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expand: Leave traces when expanding cfg attributes

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This commit is contained in:
Vadim Petrochenkov 2025-03-22 21:42:34 +03:00
parent 65899c06f1
commit 92d802eda6
24 changed files with 88 additions and 108 deletions
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12
compiler/rustc_feature/src/builtin_attrs.rs
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@ -760,10 +760,14 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
template!(Word, List: r#""...""#), DuplicatesOk,
EncodeCrossCrate::Yes, INTERNAL_UNSTABLE
),
// Trace that is left when a `cfg_attr` attribute is expanded.
// The attribute is not gated, to avoid stability errors, but it cannot be used in stable or
// unstable code directly because `sym::cfg_attr_trace` is not a valid identifier, it can only
// be generated by the compiler.
// Traces that are left when `cfg` and `cfg_attr` attributes are expanded.
// The attributes are not gated, to avoid stability errors, but they cannot be used in stable
// or unstable code directly because `sym::cfg_(attr_)trace` are not valid identifiers, they
// can only be generated by the compiler.
ungated!(
cfg_trace, Normal, template!(Word /* irrelevant */), DuplicatesOk,
EncodeCrossCrate::No
),
ungated!(
cfg_attr_trace, Normal, template!(Word /* irrelevant */), DuplicatesOk,
EncodeCrossCrate::No