Test that functional struct update exprs get rejected if...

...they require copying noncopyable fields.

src/test/compile-fail/functional-struct-update.rs

@@ -0,0 +1,16 @@
+struct Bar {
+    x: int,
+    drop { io::println("Goodbye, cruel world"); }
+}
+
+struct Foo {
+    x: int,
+    y: Bar
+}
+
+fn main() {
+    let a = Foo { x: 1, y: Bar { x: 5 } };
+    let c = Foo { x: 4, .. a}; //~ ERROR copying a noncopyable value
+    io::println(fmt!("%?", c));
+}
+