Add an XFAILed test for blocks that result in functions

Author: brson

src/test/run-pass/expr-block-fn.rs

@@ -0,0 +1,15 @@
+// xfail-boot
+// xfail-stage0
+
+fn test_fn() {
+  type t = fn() -> int;
+  fn ten() -> int {
+    ret 10;
+  }
+  let t res = { ten };
+  check (res() == 10);
+}
+
+fn main() {
+  test_fn();
+}