Rollup merge of #95761 - c410-f3r:meta-var-stuff, r=petrochenkov
Kickstart the inner usage of `macro_metavar_expr` There can be more use-cases but I am out of ideas. cc #83527 r? ``@petrochenkov``
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Kickstart the inner usage of `macro_metavar_expr` There can be more use-cases but I am out of ideas. cc #83527 r? ``@petrochenkov``