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CS164 Project 1 (What are we doing? implementing a parser of python 2.7)

- - - - NODE(AST_Type, ...)
        create a node in the AST for a non-terminal symbol.
        For AST_Type, use the appropriate type from ast-types.i.
        ... is where you list out the node's children. You can list as many as you want, or you can lump them all into a single AST_Vect.
        After the node has been created, use $$->setLoc(currentLocation()) to set the node's line number.
        Why do we pass the location as a parameter when making a leaf, but not here???
        print_stmt: "print" expression_list { $$ = NODE(PRINTLN_AST, $2) }
      - LEAF(AST_Type, *semantic_val_pointer, currentLocation())
        make node in the AST for a terminal symbol.
        expression:
        INT { $$ = LEAF(INT_LITERAL_AST, *$1, @1}
        Here's the incorrect example from the skeleton code. *$1 dereferences the INT, I think.
      - ast-types.i
        refer to this when selecting your ast type
      - AST_Vect
        stmt_list:
        print_stmt NEWLINE { \$\$ = new AST_Vect(1, $1)
        | stmt_list print_stmt NEWLINE { \$\$ = $1; \$\$->push_back(print_stmt) }
        A NODE's children can be EITHER a bunch of nodes, or a SINGLE AST_Vect. Cannot initialize with both.
  - - - T can be an I (such as int)
        TYPED_ID_AST
      - T can be a type_var, such as $AType
        I think this is a custom type.
        TYPE_VAR_AST
      - what is a formals list?
        a list of parameters for a function.
        type formals list is for classes