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(Backport of #301.)
This commit fixes a bug pointed out by @alexarchambault. When
constructing an
A => B
value fromCogen[A]
andGen[B]
, we needto be able to reliably generate a
B
value given aSeed
. ThedoPureApply
method was given the ability to retry -- butunfortunately, it used the same result value (with the same seed)
instead of trying a new one, defeating the retry code.
This commit fixes that problem. It adds tests to ensure that filtered
generators that can also produce real values can be used with
Gen.function1. (If a generator can never produce values it will still
be a problem.)
Fixes #300.