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Register a dummy candidate for failed structural normalization during candiate assembly

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This commit is contained in:
Michael Goulet 2024-10-14 13:49:31 -04:00
parent 8528387743
commit 0ead25c4a9
11 changed files with 36 additions and 113 deletions
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20
compiler/rustc_next_trait_solver/src/solve/assembly/mod.rs
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@ -6,6 +6,7 @@ use derive_where::derive_where;
use rustc_type_ir::fold::TypeFoldable;
use rustc_type_ir::inherent::*;
use rustc_type_ir::lang_items::TraitSolverLangItem;
use rustc_type_ir::solve::inspect;
use rustc_type_ir::visit::TypeVisitableExt as _;
use rustc_type_ir::{self as ty, Interner, Upcast as _, elaborate};
use tracing::{debug, instrument};
@ -288,6 +289,25 @@ where
let Ok(normalized_self_ty) =
self.structurally_normalize_ty(goal.param_env, goal.predicate.self_ty())
else {
// FIXME: We register a fake candidate when normalization fails so that
// we can point at the reason for *why*. I'm tempted to say that this
// is the wrong way to do this, though.
let result =
self.probe(|&result| inspect::ProbeKind::RigidAlias { result }).enter(|this| {
let normalized_ty = this.next_ty_infer();
let alias_relate_goal = Goal::new(
this.cx(),
goal.param_env,
ty::PredicateKind::AliasRelate(
goal.predicate.self_ty().into(),
normalized_ty.into(),
ty::AliasRelationDirection::Equate,
),
);
this.add_goal(GoalSource::AliasWellFormed, alias_relate_goal);
this.evaluate_added_goals_and_make_canonical_response(Certainty::AMBIGUOUS)
});
assert_eq!(result, Err(NoSolution));
return vec![];
};