diff --git a/src/test/compile-fail/dupe-symbols-1.rs b/src/test/compile-fail/dupe-symbols-1.rs
new file mode 100644
index 000000000000..08370b534cdf
--- /dev/null
+++ b/src/test/compile-fail/dupe-symbols-1.rs
@@ -0,0 +1,21 @@
+// 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.
+//
+#![crate_type="rlib"]
+#![allow(warnings)]
+
+#[export_name="fail"]
+pub fn a() {
+}
+
+#[export_name="fail"]
+pub fn b() {
+//~^ symbol `fail` already exists
+}
diff --git a/src/test/compile-fail/dupe-symbols-2.rs b/src/test/compile-fail/dupe-symbols-2.rs
new file mode 100644
index 000000000000..592874491e01
--- /dev/null
+++ b/src/test/compile-fail/dupe-symbols-2.rs
@@ -0,0 +1,25 @@
+// 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.
+//
+#![crate_type="rlib"]
+#![allow(warnings)]
+
+mod a {
+    #[no_mangle]
+    pub extern fn fail() {
+    }
+}
+
+mod b {
+    #[no_mangle]
+    pub extern fn fail() {
+    //~^ symbol `fail` already exists
+    }
+}
diff --git a/src/test/compile-fail/dupe-symbols-3.rs b/src/test/compile-fail/dupe-symbols-3.rs
new file mode 100644
index 000000000000..af5622861ef7
--- /dev/null
+++ b/src/test/compile-fail/dupe-symbols-3.rs
@@ -0,0 +1,21 @@
+// 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.
+//
+#![crate_type="rlib"]
+#![allow(warnings)]
+
+#[export_name="fail"]
+pub fn a() {
+}
+
+#[no_mangle]
+pub fn fail() {
+//~^ symbol `fail` already exists
+}
diff --git a/src/test/compile-fail/dupe-symbols-4.rs b/src/test/compile-fail/dupe-symbols-4.rs
new file mode 100644
index 000000000000..738dce6fed1a
--- /dev/null
+++ b/src/test/compile-fail/dupe-symbols-4.rs
@@ -0,0 +1,31 @@
+// 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.
+//
+#![crate_type="rlib"]
+#![allow(warnings)]
+
+
+pub trait A {
+    fn fail(self);
+}
+
+struct B;
+struct C;
+
+impl A for B {
+    #[no_mangle]
+    fn fail(self) {}
+}
+
+impl A for C {
+    #[no_mangle]
+    fn fail(self) {}
+    //~^ symbol `fail` already exists
+}
diff --git a/src/test/compile-fail/dupe-symbols-5.rs b/src/test/compile-fail/dupe-symbols-5.rs
new file mode 100644
index 000000000000..5ca9ca871289
--- /dev/null
+++ b/src/test/compile-fail/dupe-symbols-5.rs
@@ -0,0 +1,20 @@
+// 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.
+//
+#![crate_type="rlib"]
+#![allow(warnings)]
+
+#[export_name="fail"]
+static HELLO: u8 = 0;
+
+#[export_name="fail"]
+pub fn b() {
+//~^ symbol `fail` already exists
+}
diff --git a/src/test/compile-fail/dupe-symbols-6.rs b/src/test/compile-fail/dupe-symbols-6.rs
new file mode 100644
index 000000000000..9fbc292930ec
--- /dev/null
+++ b/src/test/compile-fail/dupe-symbols-6.rs
@@ -0,0 +1,18 @@
+// 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.
+#![crate_type="rlib"]
+#![allow(warnings)]
+
+#[export_name="fail"]
+static HELLO: u8 = 0;
+
+#[export_name="fail"]
+static HELLO_TWICE: u16 = 0;
+//~^ symbol `fail` already exists
diff --git a/src/test/compile-fail/dupe-symbols-7.rs b/src/test/compile-fail/dupe-symbols-7.rs
new file mode 100644
index 000000000000..b061f9e257e7
--- /dev/null
+++ b/src/test/compile-fail/dupe-symbols-7.rs
@@ -0,0 +1,21 @@
+// 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.
+//
+#![crate_type="rlib"]
+#![allow(warnings)]
+
+extern {
+    fn fail();
+}
+
+#[export_name="fail"]
+pub fn a() {
+//~^ symbol `fail` already exists
+}
diff --git a/src/test/compile-fail/dupe-symbols-8.rs b/src/test/compile-fail/dupe-symbols-8.rs
new file mode 100644
index 000000000000..c2880ba6f51e
--- /dev/null
+++ b/src/test/compile-fail/dupe-symbols-8.rs
@@ -0,0 +1,15 @@
+// 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(){}