Extend lang items to assert correct target.

This commit extends the existing lang items functionality to assert
that the `#[lang_item]` attribute is only found on the appropriate item
for any given lang item. That is, language items representing traits
must only ever have their corresponding attribute placed on a trait, for
example.

1 files changed, 18 insertions, 0 deletions

diff --git a/src/test/ui/panic-handler/panic-handler-wrong-location.rs b/src/test/ui/panic-handler/panic-handler-wrong-location.rs
new file mode 100644
index 00000000000..04e02682bc1
--- /dev/null
+++ b/src/test/ui/panic-handler/panic-handler-wrong-location.rs
@@ -0,0 +1,18 @@
+// 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:-C panic=abort
+
+#![no_std]
+#![no_main]
+
+#[panic_handler]
+#[no_mangle]
+static X: u32 = 42;