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introduce a Coerce predicate

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This commit is contained in:
Niko Matsakis 2020-11-21 07:06:16 -05:00 • committed by Mark Rousskov
parent 5a8edc0b76
commit 947c0de028
24 changed files with 153 additions and 2 deletions
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16
compiler/rustc_trait_selection/src/traits/select/mod.rs
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@ -512,6 +512,22 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
}
}
ty::PredicateKind::Coerce(p) => {
let p = bound_predicate.rebind(p);
// Does this code ever run?
match self.infcx.coerce_predicate(&obligation.cause, obligation.param_env, p) {
Some(Ok(InferOk { mut obligations, .. })) => {
self.add_depth(obligations.iter_mut(), obligation.recursion_depth);
self.evaluate_predicates_recursively(
previous_stack,
obligations.into_iter(),
)
}
Some(Err(_)) => Ok(EvaluatedToErr),
None => Ok(EvaluatedToAmbig),
}
}
ty::PredicateKind::WellFormed(arg) => match wf::obligations(
self.infcx,
obligation.param_env,