Do recursive shrinking without recursive function calls #1
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Heavily based on the tuples and vectors tests
> This cuts my prop test run-times nearly in half!
This allows users to fairly easily migrate from CoreRng::fill_byte() and similar constructions without requiring them to fuss around with a new SeedableRng (or copy-paste this boilerplate) when their slice is just full of Arbitrary-able types. Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
The seed still can't be set by QuickCheck users, but the new Gen constructor is useful for other crates that use QuickCheck only for its Arbitrary trait. Closes BurntSushi#277
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Originally BurntSushi#294.