[shaurz]

Making the minus part of the literal can lead to parsing ambiguity. For example, "x-3" would parse as 2 tokens "x" and "-3" (instead of 3 tokens "x", "-" and "3") which would be a syntax error in C. The only workaround I can think of is making any expression followed by a negative number parse as a subtraction.

[reycharles]

> Making the minus part of the literal can lead to parsing ambiguity.

Not really. It's done in java. Usually, minus ("-") is parsed as a token and then unary minus on integer literals are transformed to a negative integer literal.

So, -2147483648 is read as MINUS INT_LITERAL and thus transformed into "-2147483648" as an INT_LITERAL, but -(2147483648) should be read as MINUS L_PAREN INT_LITERAL R_PAREN and should thus not be transformed.