public StatementList(Statement statement, StatementList tail)
{
IsEmpty = false;
Head = statement;
Tail = tail;
}
public DeclarationClass(String name, StatementList decls)
{
Name = name;
Statements = decls;
}
public DeclarationMethod(String name, StatementList body)
{
ReturnType = new TypeVoid();
Name = name;
Body = body;
}