[go-nuts] At runtime, is there a way to tell the structure's symbol name, of which a bound method offered a satisfactory implementation of a function type?

[Houzuo Guo]

Hello fellow gophers.

Given a function type: type Fun func()

And two structure methods that satisfy the function type:

type Alpha struct {
}
func (a Alpha) funA() {
}

type Beta struct {
}
func (b Beta) funB() {
}

At runtime, is there a way to tell whether a non-nil `var f Fun` is 
assigned to an arbitrary instance of structure Alpha, or Beta? Can 
reflection help in this case?

Thanks!

Kind regards,
Howard

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