Lint inner fn marked as #[test]

src/test/ui/lint/test-inner-fn.rs

@@ -0,0 +1,29 @@
+// Copyright 2018 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.
+
+// compile-flags: --test -D untestable_method
+
+#[test]
+fn foo() {
+    #[test] //~ ERROR cannot test inner function [untestable_method]
+    fn bar() {}
+    bar();
+}
+
+mod x {
+    #[test]
+    fn foo() {
+        #[test] //~ ERROR cannot test inner function [untestable_method]
+        fn bar() {}
+        bar();
+    }
+}
+
+fn main() {}

src/test/ui/lint/test-inner-fn.stderr

@@ -0,0 +1,16 @@
+error: cannot test inner function
+  --> $DIR/test-inner-fn.rs:15:5
+   |
+LL |     #[test] //~ ERROR cannot test inner function [untestable_method]
+   |     ^^^^^^^
+   |
+   = note: requested on the command line with `-D untestable-method`
+
+error: cannot test inner function
+  --> $DIR/test-inner-fn.rs:23:9
+   |
+LL |         #[test] //~ ERROR cannot test inner function [untestable_method]
+   |         ^^^^^^^
+
+error: aborting due to 2 previous errors
+