A partial binary associative operator https://github.com/chris-martin/partial-semigroup
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There are no documented modules for this package.
A partial semigroup is like a semigroup, but the operator
is partial. We represent this in Haskell as a total function
(<>?) :: a -> a -> Maybe a.
(<>?) :: a -> a -> Maybe a
companion package provides support for checking the partial
semigroup associativity axiom using the