addVar method
Implementation
void addVar(Name name, ) {
currentScope.environment.add(name.value);
if( null!=name.parent )
currentScope.variables.add((name.value, name.parent!));
}
void addVar(Name name, ) {
currentScope.environment.add(name.value);
if( null!=name.parent )
currentScope.variables.add((name.value, name.parent!));
}