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The scanner performs some sketchy heuristics when it sees an ascii 1A
since it may be EOF or it may be part of a literal. Due to this, it
failed to detect an unterminated string literal if the opening quote was
unicode-escaped, leading to memory exhaustion as it read SUs until the
universe ended.
We're parsing a fixed input with known length! There's no reason to be
guessing about whether a char is EOF. If we're at the end of the file,
it's the end of file. Otherwise, it is not the end of the file.
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