Prevent simple infinite recursion in the interpreter.

[misalcedo]

The tree-walking interpreter currently allows infinite recursion in the form of:

@x = x

That code would cause the interpreter to panic with a stack overflow error.

The goal is to prevent recursion for functions with no arguments (i.e., nullary functions).

See https://en.wikipedia.org/wiki/Arity

Also n-ary functions with nullary function parameters must not recurse.

Lastly, should verify if we should recursively check for infinite recursion. In other words: should an n-ary function with n-ary function parameters that are nullary recurse (and so on recursively, how many levels deep should we check)?

[stale[bot]]

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[stale[bot]]

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