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Rollup merge of #118157 - Nadrieril:never_pat-feature-gate, r=compiler-errors

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Add `never_patterns` feature gate

This PR adds the feature gate and most basic parsing for the experimental `never_patterns` feature. See the tracking issue (https://github.com/rust-lang/rust/issues/118155) for details on the experiment.

`@scottmcm` has agreed to be my lang-team liaison for this experiment.
This commit is contained in:
Matthias Krüger 2023-11-29 12:34:47 +01:00 • committed by GitHub
commit c03f8917ee
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40 changed files with 325 additions and 18 deletions
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4
compiler/rustc_feature/src/unstable.rs
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@ -155,7 +155,7 @@ macro_rules! declare_features {
// was set.
//
// Note that the features are grouped into internal/user-facing and then
// sorted by version inside those groups. This is enforced with tidy.
// sorted alphabetically inside those groups. This is enforced with tidy.
//
// N.B., `tools/tidy/src/features.rs` parses this information directly out of the
// source, so take care when modifying it.
@ -520,6 +520,8 @@ declare_features! (
(unstable, native_link_modifiers_as_needed, "1.53.0", Some(81490), None),
/// Allow negative trait implementations.
(unstable, negative_impls, "1.44.0", Some(68318), None),
/// Allows the `!` pattern.
(incomplete, never_patterns, "CURRENT_RUSTC_VERSION", Some(118155), None),
/// Allows the `!` type. Does not imply 'exhaustive_patterns' (below) any more.
(unstable, never_type, "1.13.0", Some(35121), None),
/// Allows diverging expressions to fall back to `!` rather than `()`.