1 files changed, 30 insertions, 0 deletions
diff --git a/tests/ui/suggestions/restrict-existing-type-bounds.rs b/tests/ui/suggestions/restrict-existing-type-bounds.rs
new file mode 100644
index 000000000..07712ce0d
--- /dev/null
+++ b/tests/ui/suggestions/restrict-existing-type-bounds.rs
@@ -0,0 +1,30 @@
+pub trait TryAdd<Rhs = Self> {
+    type Error;
+    type Output;
+
+    fn try_add(self, rhs: Rhs) -> Result<Self::Output, Self::Error>;
+}
+
+impl<T: TryAdd> TryAdd for Option<T> {
+    type Error = <T as TryAdd>::Error;
+    type Output = Option<<T as TryAdd>::Output>;
+
+    fn try_add(self, rhs: Self) -> Result<Self::Output, Self::Error> {
+        Ok(self) //~ ERROR mismatched types
+    }
+}
+
+struct Other<A>(A);
+
+struct X;
+
+impl<T: TryAdd<Error = X>> TryAdd for Other<T> {
+    type Error = <T as TryAdd>::Error;
+    type Output = Other<<T as TryAdd>::Output>;
+
+    fn try_add(self, rhs: Self) -> Result<Self::Output, Self::Error> {
+        Ok(self) //~ ERROR mismatched types
+    }
+}
+
+fn main() {}