[Haskell-beginners] How do ambigious types compile with Aeson

[Brandon Allbery]

On Sat, Sep 12, 2015 at 9:15 PM, Sevcsik András <sevcsik at 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
allbery.b at gmail.com                                  ballbery at sinenomine.net
unix, openafs, kerberos, infrastructure, xmonad        http://sinenomine.net
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