How to Resolve 'Invalid Recursive Type' Errors in Go Struct Definitions?

Resolving "Invalid Recursive Type" in Go Struct for Interpreter Implementation

In Go, when attempting to define a struct with recursive type, such as an Environment struct with a parent field that references its own type, you may encounter the error "invalid recursive type." Here's how to resolve this issue and understand the underlying reason:

Recursive Types and Pointers

In Go, a struct that references its own type directly will result in the compiler being unable to determine the size of the struct. To resolve this issue, we need to use a pointer to the struct instead of directly including the struct.

Modified Environment Struct

The following corrected version of the Environment struct uses a pointer to its parent field:

type Environment struct {
    parent *Environment // note that this is now a pointer
    symbol string
    value  RCFAEValue
}

By using a pointer, we allow the compiler to determine the size of the struct since a pointer's size is predefined.

Environment Creation

When creating a new Environment, we need to pass a pointer to the parent environment instead of the environment itself:

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

This ensures that we are using the correct type and that the struct is valid.

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