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Introduce const Trait (always-const trait bounds)

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This commit is contained in:
León Orell Valerian Liehr
2023-12-18 17:55:55 +01:00
parent 2fe50cd72c
commit 3eb48a35c8
69 changed files with 505 additions and 223 deletions
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3
compiler/rustc_hir_analysis/src/astconv/bounds.rs
View File

@@ -112,6 +112,9 @@ impl<'tcx> dyn AstConv<'tcx> + '_ {
match ast_bound {
hir::GenericBound::Trait(poly_trait_ref, modifier) => {
let (constness, polarity) = match modifier {
hir::TraitBoundModifier::Const => {
(ty::BoundConstness::Const, ty::ImplPolarity::Positive)
}
hir::TraitBoundModifier::MaybeConst => {
(ty::BoundConstness::ConstIfConst, ty::ImplPolarity::Positive)
}

7
compiler/rustc_hir_analysis/src/astconv/mod.rs
View File

@@ -560,11 +560,14 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
inferred_params: vec![],
infer_args,
};
if let ty::BoundConstness::ConstIfConst = constness
if let ty::BoundConstness::Const | ty::BoundConstness::ConstIfConst = constness
&& generics.has_self
&& !tcx.has_attr(def_id, sym::const_trait)
{
let e = tcx.dcx().emit_err(crate::errors::ConstBoundForNonConstTrait { span });
let e = tcx.dcx().emit_err(crate::errors::ConstBoundForNonConstTrait {
span,
modifier: constness.as_str(),
});
arg_count.correct =
Err(GenericArgCountMismatch { reported: Some(e), invalid_args: vec![] });
}