rust/tests/target/issue_5691.rs

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struct S<const C: usize>
where
[(); { num_slots!(C) }]:, {
/* An asterisk-based, or a double-slash-prefixed, comment here is
required to trigger the fmt bug.
A single-line triple-slash-prefixed comment (with a field following it) is not enough - it will not trigger the fmt bug.
Side note: If you have a combination of two, or all three of the
above mentioned types of comments here, some of them disappear
after `cargo fmt`.
The bug gets triggered even if a field definition following the
(asterisk-based, or a double-slash-prefixed) comment, too.
*/
}