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macro: ensure that cfg attrs are set for type alias verify generation #1464

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Mar 12, 2025
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macro: ensure that cfg attrs are set for type alias verify generation #1464

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3 changes: 3 additions & 0 deletions macro/src/expand.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1264,6 +1264,7 @@ fn expand_type_alias(alias: &TypeAlias) -> TokenStream {
}

fn expand_type_alias_verify(alias: &TypeAlias, types: &Types) -> TokenStream {
let attrs = &alias.attrs;
let ident = &alias.name.rust;
let type_id = type_id(&alias.name);
let begin_span = alias.type_token.span;
Expand All @@ -1272,12 +1273,14 @@ fn expand_type_alias_verify(alias: &TypeAlias, types: &Types) -> TokenStream {
let end = quote_spanned!(end_span=> >);

let mut verify = quote! {
#attrs
const _: fn() = #begin #ident, #type_id #end;
};

if types.required_trivial.contains_key(&alias.name.rust) {
let begin = quote_spanned!(begin_span=> ::cxx::private::verify_extern_kind::<);
verify.extend(quote! {
#attrs
const _: fn() = #begin #ident, ::cxx::kind::Trivial #end;
});
}
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