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Rollup merge of #123512 - Jules-Bertholet:ref-pat-eat-one-layer-2024, r=Nadrieril

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Match ergonomics 2024: Implement eat-one-layer

r? `@Nadrieril`

cc #123076

`@rustbot` label A-edition-2024 A-patterns
This commit is contained in:
Guillaume Gomez 2024-04-16 21:41:24 +02:00 • committed by GitHub
commit 239b3728d5
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14 changed files with 680 additions and 77 deletions
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8
compiler/rustc_ast/src/ast.rs
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@ -36,6 +36,7 @@ use rustc_macros::HashStable_Generic;
use rustc_span::source_map::{respan, Spanned};
use rustc_span::symbol::{kw, sym, Ident, Symbol};
use rustc_span::{ErrorGuaranteed, Span, DUMMY_SP};
use std::cmp;
use std::fmt;
use std::mem;
use thin_vec::{thin_vec, ThinVec};
@ -731,6 +732,13 @@ impl BindingAnnotation {
Self::MUT_REF_MUT => "mut ref mut ",
}
}
pub fn cap_ref_mutability(mut self, mutbl: Mutability) -> Self {
if let ByRef::Yes(old_mutbl) = &mut self.0 {
*old_mutbl = cmp::min(*old_mutbl, mutbl);
}
self
}
}
#[derive(Clone, Encodable, Decodable, Debug)]