bjoernager/rust
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Auto merge of #128776 - Bryanskiy:deep-reject-ctxt, r=lcnr

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Use `DeepRejectCtxt` to quickly reject `ParamEnv` candidates

The description is on the [zulip thread](https://rust-lang.zulipchat.com/#narrow/stream/144729-t-types/topic/.5Basking.20for.20help.5D.20.60DeepRejectCtxt.60.20for.20param.20env.20candidates)

r? `@lcnr`
This commit is contained in:
bors 2024-09-06 19:50:48 +00:00
commit 26b5599e4d
16 changed files with 287 additions and 167 deletions
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11
compiler/rustc_next_trait_solver/src/solve/trait_goals.rs
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@ -2,7 +2,7 @@
use rustc_ast_ir::Movability;
use rustc_type_ir::data_structures::IndexSet;
use rustc_type_ir::fast_reject::{DeepRejectCtxt, TreatParams};
use rustc_type_ir::fast_reject::DeepRejectCtxt;
use rustc_type_ir::inherent::*;
use rustc_type_ir::lang_items::TraitSolverLangItem;
use rustc_type_ir::visit::TypeVisitableExt as _;
@ -47,7 +47,7 @@ where
let cx = ecx.cx();
let impl_trait_ref = cx.impl_trait_ref(impl_def_id);
if !DeepRejectCtxt::new(ecx.cx(), TreatParams::ForLookup)
if !DeepRejectCtxt::relate_rigid_infer(ecx.cx())
.args_may_unify(goal.predicate.trait_ref.args, impl_trait_ref.skip_binder().args)
{
return Err(NoSolution);
@ -124,6 +124,13 @@ where
if trait_clause.def_id() == goal.predicate.def_id()
&& trait_clause.polarity() == goal.predicate.polarity
{
if !DeepRejectCtxt::relate_rigid_rigid(ecx.cx()).args_may_unify(
goal.predicate.trait_ref.args,
trait_clause.skip_binder().trait_ref.args,
) {
return Err(NoSolution);
}
ecx.probe_trait_candidate(source).enter(|ecx| {
let assumption_trait_pred = ecx.instantiate_binder_with_infer(trait_clause);
ecx.eq(