amccarth added inline comments.
================
Comment at: lib/Rewrite/Rewriter.cpp:455
I->second.write(File.getStream());
+ prewrite(I->first);
}
----------------
I'm not familiar with the structure of this code, but it seems odd to me that
the callback is called `prewrite` when it happens _after_ the write.
https://reviews.llvm.org/D30385
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