Support multi-character punct tokens in MBE#13854
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This was referenced Jan 2, 2023
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Fixes #11497
In the context of MBE, consecutive puncts are parsed as multi-character punct tokens whenever possible. For example,
:::is parsed as[Punct(`::`), Punct(`:`)]and shouldn't get matched to patterns like: : :or: ::.We have implemented this behavior only for when we match puncts against
ttfragments, but not when we match puncts literally. This PR extracts the multi-character punct handling procedure into a separate method and extends its support for literal matching.For good measure, this PR adds support for
<-token, which is still considered as one token in rustc despite the placement syntax having been removed.