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update fragment specifiers/allow spaces in metavariable declarations #49

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update fragment specifiers/allow spaces in metavariable declarations #49

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Commits on Nov 11, 2024

  1. update fragment specifiers/allow spaces in metavariable declarations 

    - Add `pat_param` specifier from 2021 edition
- Add `expr_2021` specifier from 2024 edition: https://doc.rust-lang.org/edition-guide/rust-2024/macro-fragment-specifiers.html
  - This specifier is currently unstable but the name seems to be confirmed: rust-lang/rust#123742 (comment)
- Require a word boundary (`\b`) at the end of the specifier
- Replace `[A-Za-z0-9_]` with `\w`
- Allow spaces before and after the `:` in metavariable declarations
- Add tests for the new specifiers and spacing
    @youngspe
    youngspe committed Nov 11, 2024
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