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Merge #4139
4139: Add check for rules that no repetition which could match an empty token r=matklad a=edwin0cheng

Fix #4103

for `/ui/issues/issue-57597.rs`

This is `ParseError` of the macro rules , because it is how rustc handle it : 

a58b1ed44f/src/librustc_expand/mbe/macro_rules.rs (L558)


Co-authored-by: Edwin Cheng <edwin0cheng@gmail.com>
2020-04-25 16:26:51 +00:00
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