Fixup path fragments upon MBE transcription #15360
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Fixes #14367
There are roughly two types of paths: paths in expression context, where a separator
::between an identifier and its following generic argument list is mandatory, and paths in type context, where::can be omitted.Unlike rustc, we need to transform the parsed fragments back into tokens during transcription. When the matched path fragment is a type-context path and is transcribed as an expression-context path, verbatim transcription would cause a syntax error.
This PR fixes up path fragments by inserting
::to make sure they are syntactically correct in all contexts. Note that this works because expression-context paths are a strict superset of type-context paths.