On Sat, Sep 12, 2015 at 9:15 PM, Sevcsik András <sevcsik@gmail.com> wrote:

How it's decided what type should Aeson try to decode to? What type is that gives me Nothing on whatever JSON input I give?

ghci has ExtendedDefaultRules enabled, which means that many things will infer a type of () if one cannot otherwise be determined. This is not something Aeson has control over.

Try ":seti -XNoExtendedDefaultRules" and ask ghci again; it should produce an ambiguous type error.

--

brandon s allbery kf8nh                               sine nomine associates

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