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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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7
compiler/rustc_ast/src/visit.rs
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@ -578,7 +578,12 @@ pub fn walk_generic_param<'a, V: Visitor<'a>>(visitor: &mut V, param: &'a Generi
match param.kind {
GenericParamKind::Lifetime => (),
GenericParamKind::Type { ref default } => walk_list!(visitor, visit_ty, default),
GenericParamKind::Const { ref ty, .. } => visitor.visit_ty(ty),
GenericParamKind::Const { ref ty, ref default, .. } => {
visitor.visit_ty(ty);
if let Some(default) = default {
visitor.visit_anon_const(default);
}
}
}
}