Add test for issue #8587, about calling nested functions of the same name

Author: blake2-ppc

src/test/run-pass/nested-function-names-issue-8587.rs

@@ -0,0 +1,50 @@
+// Copyright 2013 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.
+
+// Make sure nested functions are separate, even if they have
+// equal name.
+//
+// Issue #8587
+
+pub struct X;
+
+impl X {
+    fn f(&self) -> int {
+        #[inline(never)]
+        fn inner() -> int {
+            0
+        }
+        inner()
+    }
+
+    fn g(&self) -> int {
+        #[inline(never)]
+        fn inner_2() -> int {
+            1
+        }
+        inner_2()
+    }
+
+    fn h(&self) -> int {
+        #[inline(never)]
+        fn inner() -> int {
+            2
+        }
+        inner()
+    }
+}
+
+fn main() {
+    let n = X;
+    assert_eq!(n.f(), 0);
+    assert_eq!(n.g(), 1);
+    // This test `h` used to fail.
+    assert_eq!(n.h(), 2);
+}