ioeric added inline comments.

================
Comment at: lib/Format/Format.cpp:1500
@@ +1499,3 @@
+  // Get the first token.
+  Lex.LexFromRawLexer(Tok);
+  skipComments(Lex, Tok);
----------------
djasper wrote:
> Can this go wrong? Maybe in an empty file?
Added a test case for empty file.

If the code is empty, Tok will be `tok::eof`, which would leave 
`MinInsertionOffset` as `Code.size()`. 

But the program does fail when we insert at the end of code that does not end 
with '\n'. We always +1 when we calculate the offset for each line (in the 
for-loop on Lines); however, the last line does not necessarily end with '\n', 
which makes offset exceed code size. I will fix this in a follow-up patch.



http://reviews.llvm.org/D20959



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