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Rollup merge of #109166 - lcnr:define_opaque_types-explicit, r=oli-obk

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make `define_opaque_types` fully explicit

based on the idea of #108389. Moved `define_opaque_types` into the actual operations, e.g. `eq`, instead of `infcx.at` because normalization doesn't use `define_opaque_types` and even creates it's own `At` with a different `define_opaque_types` internally.

Somewhat surprisingly, coherence actually relies on `DefineOpaqueTypes::Yes` for soundness which was revealed because I've incorrectly used `DefineOpaqueTypes::No` in `equate_impl_headers`. It feels concerning that even though this is the case, we still sometimes use `DefineOpaqueTypes::No` in coherence. I did not look into this as part of this PR as it is purely changing the structure of the code without changing behavior in any way.

r? ```@oli-obk```
This commit is contained in:
Matthias Krüger
2023-03-16 08:57:07 +01:00
committed by GitHub
parent 36b82373e0 d2b7604db9
commit f0205d55ce
33 changed files with 308 additions and 225 deletions
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10
compiler/rustc_infer/src/infer/mod.rs
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@@ -1,3 +1,4 @@
pub use self::at::DefineOpaqueTypes;
pub use self::freshen::TypeFreshener;
pub use self::lexical_region_resolve::RegionResolutionError;
pub use self::LateBoundRegionConversionTime::*;
@@ -730,7 +731,7 @@ impl<'tcx> InferCtxt<'tcx> {
&'a self,
trace: TypeTrace<'tcx>,
param_env: ty::ParamEnv<'tcx>,
define_opaque_types: bool,
define_opaque_types: DefineOpaqueTypes,
) -> CombineFields<'a, 'tcx> {
CombineFields {
infcx: self,
@@ -865,7 +866,7 @@ impl<'tcx> InferCtxt<'tcx> {
T: at::ToTrace<'tcx>,
{
let origin = &ObligationCause::dummy();
self.probe(|_| self.at(origin, param_env).sub(a, b).is_ok())
self.probe(|_| self.at(origin, param_env).sub(DefineOpaqueTypes::No, a, b).is_ok())
}
pub fn can_eq<T>(&self, param_env: ty::ParamEnv<'tcx>, a: T, b: T) -> bool
@@ -873,7 +874,7 @@ impl<'tcx> InferCtxt<'tcx> {
T: at::ToTrace<'tcx>,
{
let origin = &ObligationCause::dummy();
self.probe(|_| self.at(origin, param_env).eq(a, b).is_ok())
self.probe(|_| self.at(origin, param_env).eq(DefineOpaqueTypes::No, a, b).is_ok())
}
#[instrument(skip(self), level = "debug")]
@@ -968,7 +969,8 @@ impl<'tcx> InferCtxt<'tcx> {
let ty::SubtypePredicate { a_is_expected, a, b } =
self.instantiate_binder_with_placeholders(predicate);
let ok = self.at(cause, param_env).sub_exp(a_is_expected, a, b)?;
let ok =
self.at(cause, param_env).sub_exp(DefineOpaqueTypes::No, a_is_expected, a, b)?;
Ok(ok.unit())
}))