Rollup merge of #62068 - ia0:fix_meta_var, r=petrochenkov
Fix meta-variable binding errors in macros The errors are either: - The meta-variable used in the right-hand side is not bound (or defined) in the left-hand side. - The meta-variable used in the right-hand side does not repeat with the same kleene operator as its binder in the left-hand side. Either it does not repeat enough, or it uses a different operator somewhere. This change should have no semantic impact. Found by https://github.com/rust-lang/rust/pull/62008
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