:until[syntax] :until generator expression
SRFI-42:
Runs generator until after expression has evaluated to non-#f. The
guarding expression is included in the scope of the variables introduced by
the generator.
Note the distinction between :while, stopping at a certain condition, and
:until, stopping after a certain condition has occurred. The latter implies
that the binding that has triggered termination has been processed by the
comprehension.
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