This can also happen outside of macros (at least for invalid code).
Consider you have two string literals in a function call:
f("aaaa", bbbb, "\"ccccc\"");
Now you forget one of the quotes of "aaaa" and end up with:
f("aaaa, bbbb, "\"ccccc\"");
Resulting in the tokens:
f -- ( -- "aaaa, bbbb, " -- \"ccccc\"" -- ) -- ;
Now the leading "\" gets interpreted as whitespace and is deleted. Maybe you
can add a test for that and verify that this is also fixed.
http://llvm-reviews.chandlerc.com/D1858
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