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On 8/28/10 22:15 , michael rice wrote:
> Prelude> fmap (*2) l
>
> <interactive>:1:0:
>    No instance for (Functor (Either Integer))
>    arising from a use of `fmap' at <interactive>:1:0-10
>    Possible fix:
>    add an instance declaration for (Functor (Either Integer))
>    In the expression: fmap (* 2) l
>    In the definition of `it': it = fmap (* 2) l
> Prelude>

Huh. I understood it to be defined in the Prelude, but didn't check.

Looks like it's now in Control.Monad.Instances (a relatively new module).
Confusing....

- --
brandon s. allbery    [linux,solaris,freebsd,perl] allbery@kf8nh.com
system administrator [openafs,heimdal,too many hats] allbery@ece.cmu.edu
electrical and computer engineering, carnegie mellon university KF8NH
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