Test for #2288

Author: catamorphism

src/test/run-pass/issue-2288.rs

@@ -0,0 +1,20 @@
+iface clam<A: copy> {
+  fn chowder(y: A);
+}
+class foo<A: copy> : clam<A> {
+  let x: A;
+  new(b: A) { self.x = b; }
+  fn chowder(y: A) {
+  }
+}
+
+fn f<A: copy>(x: clam<A>, a: A) {
+  x.chowder(a);
+}
+
+fn main() {
+
+  let c = foo(42);
+  let d: clam<int> = c as clam::<int>;
+  f(d, c.x);
+}