How to Resolve the 'invalid recursive type' Error When Using Recursive Types in Go Structs?

Recursive Type in a Struct in Go

Creating data structures with recursive types can lead to the "invalid recursive type" error in Go. Take the case of defining an Environment struct:

type Environment struct {
    parent Environment
    symbol string
    value  RCFAEValue
}

This code results in the error because the compiler cannot determine the size of Environment. The parent field itself contains an Environment, leading to an infinite regression.

To resolve this, Environment should be modified to use a pointer to another Environment instead of embedding it directly:

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

A pointer's size is known, unlike a self-referencing structure.

When creating an Environment, the new syntax reflects the pointer change:

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

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