This document contains a list of suggested AST fields

AstNode
	- Position (the location in the file for the construct)

ProgramNode
	- list of DeclNodes (globals)

VarDeclNode
	- TypeNode (variable type declared)
	- IDNode (variable name declared)

FnDeclNode
	- TypeNode (return type)
	- IDNode (name of the function being declared)
	- list of FormalDeclNodes (formal parameters)
	- list of StmtNodes (the function body)

AssignStmtNode
	- LocNode (the destination location)
	- ExpNode (the source expression)

ReadStmtNode
	- LocNode (a file variable from which to read)
	- LocNode (a variable that will receive file data)

WriteStmtNode
	- LocNode (a file variable to write)
	- ExpNode (the expression being written)

OpenNode
	- LocNode (the file to open)
	- std::string (path to the file)

CloseNode
	- LocNode (the file to close)

PostDecStmtNode / PostIncStmtNode
	- LocNode (a location being being decremented)

IfStmtNode
	- ExpNode (the condition being evaluated)
	- list of StmtNode (body of the if stmt)

IfElseStmtNode
	- ExpNode (the condition being evaluated)
	- list of StmtNode (true branch of the if stmt)
	- list of StmtNode (false branch of the if stmt)

WhileStmtNode
	- ExpNode (the condition being evaluated)
	- list of StmtNode (body of the loop)

TernaryExpNode
	- ExpNode (the condition being evaluated)
	- ExpNode (the expression to assign if true)
	- ExpNode (the expression to assign if false)

ReturnStmtNode
	- ExpNode (the expression being returned - could be null)

CallStmtNode
	- CallExpNode (the underlying function call expression)

CallExpNode
	- IDNode (the name of the function being called)
	- list of ExpNode (arguments)

IDNode
	- std::string (the name of the identifier)

BinaryExpNode
	- ExpNode (the lhs operand of the operation)
	- ExpNode (the rhs operand of the operation)

PlusNode / MinusNode / etc
	(no extra fields needed beyond superclass)

UnaryExpNode
	- ExpNode (the underlying expression)

NotNode / NegNode
	(no extra fields needed beyond superclass)

IntTypeNode / other primitive type nodes
	(no fields needed beyond superclass)

FileTypeNode
	(no fields needed beyond superclass)

IndexNode
	- IDNode (array being indexed)
	- ExpNode (index expression)

Literal nodes
	- basic type holding the underlying literal value