Segfault when parsing 4GB file.

["Soni L." <fakedme@...>]

So I gave Lua 5.2.3 (on archlinux x86_64) a 4GB file of " \n" (where \n is an actual newline). It segfaulted. I expected it to error with "chunk has too many lines". (Also, why are the errors all lowercase? ("chunk has too many lines" instead of "Chunk has too many lines"))

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