separation of format string and arguments  printf()  Not safe, not extensible  Easier to read, no series of << insertion operators  Separation of format string and arguments  Easy to localize76 Text Easy to read, no series of << insertion operators  Separation of format string and arguments  Positional arguments  Easy to localize  More performant than sprintf(), ostringstream, and to_string()

diagnostic is a good start Compiler is a teacher/friend [# 100502 Avoid infinite loop in function arguments checking] A trivial fix may require a lot of time ? Fix the bug of next_point i n source_map

);What is being declared? OBJC_EXPORT id objc_msgSend(id self, SEL op, ...); Indicates variadic arguments… but does it in this case? 2018: objc_msgSend() doc – id objc_msgSend(id self, SEL op, ...); 2019+: