1 files changed, 8 insertions, 0 deletions
diff --git a/third_party/rust/proc-macro2/tests/features.rs b/third_party/rust/proc-macro2/tests/features.rs
new file mode 100644
index 0000000000..073f6e60fb
--- /dev/null
+++ b/third_party/rust/proc-macro2/tests/features.rs
@@ -0,0 +1,8 @@
+#[test]
+#[ignore]
+fn make_sure_no_proc_macro() {
+    assert!(
+        !cfg!(feature = "proc-macro"),
+        "still compiled with proc_macro?"
+    );
+}