[cfe-dev] can Clang Plugin modify the AST and send it back to the next step of compliation?

[Yafei Liu via cfe-dev]

All the examples of Clang plugin and FrontendActions I've read are to get
the AST and print some information, I'm curious if I can modify the AST to
make some dialect C++ language?

I got some examples I think is easy to do if AST could be modified:
1. make all subclasses inherit baseclasses' friend class
2. make all method virtual (like Java)
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