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dee7d0e730
Properly record metavar spans for other expansions other than TT This properly records metavar spans for nonterminals other than tokentree. This means that we operations like `span.to(other_span)` work correctly for macros. As you can see, other diagnostics involving metavars have improved as a result. Fixes #132908 Alternative to #133270 cc `@ehuss` cc `@petrochenkov`
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