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syntax: Add question mark to macro repetition ops #428

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syntax: Add question mark to macro repetition ops #428

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Commits on Dec 9, 2020

  1. syntax: Add question mark to macro repetition ops 

    As given in the reference, here:
  https://doc.rust-lang.org/reference/macros-by-example.html
the repetition operators are `*`, `+`, and `?`.

This commit adds highlighting for `?`
    @sharnoff
    sharnoff committed Dec 9, 2020
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