Scope Function: A function struct that contains a name, list of patterns for which it is defined and an expression (i.e function body) for each patter

Function Object: A container for basic values that wraps literals, functions, lists and maps. Contains a type, value (for literals), function struct (

STNode: A single syntax tree node that has a 'head' (i.e value), type, list of child nodes and flags/fields for operators

STNode Scope: A 'scope' struct that has a parent scope and a map of strings to objects