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Showing content from https://github.com/rust-lang/rust/issues/48075 below:

tracking issue for `?` macro repetition · Issue #48075 · rust-lang/rust · GitHub

RFC: rust-lang/rfcs#2298

• RFC accepted
• Preliminary implementation started ( Implement ? macro repetition #47752)
• Preliminary implementation available
• Edition-dependent behavior proposed (see Change behavior of ? as a macro separator and Kleene op in 2018 edition #51934)
• Stabilization proposed
• Stabilized

None.

• Should the ? 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.

ebkalderon, real-felix, H2CO3 and boozookalexreg, mark-i-m, estebank, hcpl, H2CO3 and 1 more

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