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trait_sel: only test predicates w/ no substs

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This commit modifies the `substitute_normalize_and_test_predicates`
query, renaming it to `impossible_predicates` and only checking
predicates which do not require substs. By making this change,
polymorphization doesn't have to explicitly support vtables.

Signed-off-by: David Wood <david@davidtw.co>
This commit is contained in:
David Wood 2020-06-22 13:22:45 +01:00
parent 5a20489c5c
commit b7c8b96e66
1 changed files with 1 additions and 1 deletions
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clippy_lints/src/utils/mod.rs
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@ -1346,7 +1346,7 @@ pub fn fn_has_unsatisfiable_preds(cx: &LateContext<'_>, did: DefId) -> bool {
.predicates .predicates
.iter() .iter()
.filter_map(|(p, _)| if p.is_global() { Some(*p) } else { None }); .filter_map(|(p, _)| if p.is_global() { Some(*p) } else { None });
!traits::normalize_and_test_predicates( traits::impossible_predicates(
cx.tcx, cx.tcx,
traits::elaborate_predicates(cx.tcx, predicates) traits::elaborate_predicates(cx.tcx, predicates)
.map(|o| o.predicate) .map(|o| o.predicate)