invalid recursive type in a struct in go

Question

I am new to the Go programming language and I have an assignment to create and interpreter but I am running into the following problem:

I want to define an Environment a

Answer 1

I hope this should fix the problem:

Environment{&fun_Val.ds,fun_Val.param,exp.arg_exp.interp(env)}

(The & is the 'address of' operator in Go.)