1 files changed, 13 insertions, 0 deletions
diff --git a/src/test/ui/on-unimplemented/expected-comma-found-token.rs b/src/test/ui/on-unimplemented/expected-comma-found-token.rs
new file mode 100644
index 000000000..8fb34f211
--- /dev/null
+++ b/src/test/ui/on-unimplemented/expected-comma-found-token.rs
@@ -0,0 +1,13 @@
+// Tests that two closures cannot simultaneously have mutable
+// access to the variable, whether that mutable access be used
+// for direct assignment or for taking mutable ref. Issue #6801.
+
+#![feature(rustc_attrs)]
+
+#[rustc_on_unimplemented(
+    message="the message"
+    label="the label" //~ ERROR expected `,`, found `label`
+)]
+trait T {}
+
+fn main() {  }