Auto merge of #47099 - SergioBenitez:master, r=jseyfried
Add 'Span::parent()' and 'Span::source()' to proc_macro API. As the title suggests: a couple of useful methods for `proc_macro`.
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Add 'Span::parent()' and 'Span::source()' to proc_macro API. As the title suggests: a couple of useful methods for `proc_macro`.