Add tests

src/test/compile-fail-fulldeps/proc-macro/error-on-test.rs

+// Copyright 2016 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
+
+#![crate_type = "proc-macro"]
+#![feature(proc_macro)]
+
+extern crate proc_macro;
+
+#[proc_macro_derive(A)]
+//~^ ERROR: `--test` cannot be used with proc-macro crates
+pub fn foo1(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
+    "".parse().unwrap()
+}