Add a regression test for issue-70292

Author: JohnTitor

src/test/ui/associated-type-bounds/issue-70292.rs

@@ -0,0 +1,21 @@
+// check-pass
+
+#![feature(associated_type_bounds)]
+
+fn foo<F>(_: F)
+where
+    F: for<'a> Trait<Output: 'a>,
+{
+}
+
+trait Trait {
+    type Output;
+}
+
+impl<T> Trait for T {
+    type Output = ();
+}
+
+fn main() {
+    foo(());
+}