-                        row_text[y] += if x == y && (cell.plus || cell.slant) {
-                            &self.slant
-                        } else {
-                            &self.space
-                        };
-                    }
-                    // top vertical bar
-                    row_text[y] += &self.vertical_bar;
-                    // top right padding
-                    for _ in 0..self.padding {
-                        row_text[y] += &self.space;
-                    }
-                }
-                // center left padding
-                for _ in 0..self.padding {
-                    row_text[self.padding] += &self.space;
-                }
-                // center
-                row_text[self.padding] += if cell.plus {
-                    &self.plus
-                } else if cell.tee {
-                    &self.connect
-                } else if cell.slant {
-                    &self.no_connect
-                } else {
-                    &self.vertical_bar
-                };
-                // center right padding
-                for _ in 0..self.padding {
-                    row_text[self.padding] += &self.space;
-                }
-                let bottom_padding_start = self.padding + 1;
-                let bottom_padding_last = self.padding * 2;
-                // bottom padding
-                for y in bottom_padding_start..=bottom_padding_last {
-                    // bottom left padding
-                    for _ in 0..self.padding {
-                        row_text[y] += &self.space;
-                    }
-                    // bottom vertical bar
-                    row_text[y] += &self.vertical_bar;
-                    // bottom right padding
-                    for x in bottom_padding_start..=bottom_padding_last {
-                        row_text[y] += if x == y && (cell.tee || cell.slant) {
-                            &self.slant
-                        } else {
-                            &self.space
-                        };
-                    }
-                }
-            }
-            for line in &mut row_text {
-                retval += line.trim_end();
-                retval += "\n";
-                line.clear();
-            }
-        }
-        retval
-    }
-}
-
-impl Default for DiagramConfig {
-    fn default() -> Self {
-        Self::new()
-    }
-}
-
-impl PrefixSumOp {
-    pub fn diagram(ops: impl IntoIterator<Item = Self>, item_count: usize) -> String {
-        Self::diagram_with_config(ops, item_count, DiagramConfig::new())
-    }
-    pub fn diagram_with_config(
-        ops: impl IntoIterator<Item = Self>,
-        item_count: usize,
-        config: DiagramConfig,
-    ) -> String {
-        config.draw(ops, item_count)
-    }
-}
-
-#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
-pub enum PrefixSumAlgorithm {
-    /// Uses the algorithm from:
-    /// https://en.wikipedia.org/wiki/Prefix_sum#Algorithm_1:_Shorter_span,_more_parallel
-    LowLatency,
-    /// Uses the algorithm from:
-    /// https://en.wikipedia.org/wiki/Prefix_sum#Algorithm_2:_Work-efficient
-    WorkEfficient,
-}
-
-impl PrefixSumAlgorithm {
-    fn ops_impl(self, item_count: usize) -> Vec<PrefixSumOp> {
-        let mut retval = Vec::new();
-        let mut distance = 1;
-        let mut row = 0;
-        while distance < item_count {
-            let double_distance = distance
-                .checked_mul(2)
-                .expect("prefix-sum item_count is too big");
-            let (start, step) = match self {
-                Self::LowLatency => (distance, 1),
-                Self::WorkEfficient => (double_distance - 1, double_distance),
-            };
-            for rhs_and_dest_index in (start..item_count).step_by(step).rev() {
-                let Some(rhs_and_dest_index) = NonZeroUsize::new(rhs_and_dest_index) else {
-                    unreachable!();
-                };
-                let lhs_index = rhs_and_dest_index.get() - distance;
-                retval.push(PrefixSumOp {
-                    lhs_index,
-                    rhs_and_dest_index,
-                    row,
-                });
-            }
-            distance = double_distance;
-            row += 1;
-        }
-        match self {
-            Self::LowLatency => {}
-            Self::WorkEfficient => {
-                distance /= 2;
-                while distance >= 1 {
-                    let start = distance
-                        .checked_mul(3)
-                        .expect("prefix-sum item_count is too big")
-                        - 1;
-                    for rhs_and_dest_index in (start..item_count).step_by(distance * 2).rev() {
-                        let Some(rhs_and_dest_index) = NonZeroUsize::new(rhs_and_dest_index) else {
-                            unreachable!();
-                        };
-                        let lhs_index = rhs_and_dest_index.get() - distance;
-                        retval.push(PrefixSumOp {
-                            lhs_index,
-                            rhs_and_dest_index,
-                            row,
-                        });
-                    }
-                    row += 1;
-                    distance /= 2;
-                }
-            }
-        }
-        retval
-    }
-    pub fn ops(self, item_count: usize) -> Interned<[PrefixSumOp]> {
-        #[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
-        struct MyMemoize(PrefixSumAlgorithm);
-        impl Memoize for MyMemoize {
-            type Input = usize;
-            type InputOwned = usize;
-            type Output = Interned<[PrefixSumOp]>;
-
-            fn inner(self, item_count: &Self::Input) -> Self::Output {
-                Intern::intern_owned(self.0.ops_impl(*item_count))
-            }
-        }
-        MyMemoize(self).get_owned(item_count)
-    }
-    pub fn run<T>(self, items: impl IntoIterator<Item = T>, f: impl FnMut(&T, &T) -> T) -> Vec<T> {
-        let mut items = Vec::from_iter(items);
-        self.run_on_slice(&mut items, f);
-        items
-    }
-    pub fn run_on_slice<T>(self, items: &mut [T], mut f: impl FnMut(&T, &T) -> T) -> &mut [T] {
-        self.ops(items.len()).into_iter().for_each(
-            |PrefixSumOp {
-                 lhs_index,
-                 rhs_and_dest_index,
-                 row: _,
-             }| {
-                items[rhs_and_dest_index.get()] =
-                    f(&items[lhs_index], &items[rhs_and_dest_index.get()]);
-            },
-        );
-        items
-    }
-    pub fn filtered_ops(
-        self,
-        item_live_out_flags: impl IntoIterator<Item = bool>,
-    ) -> Vec<PrefixSumOp> {
-        let mut item_live_out_flags = Vec::from_iter(item_live_out_flags);
-        let prefix_sum_ops = self.ops(item_live_out_flags.len());
-        let mut ops_live_flags = vec![false; prefix_sum_ops.len()];
-        for (
-            op_index,
-            &PrefixSumOp {
-                lhs_index,
-                rhs_and_dest_index,
-                row: _,
-            },
-        ) in prefix_sum_ops.iter().enumerate().rev()
-        {
-            let live = item_live_out_flags[rhs_and_dest_index.get()];
-            item_live_out_flags[lhs_index] |= live;
-            ops_live_flags[op_index] = live;
-        }
-        prefix_sum_ops
-            .into_iter()
-            .zip(ops_live_flags)
-            .filter_map(|(op, live)| live.then_some(op))
-            .collect()
-    }
-    pub fn reduce_ops(self, item_count: usize) -> Interned<[PrefixSumOp]> {
-        #[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
-        struct MyMemoize(PrefixSumAlgorithm);
-        impl Memoize for MyMemoize {
-            type Input = usize;
-            type InputOwned = usize;
-            type Output = Interned<[PrefixSumOp]>;
-
-            fn inner(self, item_count: &Self::Input) -> Self::Output {
-                let mut item_live_out_flags = vec![false; *item_count];
-                let Some(last_item_live_out_flag) = item_live_out_flags.last_mut() else {
-                    return Interned::default();
-                };
-                *last_item_live_out_flag = true;
-                Intern::intern_owned(self.0.filtered_ops(item_live_out_flags))
-            }
-        }
-        MyMemoize(self).get_owned(item_count)
-    }
-}
-
-pub fn reduce_ops(item_count: usize) -> Interned<[PrefixSumOp]> {
-    PrefixSumAlgorithm::LowLatency.reduce_ops(item_count)
-}
-
-pub fn reduce<T>(items: impl IntoIterator<Item = T>, mut f: impl FnMut(T, T) -> T) -> Option<T> {
-    let mut items: Vec<_> = items.into_iter().map(Some).collect();
-    for op in reduce_ops(items.len()) {
-        let (Some(lhs), Some(rhs)) = (
-            items[op.lhs_index].take(),
-            items[op.rhs_and_dest_index.get()].take(),
-        ) else {
-            unreachable!();
-        };
-        items[op.rhs_and_dest_index.get()] = Some(f(lhs, rhs));
-    }
-    items.last_mut().and_then(Option::take)
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    fn input_strings() -> [String; 9] {
-        std::array::from_fn(|i| String::from_utf8(vec![b'a' + i as u8]).unwrap())
-    }
-
-    #[test]
-    fn test_prefix_sum_strings() {
-        let input = input_strings();
-        let expected: Vec<String> = input
-            .iter()
-            .scan(String::new(), |l, r| {
-                *l += r;
-                Some(l.clone())
-            })
-            .collect();
-        println!("expected: {expected:?}");
-        assert_eq!(
-            *PrefixSumAlgorithm::WorkEfficient
-                .run_on_slice(&mut input.clone(), |l, r| l.to_string() + r),
-            *expected
-        );
-        assert_eq!(
-            *PrefixSumAlgorithm::LowLatency
-                .run_on_slice(&mut input.clone(), |l, r| l.to_string() + r),
-            *expected
-        );
-    }
-
-    #[test]
-    fn test_reduce_string() {
-        let input = input_strings();
-        let expected = input.clone().into_iter().reduce(|l, r| l + &r);
-        assert_eq!(reduce(input, |l, r| l + &r), expected);
-    }
-
-    fn op(lhs_index: usize, rhs_and_dest_index: usize, row: u32) -> PrefixSumOp {
-        PrefixSumOp {
-            lhs_index,
-            rhs_and_dest_index: NonZeroUsize::new(rhs_and_dest_index).expect("should be non-zero"),
-            row,
-        }
-    }
-
-    #[test]
-    fn test_reduce_ops_9() {
-        let expected = vec![
-            op(7, 8, 0),
-            op(5, 6, 0),
-            op(3, 4, 0),
-            op(1, 2, 0),
-            op(6, 8, 1),
-            op(2, 4, 1),
-            op(4, 8, 2),
-            op(0, 8, 3),
-        ];
-        println!("expected: {expected:#?}");
-        let ops = reduce_ops(9);
-        println!("ops: {ops:#?}");
-        assert_eq!(*ops, *expected);
-    }
-
-    #[test]
-    fn test_reduce_ops_8() {
-        let expected = vec![
-            op(6, 7, 0),
-            op(4, 5, 0),
-            op(2, 3, 0),
-            op(0, 1, 0),
-            op(5, 7, 1),
-            op(1, 3, 1),
-            op(3, 7, 2),
-        ];
-        println!("expected: {expected:#?}");
-        let ops = reduce_ops(8);
-        println!("ops: {ops:#?}");
-        assert_eq!(*ops, *expected);
-    }
-
-    #[test]
-    fn test_count_ones() {
-        for width in 0..=10u32 {
-            for v in 0..1u32 << width {
-                let expected = v.count_ones();
-                assert_eq!(
-                    reduce((0..width).map(|i| (v >> i) & 1), |l, r| l + r).unwrap_or(0),
-                    expected,
-                    "v={v:#X}"
-                );
-            }
-        }
-    }
-
-    #[track_caller]
-    fn test_diagram(ops: impl IntoIterator<Item = PrefixSumOp>, item_count: usize, expected: &str) {
-        let text = PrefixSumOp::diagram_with_config(
-            ops,
-            item_count,
-            DiagramConfig {
-                plus: Cow::Borrowed("@"),
-                ..Default::default()
-            },
-        );
-        println!("text:\n{text}\n");
-        assert_eq!(text, expected);
-    }
-
-    #[test]
-    fn test_work_efficient_diagram_16() {
-        let item_count = 16;
-        test_diagram(
-            PrefixSumAlgorithm::WorkEfficient.ops(item_count),
-            item_count,
-            &r"
- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- ●  |  ●  |  ●  |  ●  |  ●  |  ●  |  ●  |  ●  |
- |\ |  |\ |  |\ |  |\ |  |\ |  |\ |  |\ |  |\ |
- | \|  | \|  | \|  | \|  | \|  | \|  | \|  | \|
- |  @  |  @  |  @  |  @  |  @  |  @  |  @  |  @
- |  |\ |  |  |  |\ |  |  |  |\ |  |  |  |\ |  |
- |  | \|  |  |  | \|  |  |  | \|  |  |  | \|  |
- |  |  X  |  |  |  X  |  |  |  X  |  |  |  X  |
- |  |  |\ |  |  |  |\ |  |  |  |\ |  |  |  |\ |
- |  |  | \|  |  |  | \|  |  |  | \|  |  |  | \|
- |  |  |  @  |  |  |  @  |  |  |  @  |  |  |  @
- |  |  |  |\ |  |  |  |  |  |  |  |\ |  |  |  |
- |  |  |  | \|  |  |  |  |  |  |  | \|  |  |  |
- |  |  |  |  X  |  |  |  |  |  |  |  X  |  |  |
- |  |  |  |  |\ |  |  |  |  |  |  |  |\ |  |  |
- |  |  |  |  | \|  |  |  |  |  |  |  | \|  |  |
- |  |  |  |  |  X  |  |  |  |  |  |  |  X  |  |
- |  |  |  |  |  |\ |  |  |  |  |  |  |  |\ |  |
- |  |  |  |  |  | \|  |  |  |  |  |  |  | \|  |
- |  |  |  |  |  |  X  |  |  |  |  |  |  |  X  |
- |  |  |  |  |  |  |\ |  |  |  |  |  |  |  |\ |
- |  |  |  |  |  |  | \|  |  |  |  |  |  |  | \|
- |  |  |  |  |  |  |  @  |  |  |  |  |  |  |  @
- |  |  |  |  |  |  |  |\ |  |  |  |  |  |  |  |
- |  |  |  |  |  |  |  | \|  |  |  |  |  |  |  |
- |  |  |  |  |  |  |  |  X  |  |  |  |  |  |  |
- |  |  |  |  |  |  |  |  |\ |  |  |  |  |  |  |
- |  |  |  |  |  |  |  |  | \|  |  |  |  |  |  |
- |  |  |  |  |  |  |  |  |  X  |  |  |  |  |  |
- |  |  |  |  |  |  |  |  |  |\ |  |  |  |  |  |
- |  |  |  |  |  |  |  |  |  | \|  |  |  |  |  |
- |  |  |  |  |  |  |  |  |  |  X  |  |  |  |  |
- |  |  |  |  |  |  |  |  |  |  |\ |  |  |  |  |
- |  |  |  |  |  |  |  |  |  |  | \|  |  |  |  |
- |  |  |  |  |  |  |  |  |  |  |  X  |  |  |  |
- |  |  |  |  |  |  |  |  |  |  |  |\ |  |  |  |
- |  |  |  |  |  |  |  |  |  |  |  | \|  |  |  |
- |  |  |  |  |  |  |  |  |  |  |  |  X  |  |  |
- |  |  |  |  |  |  |  |  |  |  |  |  |\ |  |  |
- |  |  |  |  |  |  |  |  |  |  |  |  | \|  |  |
- |  |  |  |  |  |  |  |  |  |  |  |  |  X  |  |
- |  |  |  |  |  |  |  |  |  |  |  |  |  |\ |  |
- |  |  |  |  |  |  |  |  |  |  |  |  |  | \|  |
- |  |  |  |  |  |  |  |  |  |  |  |  |  |  X  |
- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\ |
- |  |  |  |  |  |  |  |  |  |  |  |  |  |  | \|
- |  |  |  |  |  |  |  ●  |  |  |  |  |  |  |  @
- |  |  |  |  |  |  |  |\ |  |  |  |  |  |  |  |
- |  |  |  |  |  |  |  | \|  |  |  |  |  |  |  |
- |  |  |  |  |  |  |  |  X  |  |  |  |  |  |  |
- |  |  |  |  |  |  |  |  |\ |  |  |  |  |  |  |
- |  |  |  |  |  |  |  |  | \|  |  |  |  |  |  |
- |  |  |  |  |  |  |  |  |  X  |  |  |  |  |  |
- |  |  |  |  |  |  |  |  |  |\ |  |  |  |  |  |
- |  |  |  |  |  |  |  |  |  | \|  |  |  |  |  |
- |  |  |  |  |  |  |  |  |  |  X  |  |  |  |  |
- |  |  |  |  |  |  |  |  |  |  |\ |  |  |  |  |
- |  |  |  |  |  |  |  |  |  |  | \|  |  |  |  |
- |  |  |  ●  |  |  |  ●  |  |  |  @  |  |  |  |
- |  |  |  |\ |  |  |  |\ |  |  |  |\ |  |  |  |
- |  |  |  | \|  |  |  | \|  |  |  | \|  |  |  |
- |  |  |  |  X  |  |  |  X  |  |  |  X  |  |  |
- |  |  |  |  |\ |  |  |  |\ |  |  |  |\ |  |  |
- |  |  |  |  | \|  |  |  | \|  |  |  | \|  |  |
- |  ●  |  ●  |  @  |  ●  |  @  |  ●  |  @  |  |
- |  |\ |  |\ |  |\ |  |\ |  |\ |  |\ |  |\ |  |
- |  | \|  | \|  | \|  | \|  | \|  | \|  | \|  |
- |  |  @  |  @  |  @  |  @  |  @  |  @  |  @  |
- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
-"[1..], // trim newline at start
-        );
-    }
-
-    #[test]
-    fn test_low_latency_diagram_16() {
-        let item_count = 16;
-        test_diagram(
-            PrefixSumAlgorithm::LowLatency.ops(item_count),
-            item_count,
-            &r"
- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- ●  ●  ●  ●  ●  ●  ●  ●  ●  ●  ●  ●  ●  ●  ●  |
- |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |
- | \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|
- ●  @  @  @  @  @  @  @  @  @  @  @  @  @  @  @
- |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |  |
- | \| \| \| \| \| \| \| \| \| \| \| \| \| \|  |
- |  X  X  X  X  X  X  X  X  X  X  X  X  X  X  |
- |  |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |
- |  | \| \| \| \| \| \| \| \| \| \| \| \| \| \|
- ●  ●  @  @  @  @  @  @  @  @  @  @  @  @  @  @
- |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |  |  |  |
- | \| \| \| \| \| \| \| \| \| \| \| \|  |  |  |
- |  X  X  X  X  X  X  X  X  X  X  X  X  |  |  |
- |  |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |  |  |
- |  | \| \| \| \| \| \| \| \| \| \| \| \|  |  |
- |  |  X  X  X  X  X  X  X  X  X  X  X  X  |  |
- |  |  |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |  |
- |  |  | \| \| \| \| \| \| \| \| \| \| \| \|  |
- |  |  |  X  X  X  X  X  X  X  X  X  X  X  X  |
- |  |  |  |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |
- |  |  |  | \| \| \| \| \| \| \| \| \| \| \| \|
- ●  ●  ●  ●  @  @  @  @  @  @  @  @  @  @  @  @
- |\ |\ |\ |\ |\ |\ |\ |\ |  |  |  |  |  |  |  |
- | \| \| \| \| \| \| \| \|  |  |  |  |  |  |  |
- |  X  X  X  X  X  X  X  X  |  |  |  |  |  |  |
- |  |\ |\ |\ |\ |\ |\ |\ |\ |  |  |  |  |  |  |
- |  | \| \| \| \| \| \| \| \|  |  |  |  |  |  |
- |  |  X  X  X  X  X  X  X  X  |  |  |  |  |  |
- |  |  |\ |\ |\ |\ |\ |\ |\ |\ |  |  |  |  |  |
- |  |  | \| \| \| \| \| \| \| \|  |  |  |  |  |
- |  |  |  X  X  X  X  X  X  X  X  |  |  |  |  |
- |  |  |  |\ |\ |\ |\ |\ |\ |\ |\ |  |  |  |  |
- |  |  |  | \| \| \| \| \| \| \| \|  |  |  |  |
- |  |  |  |  X  X  X  X  X  X  X  X  |  |  |  |
- |  |  |  |  |\ |\ |\ |\ |\ |\ |\ |\ |  |  |  |
- |  |  |  |  | \| \| \| \| \| \| \| \|  |  |  |
- |  |  |  |  |  X  X  X  X  X  X  X  X  |  |  |
- |  |  |  |  |  |\ |\ |\ |\ |\ |\ |\ |\ |  |  |
- |  |  |  |  |  | \| \| \| \| \| \| \| \|  |  |
- |  |  |  |  |  |  X  X  X  X  X  X  X  X  |  |
- |  |  |  |  |  |  |\ |\ |\ |\ |\ |\ |\ |\ |  |
- |  |  |  |  |  |  | \| \| \| \| \| \| \| \|  |
- |  |  |  |  |  |  |  X  X  X  X  X  X  X  X  |
- |  |  |  |  |  |  |  |\ |\ |\ |\ |\ |\ |\ |\ |
- |  |  |  |  |  |  |  | \| \| \| \| \| \| \| \|
- |  |  |  |  |  |  |  |  @  @  @  @  @  @  @  @
- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
-"[1..], // trim newline at start
-        );
-    }
-
-    #[test]
-    fn test_work_efficient_diagram_9() {
-        let item_count = 9;
-        test_diagram(
-            PrefixSumAlgorithm::WorkEfficient.ops(item_count),
-            item_count,
-            &r"
- |  |  |  |  |  |  |  |  |
- ●  |  ●  |  ●  |  ●  |  |
- |\ |  |\ |  |\ |  |\ |  |
- | \|  | \|  | \|  | \|  |
- |  @  |  @  |  @  |  @  |
- |  |\ |  |  |  |\ |  |  |
- |  | \|  |  |  | \|  |  |
- |  |  X  |  |  |  X  |  |
- |  |  |\ |  |  |  |\ |  |
- |  |  | \|  |  |  | \|  |
- |  |  |  @  |  |  |  @  |
- |  |  |  |\ |  |  |  |  |
- |  |  |  | \|  |  |  |  |
- |  |  |  |  X  |  |  |  |
- |  |  |  |  |\ |  |  |  |
- |  |  |  |  | \|  |  |  |
- |  |  |  |  |  X  |  |  |
- |  |  |  |  |  |\ |  |  |
- |  |  |  |  |  | \|  |  |
- |  |  |  |  |  |  X  |  |
- |  |  |  |  |  |  |\ |  |
- |  |  |  |  |  |  | \|  |
- |  |  |  ●  |  |  |  @  |
- |  |  |  |\ |  |  |  |  |
- |  |  |  | \|  |  |  |  |
- |  |  |  |  X  |  |  |  |
- |  |  |  |  |\ |  |  |  |
- |  |  |  |  | \|  |  |  |
- |  ●  |  ●  |  @  |  ●  |
- |  |\ |  |\ |  |\ |  |\ |
- |  | \|  | \|  | \|  | \|
- |  |  @  |  @  |  @  |  @
- |  |  |  |  |  |  |  |  |
-"[1..], // trim newline at start
-        );
-    }
-
-    #[test]
-    fn test_low_latency_diagram_9() {
-        let item_count = 9;
-        test_diagram(
-            PrefixSumAlgorithm::LowLatency.ops(item_count),
-            item_count,
-            &r"
- |  |  |  |  |  |  |  |  |
- ●  ●  ●  ●  ●  ●  ●  ●  |
- |\ |\ |\ |\ |\ |\ |\ |\ |
- | \| \| \| \| \| \| \| \|
- ●  @  @  @  @  @  @  @  @
- |\ |\ |\ |\ |\ |\ |\ |  |
- | \| \| \| \| \| \| \|  |
- |  X  X  X  X  X  X  X  |
- |  |\ |\ |\ |\ |\ |\ |\ |
- |  | \| \| \| \| \| \| \|
- ●  ●  @  @  @  @  @  @  @
- |\ |\ |\ |\ |\ |  |  |  |
- | \| \| \| \| \|  |  |  |
- |  X  X  X  X  X  |  |  |
- |  |\ |\ |\ |\ |\ |  |  |
- |  | \| \| \| \| \|  |  |
- |  |  X  X  X  X  X  |  |
- |  |  |\ |\ |\ |\ |\ |  |
- |  |  | \| \| \| \| \|  |
- |  |  |  X  X  X  X  X  |
- |  |  |  |\ |\ |\ |\ |\ |
- |  |  |  | \| \| \| \| \|
- ●  |  |  |  @  @  @  @  @
- |\ |  |  |  |  |  |  |  |
- | \|  |  |  |  |  |  |  |
- |  X  |  |  |  |  |  |  |
- |  |\ |  |  |  |  |  |  |
- |  | \|  |  |  |  |  |  |
- |  |  X  |  |  |  |  |  |
- |  |  |\ |  |  |  |  |  |
- |  |  | \|  |  |  |  |  |
- |  |  |  X  |  |  |  |  |
- |  |  |  |\ |  |  |  |  |
- |  |  |  | \|  |  |  |  |
- |  |  |  |  X  |  |  |  |
- |  |  |  |  |\ |  |  |  |
- |  |  |  |  | \|  |  |  |
- |  |  |  |  |  X  |  |  |
- |  |  |  |  |  |\ |  |  |
- |  |  |  |  |  | \|  |  |
- |  |  |  |  |  |  X  |  |
- |  |  |  |  |  |  |\ |  |
- |  |  |  |  |  |  | \|  |
- |  |  |  |  |  |  |  X  |
- |  |  |  |  |  |  |  |\ |
- |  |  |  |  |  |  |  | \|
- |  |  |  |  |  |  |  |  @
- |  |  |  |  |  |  |  |  |
-"[1..], // trim newline at start
-        );
-    }
-
-    #[test]
-    fn test_reduce_diagram_16() {
-        let item_count = 16;
-        test_diagram(
-            reduce_ops(item_count),
-            item_count,
-            &r"
- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- ●  |  ●  |  ●  |  ●  |  ●  |  ●  |  ●  |  ●  |
- |\ |  |\ |  |\ |  |\ |  |\ |  |\ |  |\ |  |\ |
- | \|  | \|  | \|  | \|  | \|  | \|  | \|  | \|
- |  @  |  @  |  @  |  @  |  @  |  @  |  @  |  @
- |  |\ |  |  |  |\ |  |  |  |\ |  |  |  |\ |  |
- |  | \|  |  |  | \|  |  |  | \|  |  |  | \|  |
- |  |  X  |  |  |  X  |  |  |  X  |  |  |  X  |
- |  |  |\ |  |  |  |\ |  |  |  |\ |  |  |  |\ |
- |  |  | \|  |  |  | \|  |  |  | \|  |  |  | \|
- |  |  |  @  |  |  |  @  |  |  |  @  |  |  |  @
- |  |  |  |\ |  |  |  |  |  |  |  |\ |  |  |  |
- |  |  |  | \|  |  |  |  |  |  |  | \|  |  |  |
- |  |  |  |  X  |  |  |  |  |  |  |  X  |  |  |
- |  |  |  |  |\ |  |  |  |  |  |  |  |\ |  |  |
- |  |  |  |  | \|  |  |  |  |  |  |  | \|  |  |
- |  |  |  |  |  X  |  |  |  |  |  |  |  X  |  |
- |  |  |  |  |  |\ |  |  |  |  |  |  |  |\ |  |
- |  |  |  |  |  | \|  |  |  |  |  |  |  | \|  |
- |  |  |  |  |  |  X  |  |  |  |  |  |  |  X  |
- |  |  |  |  |  |  |\ |  |  |  |  |  |  |  |\ |
- |  |  |  |  |  |  | \|  |  |  |  |  |  |  | \|
- |  |  |  |  |  |  |  @  |  |  |  |  |  |  |  @
- |  |  |  |  |  |  |  |\ |  |  |  |  |  |  |  |
- |  |  |  |  |  |  |  | \|  |  |  |  |  |  |  |
- |  |  |  |  |  |  |  |  X  |  |  |  |  |  |  |
- |  |  |  |  |  |  |  |  |\ |  |  |  |  |  |  |
- |  |  |  |  |  |  |  |  | \|  |  |  |  |  |  |
- |  |  |  |  |  |  |  |  |  X  |  |  |  |  |  |
- |  |  |  |  |  |  |  |  |  |\ |  |  |  |  |  |
- |  |  |  |  |  |  |  |  |  | \|  |  |  |  |  |
- |  |  |  |  |  |  |  |  |  |  X  |  |  |  |  |
- |  |  |  |  |  |  |  |  |  |  |\ |  |  |  |  |
- |  |  |  |  |  |  |  |  |  |  | \|  |  |  |  |
- |  |  |  |  |  |  |  |  |  |  |  X  |  |  |  |
- |  |  |  |  |  |  |  |  |  |  |  |\ |  |  |  |
- |  |  |  |  |  |  |  |  |  |  |  | \|  |  |  |
- |  |  |  |  |  |  |  |  |  |  |  |  X  |  |  |
- |  |  |  |  |  |  |  |  |  |  |  |  |\ |  |  |
- |  |  |  |  |  |  |  |  |  |  |  |  | \|  |  |
- |  |  |  |  |  |  |  |  |  |  |  |  |  X  |  |
- |  |  |  |  |  |  |  |  |  |  |  |  |  |\ |  |
- |  |  |  |  |  |  |  |  |  |  |  |  |  | \|  |
- |  |  |  |  |  |  |  |  |  |  |  |  |  |  X  |
- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\ |
- |  |  |  |  |  |  |  |  |  |  |  |  |  |  | \|
- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  @
- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
-"[1..], // trim newline at start
-        );
-    }
-
-    #[test]
-    fn test_reduce_diagram_9() {
-        let item_count = 9;
-        test_diagram(
-            reduce_ops(item_count),
-            item_count,
-            &r"
- |  |  |  |  |  |  |  |  |
- |  ●  |  ●  |  ●  |  ●  |
- |  |\ |  |\ |  |\ |  |\ |
- |  | \|  | \|  | \|  | \|
- |  |  @  |  @  |  @  |  @
- |  |  |\ |  |  |  |\ |  |
- |  |  | \|  |  |  | \|  |
- |  |  |  X  |  |  |  X  |
- |  |  |  |\ |  |  |  |\ |
- |  |  |  | \|  |  |  | \|
- |  |  |  |  @  |  |  |  @
- |  |  |  |  |\ |  |  |  |
- |  |  |  |  | \|  |  |  |
- |  |  |  |  |  X  |  |  |
- |  |  |  |  |  |\ |  |  |
- |  |  |  |  |  | \|  |  |
- |  |  |  |  |  |  X  |  |
- |  |  |  |  |  |  |\ |  |
- |  |  |  |  |  |  | \|  |
- |  |  |  |  |  |  |  X  |
- |  |  |  |  |  |  |  |\ |
- |  |  |  |  |  |  |  | \|
- ●  |  |  |  |  |  |  |  @
- |\ |  |  |  |  |  |  |  |
- | \|  |  |  |  |  |  |  |
- |  X  |  |  |  |  |  |  |
- |  |\ |  |  |  |  |  |  |
- |  | \|  |  |  |  |  |  |
- |  |  X  |  |  |  |  |  |
- |  |  |\ |  |  |  |  |  |
- |  |  | \|  |  |  |  |  |
- |  |  |  X  |  |  |  |  |
- |  |  |  |\ |  |  |  |  |
- |  |  |  | \|  |  |  |  |
- |  |  |  |  X  |  |  |  |
- |  |  |  |  |\ |  |  |  |
- |  |  |  |  | \|  |  |  |
- |  |  |  |  |  X  |  |  |
- |  |  |  |  |  |\ |  |  |
- |  |  |  |  |  | \|  |  |
- |  |  |  |  |  |  X  |  |
- |  |  |  |  |  |  |\ |  |
- |  |  |  |  |  |  | \|  |
- |  |  |  |  |  |  |  X  |
- |  |  |  |  |  |  |  |\ |
- |  |  |  |  |  |  |  | \|
- |  |  |  |  |  |  |  |  @
- |  |  |  |  |  |  |  |  |
-"[1..], // trim newline at start
-        );
-    }
-}
diff --git a/crates/fayalite/tests/module.rs b/crates/fayalite/tests/module.rs
index 49b226a..49f5689 100644
--- a/crates/fayalite/tests/module.rs
+++ b/crates/fayalite/tests/module.rs
@@ -191,14 +191,10 @@ circuit check_array_repeat:
     };
 }
 
-pub trait UnknownTrait {}
-
-impl<T: ?Sized> UnknownTrait for T {}
-
 #[hdl_module(outline_generated)]
 pub fn check_skipped_generics<T, #[hdl(skip)] U, const N: usize, #[hdl(skip)] const M: usize>(v: U)
 where
-    T: StaticType + UnknownTrait,
+    T: StaticType,
     ConstUsize<N>: KnownSize,
     U: std::fmt::Display,
 {
@@ -380,18 +376,18 @@ circuit check_written_inside_both_if_else:
     };
 }
 
-#[hdl(outline_generated, cmp_eq)]
+#[hdl(outline_generated)]
 pub struct TestStruct<T> {
     pub a: T,
     pub b: UInt<8>,
 }
 
-#[hdl(outline_generated, cmp_eq)]
+#[hdl(outline_generated)]
 pub struct TestStruct2 {
     pub v: UInt<8>,
 }
 
-#[hdl(outline_generated, cmp_eq)]
+#[hdl(outline_generated)]
 pub struct TestStruct3 {}
 
 #[hdl_module(outline_generated)]
@@ -4425,125 +4421,3 @@ circuit check_let_patterns:
 ",
     };
 }
-
-#[hdl_module(outline_generated)]
-pub fn check_struct_cmp_eq() {
-    #[hdl]
-    let tuple_lhs: (UInt<1>, SInt<1>, Bool) = m.input();
-    #[hdl]
-    let tuple_rhs: (UInt<1>, SInt<1>, Bool) = m.input();
-    #[hdl]
-    let tuple_cmp_eq: Bool = m.output();
-    connect(tuple_cmp_eq, tuple_lhs.cmp_eq(tuple_rhs));
-    #[hdl]
-    let tuple_cmp_ne: Bool = m.output();
-    connect(tuple_cmp_ne, tuple_lhs.cmp_ne(tuple_rhs));
-
-    #[hdl]
-    let test_struct_lhs: TestStruct<SInt<8>> = m.input();
-    #[hdl]
-    let test_struct_rhs: TestStruct<SInt<8>> = m.input();
-    #[hdl]
-    let test_struct_cmp_eq: Bool = m.output();
-    connect(test_struct_cmp_eq, test_struct_lhs.cmp_eq(test_struct_rhs));
-    #[hdl]
-    let test_struct_cmp_ne: Bool = m.output();
-    connect(test_struct_cmp_ne, test_struct_lhs.cmp_ne(test_struct_rhs));
-
-    #[hdl]
-    let test_struct_2_lhs: TestStruct2 = m.input();
-    #[hdl]
-    let test_struct_2_rhs: TestStruct2 = m.input();
-    #[hdl]
-    let test_struct_2_cmp_eq: Bool = m.output();
-    connect(
-        test_struct_2_cmp_eq,
-        test_struct_2_lhs.cmp_eq(test_struct_2_rhs),
-    );
-    #[hdl]
-    let test_struct_2_cmp_ne: Bool = m.output();
-    connect(
-        test_struct_2_cmp_ne,
-        test_struct_2_lhs.cmp_ne(test_struct_2_rhs),
-    );
-
-    #[hdl]
-    let test_struct_3_lhs: TestStruct3 = m.input();
-    #[hdl]
-    let test_struct_3_rhs: TestStruct3 = m.input();
-    #[hdl]
-    let test_struct_3_cmp_eq: Bool = m.output();
-    connect(
-        test_struct_3_cmp_eq,
-        test_struct_3_lhs.cmp_eq(test_struct_3_rhs),
-    );
-    #[hdl]
-    let test_struct_3_cmp_ne: Bool = m.output();
-    connect(
-        test_struct_3_cmp_ne,
-        test_struct_3_lhs.cmp_ne(test_struct_3_rhs),
-    );
-}
-
-#[test]
-fn test_struct_cmp_eq() {
-    let _n = SourceLocation::normalize_files_for_tests();
-    let m = check_struct_cmp_eq();
-    dbg!(m);
-    #[rustfmt::skip] // work around https://github.com/rust-lang/rustfmt/issues/6161
-    assert_export_firrtl! {
-        m =>
-        "/test/check_struct_cmp_eq.fir": r"FIRRTL version 3.2.0
-circuit check_struct_cmp_eq:
-    type Ty0 = {`0`: UInt<1>, `1`: SInt<1>, `2`: UInt<1>}
-    type Ty1 = {a: SInt<8>, b: UInt<8>}
-    type Ty2 = {v: UInt<8>}
-    type Ty3 = {}
-    module check_struct_cmp_eq: @[module-XXXXXXXXXX.rs 1:1]
-        input tuple_lhs: Ty0 @[module-XXXXXXXXXX.rs 2:1]
-        input tuple_rhs: Ty0 @[module-XXXXXXXXXX.rs 3:1]
-        output tuple_cmp_eq: UInt<1> @[module-XXXXXXXXXX.rs 4:1]
-        output tuple_cmp_ne: UInt<1> @[module-XXXXXXXXXX.rs 6:1]
-        input test_struct_lhs: Ty1 @[module-XXXXXXXXXX.rs 8:1]
-        input test_struct_rhs: Ty1 @[module-XXXXXXXXXX.rs 9:1]
-        output test_struct_cmp_eq: UInt<1> @[module-XXXXXXXXXX.rs 10:1]
-        output test_struct_cmp_ne: UInt<1> @[module-XXXXXXXXXX.rs 12:1]
-        input test_struct_2_lhs: Ty2 @[module-XXXXXXXXXX.rs 14:1]
-        input test_struct_2_rhs: Ty2 @[module-XXXXXXXXXX.rs 15:1]
-        output test_struct_2_cmp_eq: UInt<1> @[module-XXXXXXXXXX.rs 16:1]
-        output test_struct_2_cmp_ne: UInt<1> @[module-XXXXXXXXXX.rs 18:1]
-        input test_struct_3_lhs: Ty3 @[module-XXXXXXXXXX.rs 20:1]
-        input test_struct_3_rhs: Ty3 @[module-XXXXXXXXXX.rs 21:1]
-        output test_struct_3_cmp_eq: UInt<1> @[module-XXXXXXXXXX.rs 22:1]
-        output test_struct_3_cmp_ne: UInt<1> @[module-XXXXXXXXXX.rs 24:1]
-        wire _array_literal_expr: UInt<1>[3]
-        connect _array_literal_expr[0], eq(tuple_lhs.`0`, tuple_rhs.`0`)
-        connect _array_literal_expr[1], eq(tuple_lhs.`1`, tuple_rhs.`1`)
-        connect _array_literal_expr[2], eq(tuple_lhs.`2`, tuple_rhs.`2`)
-        wire _cast_array_to_bits_expr: UInt<1>[3]
-        connect _cast_array_to_bits_expr[0], _array_literal_expr[0]
-        connect _cast_array_to_bits_expr[1], _array_literal_expr[1]
-        connect _cast_array_to_bits_expr[2], _array_literal_expr[2]
-        wire _cast_to_bits_expr: UInt<3>
-        connect _cast_to_bits_expr, cat(_cast_array_to_bits_expr[2], cat(_cast_array_to_bits_expr[1], _cast_array_to_bits_expr[0]))
-        connect tuple_cmp_eq, andr(_cast_to_bits_expr) @[module-XXXXXXXXXX.rs 5:1]
-        wire _array_literal_expr_1: UInt<1>[3]
-        connect _array_literal_expr_1[0], neq(tuple_lhs.`0`, tuple_rhs.`0`)
-        connect _array_literal_expr_1[1], neq(tuple_lhs.`1`, tuple_rhs.`1`)
-        connect _array_literal_expr_1[2], neq(tuple_lhs.`2`, tuple_rhs.`2`)
-        wire _cast_array_to_bits_expr_1: UInt<1>[3]
-        connect _cast_array_to_bits_expr_1[0], _array_literal_expr_1[0]
-        connect _cast_array_to_bits_expr_1[1], _array_literal_expr_1[1]
-        connect _cast_array_to_bits_expr_1[2], _array_literal_expr_1[2]
-        wire _cast_to_bits_expr_1: UInt<3>
-        connect _cast_to_bits_expr_1, cat(_cast_array_to_bits_expr_1[2], cat(_cast_array_to_bits_expr_1[1], _cast_array_to_bits_expr_1[0]))
-        connect tuple_cmp_ne, orr(_cast_to_bits_expr_1) @[module-XXXXXXXXXX.rs 7:1]
-        connect test_struct_cmp_eq, and(eq(test_struct_lhs.a, test_struct_rhs.a), eq(test_struct_lhs.b, test_struct_rhs.b)) @[module-XXXXXXXXXX.rs 11:1]
-        connect test_struct_cmp_ne, or(neq(test_struct_lhs.a, test_struct_rhs.a), neq(test_struct_lhs.b, test_struct_rhs.b)) @[module-XXXXXXXXXX.rs 13:1]
-        connect test_struct_2_cmp_eq, eq(test_struct_2_lhs.v, test_struct_2_rhs.v) @[module-XXXXXXXXXX.rs 17:1]
-        connect test_struct_2_cmp_ne, neq(test_struct_2_lhs.v, test_struct_2_rhs.v) @[module-XXXXXXXXXX.rs 19:1]
-        connect test_struct_3_cmp_eq, UInt<1>(0h1) @[module-XXXXXXXXXX.rs 23:1]
-        connect test_struct_3_cmp_ne, UInt<1>(0h0) @[module-XXXXXXXXXX.rs 25:1]
-",
-    };
-}
diff --git a/crates/fayalite/visit_types.json b/crates/fayalite/visit_types.json
index b284372..3eff1f5 100644
--- a/crates/fayalite/visit_types.json
+++ b/crates/fayalite/visit_types.json
@@ -49,8 +49,7 @@
                 "AsyncReset": "Visible",
                 "SyncReset": "Visible",
                 "Reset": "Visible",
-                "Clock": "Visible",
-                "PhantomConst": "Visible"
+                "Clock": "Visible"
             }
         },
         "Bundle": {
@@ -1263,12 +1262,6 @@
                 "ArrayElement": "Visible",
                 "DynArrayElement": "Visible"
             }
-        },
-        "PhantomConst": {
-            "data": {
-                "$kind": "Opaque"
-            },
-            "generics": "<T: ?Sized + crate::phantom_const::PhantomConstValue>"
         }
     }
 }
\ No newline at end of file