1 files changed, 20 insertions, 0 deletions
diff --git a/tests/ui/traits/next-solver/coherence/trait_ref_is_knowable-norm-overflow.rs b/tests/ui/traits/next-solver/coherence/trait_ref_is_knowable-norm-overflow.rs
new file mode 100644
index 000000000..af471b5e1
--- /dev/null
+++ b/tests/ui/traits/next-solver/coherence/trait_ref_is_knowable-norm-overflow.rs
@@ -0,0 +1,20 @@
+// compile-flags: -Znext-solver
+
+// Coherence should handle overflow while normalizing for
+// `trait_ref_is_knowable` correctly.
+
+trait Overflow {
+    type Assoc;
+}
+impl<T> Overflow for T {
+    type Assoc = <T as Overflow>::Assoc;
+}
+
+
+trait Trait {}
+impl<T: Copy> Trait for T {}
+struct LocalTy;
+impl Trait for <LocalTy as Overflow>::Assoc {}
+//~^ ERROR conflicting implementations of trait `Trait` for type `<LocalTy as Overflow>::Assoc`
+
+fn main() {}