Add link to issue for src/test/incremental/async-lifetimes.rs

Author: michaelwoerister

src/test/incremental/async-lifetimes.rs

@@ -1,6 +1,8 @@
 // revisions: rpass1 rpass2
 // edition:2021
 
+// See https://github.com/rust-lang/rust/issues/98890
+
 #![allow(unused)]
 
 struct Foo;