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More readable formatting and identifier names. (#39)
This macro provides a a great example for developers learning macros to study. It's easy to discover, since libstd and many other crates depend on it, and the macro itself illustrates a number of useful concepts. This commit reformats some code to make the brackets easier to see, and renames a few identifiers for clarity. Additionally, the `+` and `?` repetition quantifiers have been used where appropriate instead of `*`, and an extra `( () () )` item has been removed, which had no effect.
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