[darcs-devel] [patch1979] better shrinking for patches

[Ben Franksen]

Ben Franksen <ben.franksen at online.de> added the comment:

> Note it's only a clear improvement if dropping one element doesn't help
> but dropping two does.
> 
> It could also slow down shrinking substantially if most shrinks don't
> work (i.e. the test succeeds after shrinking). The instance for normal
> lists tries dividing the list in 2, 4, 8 etc as well as removing each
> individual element:
> 
> https://hackage.haskell.org/package/QuickCheck-2.13.2/docs/src/Test.QuickCheck.Arbitrary.html#shrinkList

Fascinating. Professional shrinking seems to be a black art. I'll
refrain from further comments.

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