and another reference

tests/run-pass/coerce_non_capture_closure_to_fn_ptr.rs

@@ -26,7 +26,7 @@ fn main() {
     let g = magic1(|i| assert_eq!(i, 2)) as fn(i32);
     g(2);
 
-    // FIXME: This fails with "invalid use of NULL pointer"
+    // FIXME: This fails with "invalid use of NULL pointer" <https://github.com/rust-lang/miri/issues/1075>
     //let h: fn() -> ! = || std::process::exit(0);
     //h();
     // FIXME: This does not even compile?!? <https://github.com/rust-lang/rust/issues/66738>