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first pass at default values for const generics

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- Adds optional default values to const generic parameters in the AST
  and HIR
- Parses these optional default values
- Adds a `const_generics_defaults` feature gate
This commit is contained in:
Julian Knodt 2020-12-31 01:58:27 +01:00 • committed by Rémy Rakic
parent f8ab56bf32
commit 61f33bfd29
20 changed files with 99 additions and 32 deletions
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3
compiler/rustc_feature/src/active.rs
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@ -623,6 +623,9 @@ declare_features! (
/// `:pat2018` and `:pat2021` macro matchers.
(active, edition_macro_pats, "1.51.0", Some(54883), None),
/// Allows const generics to have default values (e.g. `struct Foo<const N: usize = 3>(...);`).
(active, const_generics_defaults, "1.51.0", Some(44580), None),
// -------------------------------------------------------------------------
// feature-group-end: actual feature gates
// -------------------------------------------------------------------------