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resolve_instance: stop relying on Reveal

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This commit is contained in:
lcnr 2024-11-19 20:20:39 +01:00
parent 7a90e84f4d
commit d61effe58f
1 changed files with 17 additions and 17 deletions
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34
compiler/rustc_ty_utils/src/instance.rs
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@ -13,7 +13,7 @@ use rustc_span::sym;
use rustc_trait_selection::traits;
use rustc_type_ir::ClosureKind;
use tracing::debug;
use traits::{Reveal, translate_args};
use traits::translate_args;
use crate::errors::UnexpectedFnPtrAssociatedItem;
@ -133,18 +133,6 @@ fn resolve_associated_item<'tcx>(
bug!("{:?} not found in {:?}", trait_item_id, impl_data.impl_def_id);
});
let typing_env = typing_env.with_reveal_all_normalized(tcx);
let (infcx, param_env) = tcx.infer_ctxt().build_with_typing_env(typing_env);
let args = rcvr_args.rebase_onto(tcx, trait_def_id, impl_data.args);
let args = translate_args(
&infcx,
param_env,
impl_data.impl_def_id,
args,
leaf_def.defining_node,
);
let args = infcx.tcx.erase_regions(args);
// Since this is a trait item, we need to see if the item is either a trait default item
// or a specialization because we can't resolve those unless we can `Reveal::All`.
// NOTE: This should be kept in sync with the similar code in
@ -157,16 +145,28 @@ fn resolve_associated_item<'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 param_env.reveal() == Reveal::All {
!trait_ref.still_further_specializable()
} else {
false
match typing_env.typing_mode {
ty::TypingMode::Coherence
| ty::TypingMode::Analysis { defining_opaque_types: _ } => false,
ty::TypingMode::PostAnalysis => !trait_ref.still_further_specializable(),
}
};
if !eligible {
return Ok(None);
}
let typing_env = typing_env.with_reveal_all_normalized(tcx);
let (infcx, param_env) = tcx.infer_ctxt().build_with_typing_env(typing_env);
let args = rcvr_args.rebase_onto(tcx, trait_def_id, impl_data.args);
let args = translate_args(
&infcx,
param_env,
impl_data.impl_def_id,
args,
leaf_def.defining_node,
);
let args = infcx.tcx.erase_regions(args);
// HACK: We may have overlapping `dyn Trait` built-in impls and
// user-provided blanket impls. Detect that case here, and return
// ambiguity.