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tracking issue for ? macro repetition #48075
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B-unstableBlocker: Implemented in the nightly compiler and unstable.Blocker: Implemented in the nightly compiler and unstable.C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFCT-langRelevant to the language teamRelevant to the language teamdisposition-mergeThis issue / PR is in PFCP or FCP with a disposition to merge it.This issue / PR is in PFCP or FCP with a disposition to merge it.finished-final-comment-periodThe final comment period is finished for this PR / Issue.The final comment period is finished for this PR / Issue.
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B-unstableBlocker: Implemented in the nightly compiler and unstable.Blocker: Implemented in the nightly compiler and unstable.C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFCT-langRelevant to the language teamRelevant to the language teamdisposition-mergeThis issue / PR is in PFCP or FCP with a disposition to merge it.This issue / PR is in PFCP or FCP with a disposition to merge it.finished-final-comment-periodThe final comment period is finished for this PR / Issue.The final comment period is finished for this PR / Issue.
RFC: rust-lang/rfcs#2298
Status
?macro repetition #47752)?as a macro separator and Kleene op in 2018 edition #51934)Known bugs
None.
Unresolved questions to be answered before stabilization
?Kleene operator accept a separator? Adding a separator is completely meaningless (since we don't accept trailing separators, and ? can accept "at most one" repetition), but allowing it is consistent with+and*. Currently, we allow a separator. We could also make it an error or lint.