Prervent instantiation of Loader and TextLoader
Return type of member function in Parser
Exception case in Warning() and Error()
Differentiate program error and compile error
Ignore .exe
Token list not include Token::Type::END_OF_FILE
Use iterator when finding end of token list
Move Warning() and Error() to bottom of code
Last member of list for insert_after()
Implementation of Block() and Statement()
Change AssignmentNode to AssignmentExpressionNode
All member node is pointer
Implementation of Expression()
Node::Type
Initialize expression in ReturnNode

jump
→ redo
| break
| return expression
| return