@HouzuoGuo you have a pointer to an interface value containing a Lemon, but what you actually want is an interface value containing a pointer to a Lemon.

https://play.golang.org/p/FyZp9CuQVo

@cespare thanks and I understood that my case is unconventional, but still I wish json.Unmarshal could figure it out without having to use reflect.

@HouzuoGuo pointer to interface of value is not equivalent to interface of
pointer, and only interface of pointer is sufficient. Interfaces do not
extend addressability to their contents like other kinds of values do, so
even though, with the pointer, the interface value itself is now
addressable, the boxed value is still a semantic copy of what you actually
want to modify.

On Wed, May 4, 2016, 2:22 AM Howard notifications@github.com wrote:

@cespare https://github.com/cespare thanks and I understood that my
case is unconventional, but still I wish json.Unmarshal could figure it out
without having to use reflex.

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#15535 (comment)

Sorry, the json package is pretty frozen. Regardless of whether it might be a good idea to make this work, at this point we're not going to make changes.