Extend the solution to encompass HRTB

src/test/run-pass/associated-types-duplicate-binding-in-env-hrtb.rs

@@ -0,0 +1,9 @@
+fn foo<T>(t: T) -> i32
+    where T : for<'a> Fn(&'a u8) -> i32,
+          T : for<'b> Fn(&'b u8) -> i32,
+{
+    t(&3)
+}
+
+fn main() {
+}