What does the period / dot mean?
forall a. Num a => a -> a -> a
Is it merely a separator?
forall notation: what does the period / dot mean?
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Yes, it's just a syntactic separator. It separates variable declarations from variable usages, just like the
->in a lambda expression. It means "Here endeth the binders". I suppose the language designers went for.because it's 22 characters shorter.