[cfe-dev] Modifying Token Stream

[Daniel Dilts]

I am attempting to write a FrontendAction that modifies certain tokens
before passing them on to be parsed.

Particularly I want to replace an identifier followed by a comment with
particular content with a string literal.

Does anyone know of an example where something similar is done?  I find
plenty of documentation on writing FrontendActions that deal with the AST,
but I am not finding much documentation on dealing with tokens before
generating an AST.
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