interpolation - Unknown haskell operator; `<>` -

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this code appears use <> interpolation operator. https://github.com/hlian/linklater/blob/master/examples/app/jointphotographicexpertsgrouptonga.hs

i can not find documentation nor source operator. ideas does/where from.

traditionally, <> function defined in data.monoid.

(<>) :: monoid => -> -> (<>) = mappend

however, semigroups package has long used method of semigroup class in data.semigroup. of ghc 8, data.semigroup has moved base package. there plan in place making semigroup superclass of monoid. once complete, <> function entirely replaced <> method.


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