createChild method
Creates a child scope within this one.
You may optionally provide starter values
.
Implementation
SymbolTable<T> createChild({Map<String, T> values = const {}}) {
var child = SymbolTable(values: values);
child
.._depth = _depth + 1
.._parent = this
.._root = _root;
_children.add(child);
return child;
}