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My attempt to fix #167. I noticed that in the code for singling instance declarations (
singInstD
inData.Singletons.Single
), there's a case in whichsingletons
fails to look up a singled function name and instead resorts to callingdsReify
again. But after this call todsReify
, it uses the reified function type signature without expanding through type synonyms! Adding a call toexpand
afterwards seems to do the trick.