Setter not working for non-pointer Fields?

I want to use the Setter interface to (un)marshal into custom types. I can't get this to work, and the sources/tests of goyaml won't enlighten me. Maybe it's a bug? A simillar implementation with encoding/json works fine. One of the tests (TestUnmarshalWithSetter) for this feature of goyaml uses a pointer field. Without the pointer, it won't work (maybe its more like a missing feature?).

I attached a sample go file using both encoding/json and goyaml. I want this to work without changing the field to a pointer. But beside that, it also won't work after changing to a pointer field.

Thanks :) !