Update tests to match the messages

src/test/compile-fail/dupe-symbols-1.rs

@@ -17,5 +17,5 @@ pub fn a() {
 
 #[export_name="fail"]
 pub fn b() {
-//~^ symbol `fail` already exists
+//~^ symbol `fail` is already defined
 }

src/test/compile-fail/dupe-symbols-2.rs

@@ -20,6 +20,6 @@ mod a {
 mod b {
     #[no_mangle]
     pub extern fn fail() {
-    //~^ symbol `fail` already exists
+    //~^ symbol `fail` is already defined
     }
 }

src/test/compile-fail/dupe-symbols-3.rs

@@ -17,5 +17,5 @@ pub fn a() {
 
 #[no_mangle]
 pub fn fail() {
-//~^ symbol `fail` already exists
+//~^ symbol `fail` is already defined
 }

src/test/compile-fail/dupe-symbols-4.rs

@@ -27,5 +27,5 @@ impl A for B {
 impl A for C {
     #[no_mangle]
     fn fail(self) {}
-    //~^ symbol `fail` already exists
+    //~^ symbol `fail` is already defined
 }

src/test/compile-fail/dupe-symbols-5.rs

@@ -16,5 +16,5 @@ static HELLO: u8 = 0;
 
 #[export_name="fail"]
 pub fn b() {
-//~^ symbol `fail` already exists
+//~^ symbol `fail` is already defined
 }

src/test/compile-fail/dupe-symbols-6.rs

@@ -15,4 +15,4 @@ static HELLO: u8 = 0;
 
 #[export_name="fail"]
 static HELLO_TWICE: u16 = 0;
-//~^ symbol `fail` already exists
+//~^ symbol `fail` is already defined

src/test/compile-fail/dupe-symbols-7.rs

@@ -8,14 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 //
-#![crate_type="rlib"]
+// error-pattern: entry symbol `main` defined multiple times
 #![allow(warnings)]
 
-extern {
-    fn fail();
-}
-
-#[export_name="fail"]
-pub fn a() {
-//~^ symbol `fail` already exists
-}
+#[no_mangle]
+fn main(){}

src/test/compile-fail/dupe-symbols-8.rs

@@ -1,15 +0,0 @@
-// 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.
-//
-// error-pattern: entry symbol `main` defined multiple times
-#![allow(warnings)]
-
-#[no_mangle]
-fn main(){}