Add FIXME note

JohnTitor · JohnTitor · commit 2f39ec24b20b · 2020-02-16T04:36:44.000+09:00
diff --git a/src/test/ui/specialization/issue-39618.rs b/src/test/ui/specialization/issue-39618.rs
@@ -1,4 +1,7 @@
 // Regression test for #39618, shouldn't crash.
+// FIXME(JohnTitor): Centril pointed out this looks suspicions, we should revisit here.
+// More context: https://github.com/rust-lang/rust/pull/69192#discussion_r379846796
+
 // check-pass
 
 #![feature(specialization)]
