Add test for issue-44153

Author: JohnTitor

src/test/ui/associated-types/issue-44153.rs

@@ -0,0 +1,19 @@
+pub trait Array {
+    type Element;
+}
+
+pub trait Visit {
+    fn visit() {}
+}
+
+impl Array for () {
+    type Element = ();
+}
+
+impl<'a> Visit for () where
+    (): Array<Element=&'a ()>,
+{}
+
+fn main() {
+    <() as Visit>::visit(); //~ ERROR: type mismatch resolving
+}

src/test/ui/associated-types/issue-44153.stderr

@@ -0,0 +1,16 @@
+error[E0271]: type mismatch resolving `<() as Array>::Element == &()`
+  --> $DIR/issue-44153.rs:18:5
+   |
+LL |     fn visit() {}
+   |     ---------- required by `Visit::visit`
+...
+LL |     <() as Visit>::visit();
+   |     ^^^^^^^^^^^^^^^^^^^^ expected (), found &()
+   |
+   = note: expected type `()`
+              found type `&()`
+   = note: required because of the requirements on the impl of `Visit` for `()`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0271`.