expand: Tweak a comment in implementation of macro_rules
#78603
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Rollup of 6 pull requests Successful merges: - rust-lang#78073 (Add #[inline] to some functions in core::str.) - rust-lang#78596 (Fix doc links to std::fmt) - rust-lang#78599 (Add note to process::arg[s] that args shouldn't be escaped or quoted) - rust-lang#78602 (fix various aliasing issues in the standard library) - rust-lang#78603 (expand: Tweak a comment in implementation of `macro_rules`) - rust-lang#78621 (Inline Default::default() for atomics) Failed merges: r? `@ghost`
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The answer to the removed FIXME is that we don't apply mark to the span
spjust because that span is no longer used. We could apply it, but that would just be unnecessary extra work.The comments in code tell why the span is unused, it's a span of
$varliterally, which is lost forttvariables because their tokens are outputted directly, but kept for other variables which are outputted as groups andspis kept as the group's span.Closes #2887