bjoernager/rust
bjoernager/rust
1
Fork 0
Code Issues Pull requests Activity

also try to normalize opaque types in alias-relate

Browse source 
with this, alias-relate treats all aliases the same way
and it can be used for structural normalization.
This commit is contained in:
lcnr 2024-01-29 17:09:17 +01:00
parent 0a5b998c57
commit bbe2f6c0b2
5 changed files with 27 additions and 98 deletions
Download patch file Download diff file Expand all files Collapse all files

27
compiler/rustc_trait_selection/src/solve/mod.rs
View file

@ -22,8 +22,7 @@ use rustc_middle::traits::solve::{
CanonicalResponse, Certainty, ExternalConstraintsData, Goal, GoalSource, IsNormalizesToHack,
QueryResult, Response,
};
use rustc_middle::traits::Reveal;
use rustc_middle::ty::{self, OpaqueTypeKey, Ty, TyCtxt, UniverseIndex};
use rustc_middle::ty::{self, Ty, TyCtxt, UniverseIndex};
use rustc_middle::ty::{
CoercePredicate, RegionOutlivesPredicate, SubtypePredicate, TypeOutlivesPredicate,
};
@ -292,32 +291,10 @@ impl<'tcx> EvalCtxt<'_, 'tcx> {
return None;
}
let ty::Alias(kind, alias) = *ty.kind() else {
let ty::Alias(_, alias) = *ty.kind() else {
return Some(ty);
};
// We do no always define opaque types eagerly to allow non-defining uses
// in the defining scope. However, if we can unify this opaque to an existing
// opaque, then we should attempt to eagerly reveal the opaque, and we fall
// through.
if let DefineOpaqueTypes::No = define_opaque_types
&& let Reveal::UserFacing = param_env.reveal()
&& let ty::Opaque = kind
&& let Some(def_id) = alias.def_id.as_local()
&& self.can_define_opaque_ty(def_id)
{
if self
.unify_existing_opaque_tys(
param_env,
OpaqueTypeKey { def_id, args: alias.args },
self.next_ty_infer(),
)
.is_empty()
{
return Some(ty);
}
}
match self.commit_if_ok(|this| {
let normalized_ty = this.next_ty_infer();
let normalizes_to_goal = Goal::new(