Decrement and increment operators

Increment and decrement of integers are supported using the builtins incr and decr:

incr(number)
decr(number)

which expand to the numerical value of number, incremented, or decremented, respectively, by one.

incr(4)
=>5
decr(7)
=>6

The builtin macros incr and decr are recognized only when given arguments.

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