Removed test issue-912.rs

This was marked xfail-test
According to rust's issue #912, this will not be fixed.
There's no point in keeping the test if it is never intended to pass.

src/test/run-pass/issue-912.rs

@@ -1,18 +0,0 @@
-// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-// xfail-test
-fn find<T>(_f: &fn(@T) -> bool, _v: [@T]) {}
-
-pub fn main() {
-    let x = 10, arr = [];
-    find({|f| f.id == x}, arr);
-    arr += [{id: 20}]; // This assigns a type to arr
-}