Don't treat negative trait predicates as always knowable

2023-07-26 01:35:51 +00:00 · 2023-07-26 01:35:51 +00:00 · 808e174dfc
commit 808e174dfc
parent 864bdf7843
1 changed files with 1 additions and 1 deletions
--- a/compiler/rustc_trait_selection/src/traits/select/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/select/mod.rs
@ -1487,7 +1487,7 @@ fn filter_reservation_impls(
    fn is_knowable<'o>(&mut self, stack: &TraitObligationStack<'o, 'tcx>) -> Result<(), Conflict> {
        debug!("is_knowable(intercrate={:?})", self.is_intercrate());

-        if !self.is_intercrate() || stack.obligation.polarity() == ty::ImplPolarity::Negative {
+        if !self.is_intercrate() {
            return Ok(());
        }