[cfe-dev] Get the location of a previous token in Clang

[james long via cfe-dev]

Dear all,

I am currently writing a libtooling tool.

Suppose  a 'pragma'  like following is registered:

#pragma tool

It is easily to get the location of token 'tool', but how to get the
location
of token 'pragma' ?  Which API should I use?

Thanks in advance!

Best
James
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