1 files changed, 14 insertions, 0 deletions
diff --git a/tests/ui/check-cfg/empty-values.rs b/tests/ui/check-cfg/empty-values.rs
new file mode 100644
index 00000000000..7e6ba6ae84a
--- /dev/null
+++ b/tests/ui/check-cfg/empty-values.rs
@@ -0,0 +1,14 @@
+// Check that we detect unexpected value when none are allowed
+//
+// check-pass
+// compile-flags: --check-cfg=cfg(foo,values()) -Zunstable-options
+
+#[cfg(foo = "foo")]
+//~^ WARNING unexpected `cfg` condition value
+fn do_foo() {}
+
+#[cfg(foo)]
+//~^ WARNING unexpected `cfg` condition value
+fn do_foo() {}
+
+fn main() {}