Implement at-most-one repetitions of token groups in macros #17839
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…mple: `$($foo:ident)?` This could be simulated with `*`, but I think it's nice to be able to express the intent explicitly.
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Currently modifications to the macro system require an RFC (see #17759 for an example), could you submit an RFC for a change such as this? |
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Closing due to the requirement for an RFC. |
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