1 files changed, 23 insertions, 0 deletions
diff --git a/src/test/ui/associated-types/issue-41868.rs b/src/test/ui/associated-types/issue-41868.rs
new file mode 100644
index 000000000..52bbd1f5d
--- /dev/null
+++ b/src/test/ui/associated-types/issue-41868.rs
@@ -0,0 +1,23 @@
+// check-pass
+
+// Defaulted assoc. types should normalize properly in impls that don't
+// override them.
+
+#![feature(associated_type_defaults)]
+
+pub struct Foo;
+
+pub trait CanDecode: Sized {
+    type Output = Self;
+    fn read(rdr: &mut Foo) -> Option<Self::Output>;
+}
+
+impl CanDecode for u8 {
+    fn read(rdr: &mut Foo) -> Option<Self::Output> { Some(42) }
+}
+
+impl CanDecode for u16 {
+    fn read(rdr: &mut Foo) -> Option<u16> { Some(17) }
+}
+
+fn main() {}