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Fully implement ConstArgHasType

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Boxy
2024-06-03 03:11:11 +01:00
parent a9702a6668
commit 8d6705cdb8
7 changed files with 158 additions and 103 deletions
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41
compiler/rustc_trait_selection/src/solve/mod.rs
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@@ -200,30 +200,37 @@ impl<'a, 'tcx> EvalCtxt<'a, InferCtxt<'tcx>> {
) -> QueryResult<'tcx> {
let (ct, ty) = goal.predicate;
// FIXME(BoxyUwU): Really we should not be calling `ct.ty()` for any variant
// other than `ConstKind::Value`. Unfortunately this would require looking in the
// env for any `ConstArgHasType` assumptions for parameters and placeholders. I
// have not yet gotten around to implementing this though.
//
// We do still stall on infer vars though as otherwise a goal like:
// `ConstArgHasType(?x: usize, usize)` can succeed even though it might later
// get unified with some const that is not of type `usize`.
match ct.kind() {
let ct_ty = match ct.kind() {
// FIXME: Ignore effect vars because canonicalization doesn't handle them correctly
// and if we stall on the var then we wind up creating ambiguity errors in a probe
// for this goal which contains an effect var. Which then ends up ICEing.
ty::ConstKind::Infer(ty::InferConst::Var(_)) => {
self.evaluate_added_goals_and_make_canonical_response(Certainty::AMBIGUOUS)
ty::ConstKind::Infer(ty::InferConst::EffectVar(_)) => {
return self.evaluate_added_goals_and_make_canonical_response(Certainty::Yes);
}
ty::ConstKind::Infer(_) => {
return self.evaluate_added_goals_and_make_canonical_response(Certainty::AMBIGUOUS);
}
ty::ConstKind::Error(_) => {
self.evaluate_added_goals_and_make_canonical_response(Certainty::Yes)
return self.evaluate_added_goals_and_make_canonical_response(Certainty::Yes);
}
_ => {
// THISPR
self.eq(goal.param_env, todo!(), ty)?;
self.evaluate_added_goals_and_make_canonical_response(Certainty::Yes)
ty::ConstKind::Unevaluated(uv) => {
self.interner().type_of(uv.def).instantiate(self.interner(), uv.args)
}
}
ty::ConstKind::Expr(_) => unimplemented!(
"`feature(generic_const_exprs)` is not supported in the new trait solver"
),
ty::ConstKind::Param(_) => {
unreachable!("`ConstKind::Param` should have been canonicalized to `Placeholder`")
}
ty::ConstKind::Bound(_, _) => bug!("escaping bound vars in {:?}", ct),
ty::ConstKind::Value(ty, _) => ty,
ty::ConstKind::Placeholder(placeholder) => {
placeholder.find_const_ty_from_env(goal.param_env)
}
};
self.eq(goal.param_env, ct_ty, ty)?;
self.evaluate_added_goals_and_make_canonical_response(Certainty::Yes)
}
}