Prune commentary and stale Rust port notes

macro/src/lib.rs

@@ -18,11 +18,6 @@ struct Input {
 }
 
 struct InputFn {
-    /// Everything written above the `fn` -- in practice a `///` doc
-    /// comment, which is why this exists: `masked_by` and its siblings
-    /// are public API and rustdoc is where their contract is read, so a
-    /// macro that silently rejected `///` sent the explanation into an
-    /// ordinary `//` comment nobody generating docs ever sees.
     attrs: Vec<Attribute>,
     sig: Signature,
     body: Block,
@@ -66,8 +61,6 @@ pub fn widget_trait(input: TokenStream) -> TokenStream {
         fns,
     } = parse_macro_input!(input as Input);
 
-    // The attributes go on the trait's own signature, which is the one
-    // rustdoc renders; the impl gets the bare `fn`.
     let sigs: Vec<_> = fns
         .iter()
         .map(|InputFn { attrs, sig, .. }| quote! { #(#attrs)* #sig })