Error (future) 690: "format7.cpp", line 383 # Nonempty source files must end with a newline that is

Error (future) 690: "format7.cpp", line 383 # Nonempty source files must end with a newline that is not preceded by a
    backslash.

Warning:        1 future errors were detected and ignored. Add a '+p' option to detect and fix them before they become fatal errors in a future release. Behavior of this ill-formed program is not guaranteed to match that of a well-formed program

今天调试遇到了这个问题，网上搜索到说是编译器的版本问题，本以为这是个错误，但是后来发现这个错误可以忽略的，貌似说在format7.cpp文件的最后，加上个空行就行。如果不行就直接忽略吧。我今天忽略了也没出什么问题。