Here a guess:

    #if !(MIN_VERSION_integer-gmp(0,0,0))

Not sure if this works, but it might.

On Thu, Apr 19, 2018 at 1:13 PM, David Feuer <david.feuer@gmail.com> wrote:
Is there any way to determine whether Integer comes from integer-gmp
or integer-simple? I'm playing with the idea of using the underlying
representation to get more compact/efficient tries, but I need to be
able to find out what that representation is.
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-Andrew Thaddeus Martin