fix #[hdl]/#[hdl_module] attributes getting the wrong hygiene when processing #[cfg]s

crates/fayalite-proc-macros-impl/src/lib.rs

@@ -1210,17 +1210,29 @@ fn hdl_main(
     attr: TokenStream,
     item: TokenStream,
 ) -> syn::Result<TokenStream> {
-    let (evaluated_cfgs, attr): (_, TokenStream) = Parser::parse2(
+    fn parse_evaluated_cfgs_attr<R>(
+        input: ParseStream,
+        parse_inner: impl FnOnce(ParseStream) -> syn::Result<R>,
+    ) -> syn::Result<R> {
+        let _: Token![#] = input.parse()?;
+        let bracket_content;
+        bracketed!(bracket_content in input);
+        let _: kw::__evaluated_cfgs = bracket_content.parse()?;
+        let paren_content;
+        parenthesized!(paren_content in bracket_content);
+        parse_inner(&paren_content)
+    }
+    let (evaluated_cfgs, item): (_, TokenStream) = Parser::parse2(
         |input: ParseStream| {
-            if input.peek(Bracket) && input.peek2(kw::__evaluated_cfgs) {
-                let cfgs = input.parse()?;
-                let _: kw::__evaluated_cfgs = input.parse()?;
-                Ok((Some(cfgs), input.parse()?))
+            let peek = input.fork();
+            if parse_evaluated_cfgs_attr(&peek, |_| Ok(())).is_ok() {
+                let evaluated_cfgs = parse_evaluated_cfgs_attr(input, Cfgs::<bool>::parse)?;
+                Ok((Some(evaluated_cfgs), input.parse()?))
             } else {
                 Ok((None, input.parse()?))
             }
         },
-        attr,
+        item,
     )?;
     let cfgs = if let Some(cfgs) = evaluated_cfgs {
         cfgs
@@ -1229,12 +1241,11 @@ fn hdl_main(
         if cfgs.cfgs_list.is_empty() {
             Cfgs::default()
         } else {
-            let key = kw::__evaluated_cfgs::default();
             return Ok(quote! {
                 ::fayalite::__cfg_expansion_helper! {
                     []
                     #cfgs
-                    #[::fayalite::#kw:(#key #attr)] { #item }
+                    {#[::fayalite::#kw(#attr)]} { #item }
                 }
             });
         }