Operators for generic n-ary product shrinking #3004
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Use 4n space indents for expressions. Use (4n+2) space indents for `where` clauses.
These operators allow us to define shrinkers with a syntax that is very
similar to the applicative syntax for defining generators.
For example:
```haskell
genMyRecord :: Gen MyRecord
genMyRecord = MyRecord
<$> genFoo
<*> genBar
<*> genBaz
shrinkMyRecord :: MyRecord -> [MyRecord]
shrinkMyRecord = genericRoundRobinShrink
<@> shrinkFoo
<:> shrinkBar
<:> shrinkBaz
<:> Nil
```
jonathanknowles
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Issue Number
#2999
Summary
This PR provides operators to make it easier to use generic n-ary product shrinking.
These operators allow us to compose shrinkers with a syntax that is very
similar to the applicative syntax for composing generators. This makes it easier to compare the definitions of generators and shrinkers that are related to one another.
For example: