add Semigroup instance of Impls (for ghc-8.4.1, fixes #5)

mokus0 / flexible-defaults

Template Haskell system for implementing type classes with complex default-implementation rules

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Closed int-e closed 9 months ago

int-e commented 6 years ago

Note, I've opted for adding a semigroups package dependency; an alternative would be using CPP to make the instance conditional.

bgamari commented 6 years ago

It would be great if this could be merged.

int-e commented 6 years ago

Ping?