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Rollup merge of #151046 - semiopaque-eii-fix, r=jdonszelmann

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compiler: Make Externally Implementable Item (eii) macros "semiopaque"

Otherwise eiis defined by std will produce large amounts of `missing stability attribute` errors. This problem is not eii specific, as can be seen in https://github.com/rust-lang/rust/issues/146993 and which is demonstrated in https://github.com/rust-lang/rust/pull/151022.

As can be seen with

```console
$ git grep rustc_macro_transparency
compiler/rustc_arena/src/lib.rs:#[rustc_macro_transparency = "semiopaque"]
[...]
```

it is very common for macros to use `"semiopaque"`.

r? @jdonszelmann

Tracking issue: https://github.com/rust-lang/rust/issues/125418

Needed for: https://github.com/rust-lang/rust/issues/150588
This commit is contained in:
Jonathan Brouwer 2026-01-14 22:29:59 +01:00 • committed by GitHub
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3
compiler/rustc_builtin_macros/src/eii.rs
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@ -335,6 +335,9 @@ fn generate_attribute_macro_to_implement(
// errors for eii's in std.
macro_attrs.extend_from_slice(attrs_from_decl);
// Avoid "missing stability attribute" errors for eiis in std. See #146993.
macro_attrs.push(ecx.attr_name_value_str(sym::rustc_macro_transparency, sym::semiopaque, span));
// #[builtin_macro(eii_shared_macro)]
macro_attrs.push(ecx.attr_nested_word(sym::rustc_builtin_macro, sym::eii_shared_macro, span));