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Rules used for type checking or inference

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Consider a function application in Language:Haskell like this:

not True

This expression applies logical negation (not) to the Boolean literal True. (For what it matters, the result of the function application would be False.) This expression type-checks because the associated rule of the type system succeeds, which is that the type of a function application is the result type of the applied function where the actual argument must be of the declared formal argument type.

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