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Make hidden type registration opt-in, so that each site can be reviewed on its own and we have the right defaults for trait solvers

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This commit is contained in:
Oli Scherer
2023-02-10 16:42:53 +00:00
parent bda32a4023
commit 88a7b6803b
15 changed files with 51 additions and 26 deletions
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8
compiler/rustc_trait_selection/src/traits/select/mod.rs
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@@ -1752,7 +1752,6 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
});
self.infcx
.at(&obligation.cause, obligation.param_env)
.define_opaque_types(false)
.sup(ty::Binder::dummy(placeholder_trait_ref), trait_bound)
.map(|InferOk { obligations: _, value: () }| {
// This method is called within a probe, so we can't have
@@ -1815,7 +1814,6 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
let is_match = self
.infcx
.at(&obligation.cause, obligation.param_env)
.define_opaque_types(false)
.sup(obligation.predicate, infer_projection)
.map_or(false, |InferOk { obligations, value: () }| {
self.evaluate_predicates_recursively(
@@ -2507,7 +2505,6 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
let InferOk { obligations, .. } = self
.infcx
.at(&cause, obligation.param_env)
.define_opaque_types(false)
.eq(placeholder_obligation_trait_ref, impl_trait_ref)
.map_err(|e| {
debug!("match_impl: failed eq_trait_refs due to `{}`", e.to_string(self.tcx()))
@@ -2558,11 +2555,6 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
) -> Result<Vec<PredicateObligation<'tcx>>, ()> {
self.infcx
.at(&obligation.cause, obligation.param_env)
// We don't want predicates for opaque types to just match all other types,
// if there is an obligation on the opaque type, then that obligation must be met
// opaquely. Otherwise we'd match any obligation to the opaque type and then error
// out later.
.define_opaque_types(false)
.sup(obligation.predicate.to_poly_trait_ref(), poly_trait_ref)
.map(|InferOk { obligations, .. }| obligations)
.map_err(|_| ())