1 files changed, 43 insertions, 0 deletions
diff --git a/tests/ui/const-generics/defaults/trait_objects.rs b/tests/ui/const-generics/defaults/trait_objects.rs
new file mode 100644
index 000000000..750e40313
--- /dev/null
+++ b/tests/ui/const-generics/defaults/trait_objects.rs
@@ -0,0 +1,43 @@
+// run-pass
+trait Trait<const N: u8 = 12> {
+    fn uwu(&self) -> u8 {
+        N
+    }
+}
+
+impl Trait for u32 {}
+
+impl Trait<12> for u64 {
+    fn uwu(&self) -> u8 {
+        *self as u8
+    }
+}
+
+fn foo(arg: &dyn Trait) -> u8 {
+    arg.uwu()
+}
+
+trait Traitor<const N: u8 = 1, const M: u8 = N> {
+    fn owo(&self) -> u8 {
+        M
+    }
+}
+
+impl Traitor<2> for bool { }
+impl Traitor for u8 {
+    fn owo(&self) -> u8 {
+        *self
+    }
+}
+
+fn bar<const N: u8>(arg: &dyn Traitor<N>) -> u8 {
+    arg.owo()
+}
+
+fn main() {
+    assert_eq!(foo(&10_u32), 12);
+    assert_eq!(foo(&3_u64), 3);
+
+    assert_eq!(bar(&true), 2);
+    assert_eq!(bar(&1_u8), 1);
+}