bjoernager/rust
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add test for coinduction in new solver

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This commit is contained in:
lcnr 2023-02-14 10:53:25 +01:00
parent 646e667200
commit 51671cd435
3 changed files with 80 additions and 2 deletions
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10
compiler/rustc_trait_selection/src/solve/mod.rs
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@ -265,12 +265,18 @@ impl<'a, 'tcx> EvalCtxt<'a, 'tcx> {
// call `exists<U> <T as Trait>::Assoc == U` to enable better caching. This goal
// could constrain `U` to `u32` which would cause this check to result in a
// solver cycle.
if cfg!(debug_assertions) && has_changed && !self.in_projection_eq_hack {
if cfg!(debug_assertions)
&& has_changed
&& !self.in_projection_eq_hack
&& !self.search_graph.in_cycle()
{
let mut orig_values = OriginalQueryValues::default();
let canonical_goal = self.infcx.canonicalize_query(goal, &mut orig_values);
let canonical_response =
EvalCtxt::evaluate_canonical_goal(self.tcx(), self.search_graph, canonical_goal)?;
assert!(canonical_response.value.var_values.is_identity());
if !canonical_response.value.var_values.is_identity() {
bug!("unstable result: {goal:?} {canonical_goal:?} {canonical_response:?}");
}
assert_eq!(certainty, canonical_response.value.certainty);
}