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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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8
compiler/rustc_ast_pretty/src/pprust/state.rs
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@ -2668,13 +2668,17 @@ impl<'a> State<'a> {
s.print_type(default)
}
}
ast::GenericParamKind::Const { ref ty, kw_span: _ } => {
ast::GenericParamKind::Const { ref ty, kw_span: _, ref default } => {
s.word_space("const");
s.print_ident(param.ident);
s.s.space();
s.word_space(":");
s.print_type(ty);
s.print_type_bounds(":", &param.bounds)
s.print_type_bounds(":", &param.bounds);
if let Some(ref _default) = default {
// FIXME(const_generics_defaults): print the `default` value here
todo!();
}
}
}
});