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Scott Linder 6218f09b03 [MC] Fix ICE with non-newline terminated input

There is an explicit option for the lexer to support this, but we crash
when `-preserve-comments` is enabled because it checks for
`getTok().getString().empty()` to detect the case. This doesn't
work currently because the lexer reports this case as a string of length
1, containing a null byte.

Change the lexer to instead report this case via an empty string, as the
null terminator isn't logically a part of the textual input, and the
check for `.empty()` seems natural and obvious in the calling code.

Reviewed By: niravd

Differential Revision: https://reviews.llvm.org/D92681

2020-12-09 23:39:32 +00:00

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