Also with transformers: panic: reflect: reflect.flag.mustBeAssignable using unaddressable value

[dionysius]

https://play.golang.org/p/gjrJVEVi5ju

I believe this issue has probably the same root cause as #162 #103 #90. I added this issue because I'm experiencing this bug as well when using Transformers.

The transformer in short: it merges a slice of a struct by a matching field name so that in the resulting slice is still unique for that field name, that's why WithAppendSlices is not sufficient for me.

As you can see in the playground, the transformer is perfectly fine in all cases, including "a manual merge recursion", but fails once there is a map[string]<struct> where struct is passed as value. It exact that case the dst reflect.Value CanSet returns false.

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[darccio]

Closing in favour of #162