Add check for rules that no repetition which could match an empty token #4139
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Fix #4103
for
/ui/issues/issue-57597.rsThis is
ParseErrorof the macro rules , because it is how rustc handle it :https://github.com/rust-lang/rust/blob/a58b1ed44f5e06976de2bdc4d7dc81c36a96934f/src/librustc_expand/mbe/macro_rules.rs#L558