Generated code spans now point to callsite parameters (where applicable)

src/test/compile-fail/macro-parameter-span.rs

@@ -0,0 +1,23 @@
+// Copyright 2015 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.
+
+macro_rules! foo {
+    ($id: ident) => {
+        $id
+    }
+}
+
+// Testing that the error span points to the parameter 'x' in the callsite,
+// not to the macro variable '$id'
+fn main() {
+    foo!(
+        x //~ ERROR unresolved name `x`
+        );
+}