Add some files
Add output_called_method_names
Add output_backtrace
Add notice_load. (#6)
Add output_info_of_no_method_error
Add notice_load.py
Add output_backtrace.py
Add some files
Add get_node_type
Add initial files
Add test_code.
Add print_value and print_string
Add print_symbol
Add print_integer
Add print_bool
Rename print_* to inspect_*
modify some label.
Add inspect_array
Add test case for inspect_value
Define cast method.