ambutils

The namespace fn/ambutils.fn contains a few utilities for working with then and back.

Fn	Description
require(condition)	Backtracks if condition is not true.
one_of(list)	Successively generates each element of the list, backtracking further when the list is exhausted.
some_of (list)	Successively generates each non-empty subset of the list, backtracking further when the list is exhausted.
integers_from(n)	Generates all integers, starting from n. Never backtracks.
integers_between(lower, upper)	Generates all integers between lower and upper inclusive, backtracks when exhausted.

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