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/ops.rs b/crates/fayalite/src/expr/ops.rs
index c502fd5..15c195e 100644
--- a/crates/fayalite/src/expr/ops.rs
+++ b/crates/fayalite/src/expr/ops.rs
@@ -2708,47 +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/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]
-",
-    };
-}