Maybe take a look at:

https://github.com/golang/go/issues/10653

and/or

https://play.golang.org/p/Ka8bN3_V1f

to understand what works, and what does not.


On Wednesday, July 5, 2017 at 11:58:02 AM UTC-4, Tong Sun wrote:
>
> Can somebody give an example for the following? I made several attempts 
> but none is working. Thanks. 
>
> call
>       Returns the result of calling the first argument, which
>       must be a function, with the remaining arguments as parameters.
>       Thus "call .X.Y 1 2" is, in Go notation, dot.X.Y(1, 2) where
>       Y is a func-valued field, map entry, or the like.
>       The first argument must be the result of an evaluation
>       that yields a value of function type (as distinct from
>       a predefined function such as print). The function must
>       return either one or two result values, the second of which
>       is of type error. If the arguments don't match the function
>       or the returned error value is non-nil, execution stops.
>
>
>
>

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