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traits::project: yeet ParamEnv::reveal

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This commit is contained in:
lcnr 2024-10-31 12:06:19 +01:00
parent 4d296eabe4
commit 84295b917d
1 changed files with 16 additions and 13 deletions
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29
compiler/rustc_trait_selection/src/traits/project.rs
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@ -16,7 +16,7 @@
use rustc_middle::ty::fast_reject::DeepRejectCtxt;
use rustc_middle::ty::fold::TypeFoldable;
use rustc_middle::ty::visit::{MaxUniverse, TypeVisitable, TypeVisitableExt};
use rustc_middle::ty::{self, Term, Ty, TyCtxt, Upcast};
use rustc_middle::ty::{self, Term, Ty, TyCtxt, TypingMode, Upcast};
use rustc_middle::{bug, span_bug};
use rustc_span::symbol::sym;
use tracing::{debug, instrument};
@ -975,18 +975,21 @@ fn assemble_candidates_from_impls<'cx, 'tcx>(
// and the obligation is monomorphic, otherwise passes such as
// transmute checking and polymorphic MIR optimizations could
// get a result which isn't correct for all monomorphizations.
if obligation.param_env.reveal() == Reveal::All {
// NOTE(eddyb) inference variables can resolve to parameters, so
// assume `poly_trait_ref` isn't monomorphic, if it contains any.
let poly_trait_ref = selcx.infcx.resolve_vars_if_possible(trait_ref);
!poly_trait_ref.still_further_specializable()
} else {
debug!(
assoc_ty = ?selcx.tcx().def_path_str(node_item.item.def_id),
?obligation.predicate,
"assemble_candidates_from_impls: not eligible due to default",
);
false
match selcx.infcx.typing_mode(obligation.param_env) {
TypingMode::Coherence | TypingMode::Analysis { .. } => {
debug!(
assoc_ty = ?selcx.tcx().def_path_str(node_item.item.def_id),
?obligation.predicate,
"assemble_candidates_from_impls: not eligible due to default",
);
false
}
TypingMode::PostAnalysis => {
// NOTE(eddyb) inference variables can resolve to parameters, so
// assume `poly_trait_ref` isn't monomorphic, if it contains any.
let poly_trait_ref = selcx.infcx.resolve_vars_if_possible(trait_ref);
!poly_trait_ref.still_further_specializable()
}
}
}
}