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Rollup merge of #94368 - c410-f3r:metaaaaaaaaaaaaaaaaaaaaaaaaaaa, r=petrochenkov

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[1/2] Implement macro meta-variable expressions

See https://github.com/rust-lang/rust/pull/93545#issuecomment-1050963295

The logic behind `length`, `index` and `count` was removed but the parsing code is still present, i.e., everything is simply ignored like `ignored`.

r? ``@petrochenkov``
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Dylan DPC 2022-03-10 23:12:58 +01:00 • committed by GitHub
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compiler/rustc_feature/src/active.rs
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@ -430,6 +430,8 @@ declare_features! (
(active, link_cfg, "1.14.0", Some(37406), None),
/// Allows using `reason` in lint attributes and the `#[expect(lint)]` lint check.
(active, lint_reasons, "1.31.0", Some(54503), None),
/// Give access to additional metadata about declarative macro meta-variables.
(active, macro_metavar_expr, "1.61.0", Some(83527), None),
/// Allows `#[marker]` on certain traits allowing overlapping implementations.
(active, marker_trait_attr, "1.30.0", Some(29864), None),
/// A minimal, sound subset of specialization intended to be used by the