Fix ICE #68058

src/test/ui/macros/issue-68058.rs

@@ -0,0 +1,15 @@
+// check-pass
+
+macro_rules! def_target {
+    ($target: expr) => {
+        #[target_feature(enable=$target)]
+        unsafe fn f() {
+            #[target_feature(enable=$target)]
+            ()
+        }
+    };
+}
+
+def_target!("avx2");
+
+fn main() {}