In GHCi when I type pure 2 it returns 2; or pure "aa" returns "aa". I wonder how this applicative instance is resolved for 2 or "aa" by GHCi.
Understanding how the pure function is resolved in Haskell
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GHCi performs some magic to be user-friendly.
When entering an expression whose type is of the form
... => f a, it tries to instantiateftoIO. In your case, this is possible sinceIOis an applicative (and a monad).Secondly, when an expression having a type of the form
... => IO ais entered, it is run as an IO action.Finally, if
ais of classShow, the result is printed. In your case"aa"is the result (and the typeaisString), so GHCi prints that.