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add predicate evaluation logic

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This commit is contained in:
Boxy 2023-02-17 09:32:33 +00:00
parent e919d7e348
commit 90c8d6bbe4
9 changed files with 124 additions and 18 deletions
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10
compiler/rustc_hir_analysis/src/impl_wf_check/min_specialization.rs
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@ -496,6 +496,16 @@ fn check_specialization_on<'tcx>(tcx: TyCtxt<'tcx>, predicate: ty::Predicate<'tc
)
.emit();
}
ty::PredicateKind::Clause(ty::Clause::ConstArgHasType(..)) => {
// FIXME(min_specialization), FIXME(const_generics):
// It probably isn't right to allow _every_ `ConstArgHasType` but I am somewhat unsure
// about the actual rules that would be sound. Can't just always error here because otherwise
// std/core doesn't even compile as they have `const N: usize` in some specializing impls.
//
// While we do not support constructs like `<T, const N: T>` there is probably no risk of
// soundness bugs, but when we support generic const parameter types this will need to be
// revisited.
}
_ => {
tcx.sess
.struct_span_err(span, &format!("cannot specialize on predicate `{}`", predicate))