clarify test purpose

RalfJung · web-flow · commit c9b36b4dedab · 2022-08-29T07:46:03.000-04:00
diff --git a/tests/pass/stacked-borrows/zst-field-retagging-terminates.rs b/tests/pass/stacked-borrows/zst-field-retagging-terminates.rs
@@ -1,4 +1,5 @@
 //@compile-flags: -Zmiri-retag-fields
+// Checks that the test does not run forever (which relies on a fast path).
 fn main() {
     let array = [(); usize::MAX];
     drop(array); // Pass the array to a function, retagging its fields

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,5 @@`
`1`	`1`	`//@compile-flags: -Zmiri-retag-fields`
	`2`	`+// Checks that the test does not run forever (which relies on a fast path).`
`2`	`3`	`fn main() {`
`3`	`4`	`let array = [(); usize::MAX];`
`4`	`5`	`drop(array); // Pass the array to a function, retagging its fields`