bjoernager/rust
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Introduce ~const

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- [x] Removed `?const` and change uses of `?const`
 - [x] Added `~const` to the AST. It is gated behind const_trait_impl.
 - [x] Validate `~const` in ast_validation.
 - [ ] Add enum `BoundConstness` to the HIR. (With variants `NotConst` and
 `ConstIfConst` allowing future extensions)
 - [ ] Adjust trait selection and pre-existing code to use `BoundConstness`.
 - [ ] Optional steps (*for this PR, obviously*)
      - [ ] Fix #88155
      - [ ] Do something with constness bounds in chalk
This commit is contained in:
Deadbeef 2021-08-25 11:53:16 +00:00
parent d5cd3205fd
commit 8660832086
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16 changed files with 178 additions and 125 deletions
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2
compiler/rustc_ast_lowering/src/lib.rs
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@ -1414,7 +1414,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
ref ty,
TraitBoundModifier::None | TraitBoundModifier::MaybeConst,
) => Some(this.lower_poly_trait_ref(ty, itctx.reborrow())),
// `?const ?Bound` will cause an error during AST validation
// `~const ?Bound` will cause an error during AST validation
// anyways, so treat it like `?Bound` as compilation proceeds.
GenericBound::Trait(
_,