he/him 
JS type systems have a long way to go to achieve good error messages.pic.twitter.com/CNTA2VUWCI
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What would
@elmlang do?
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Unresolved reference. None of the following candidates is applicable because of receiver type mismatch --
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I like the arity mismatch: expected x given y error in Dr. Racket.
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For what it's worth, C# throws "No overload for method 'Square' takes 2 arguments".
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