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Auto merge of #43230 - alexcrichton:more-tokenstream, r=nrc,jseyfried
Implement tokenization for some items in proc_macro This PR is a partial implementation of #43081 targeted towards preserving span information in attribute-like procedural macros. Currently all attribute-like macros will lose span information with the input token stream if it's iterated over due to the inability of the compiler to losslessly tokenize an AST node. This PR takes a strategy of saving off a list of tokens in particular AST nodes to return a lossless tokenized version. There's a few limitations with this PR, however, so the old fallback remains in place.
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