1 files changed, 30 insertions, 0 deletions
diff --git a/tests/ui/extern/extern-no-mangle.rs b/tests/ui/extern/extern-no-mangle.rs
new file mode 100644
index 00000000000..ab7c9824af0
--- /dev/null
+++ b/tests/ui/extern/extern-no-mangle.rs
@@ -0,0 +1,30 @@
+#![warn(unused_attributes)]
+
+// Tests that placing the #[no_mangle] attribute on a foreign fn or static emits
+// a specialized warning.
+// The previous warning only talks about a "function or static" but foreign fns/statics
+// are also not allowed to have #[no_mangle]
+
+// build-pass
+
+extern "C" {
+    #[no_mangle]
+    //~^ WARNING `#[no_mangle]` has no effect on a foreign static
+    //~^^ WARNING this was previously accepted by the compiler
+    pub static FOO: u8;
+
+    #[no_mangle]
+    //~^ WARNING `#[no_mangle]` has no effect on a foreign function
+    //~^^ WARNING this was previously accepted by the compiler
+    pub fn bar();
+}
+
+fn no_new_warn() {
+    // Should emit the generic "not a function or static" warning
+    #[no_mangle]
+    //~^ WARNING attribute should be applied to a free function, impl method or static
+    //~^^ WARNING this was previously accepted by the compiler
+    let x = 0_u8;
+}
+
+fn main() {}