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Is the following possible (in spirit) with the GHC?
-- Syntax error: parse error on input `a'
class Foo a b c | (a, b) -> c where
foo :: a -> b -> c
What alternatives do I have?
class Foo a b c | a b -> cshould work fine; it’s the same syntax on the right-hand side, too.as -> bssimply means that as collectively determines every bs.