This does not work for the same reason []*MyType cannot be converted to
[]MyInterface or even to []interface{}: the in-memory representation of an
interface is not the same as of the concrete type. See also
https://golang.org/doc/faq#convert_slice_of_interface
> On Nov 1, 2016, at 6:54 AM, Steven Hartland <ste...@multiplay.co.uk> wrote:
>
> I was playing with a design today where I had a number of types which match
> an interface and was surprised that I couldn't make use of this fact in
> passing their new functions into a method.
>
> It seems that even though the returned type matches the interface within the
> function argument go doesn't do the coercion needed to make this happen,
> instead if errors:
> cannot use NewMyType (type func() (*MyType, error)) as type func()
> (MyInterface, error) in argument to wibble.
>
> Here MyType satisfies MyInterface, a full example can be seen here:
> https://play.golang.org/p/r27a081joD <https://play.golang.org/p/r27a081joD>
>
> My workaround is currently to run the function and pass the results in, but
> that seems like it should be unnecessary.
> var i MyInterface
> var err error
> i, err = NewMyType()
> wibble(i, err)
>
> Where wibble is:
> func wibble(i MyInterface, err error) {
> ...
> }
>
> I can't see any reason why this wouldn't be supported, so possibly a future
> version could make this possible?
>
> Regards
> Steve
>
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