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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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5
compiler/rustc_ast_lowering/src/lib.rs
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@ -2242,13 +2242,14 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
(hir::ParamName::Plain(param.ident), kind)
}
GenericParamKind::Const { ref ty, kw_span: _ } => {
GenericParamKind::Const { ref ty, kw_span: _, ref default } => {
let ty = self
.with_anonymous_lifetime_mode(AnonymousLifetimeMode::ReportError, |this| {
this.lower_ty(&ty, ImplTraitContext::disallowed())
});
let default = default.as_ref().map(|def| self.lower_anon_const(def));
(hir::ParamName::Plain(param.ident), hir::GenericParamKind::Const { ty })
(hir::ParamName::Plain(param.ident), hir::GenericParamKind::Const { ty, default })
}
};