Plenty of languages provide filenames/line numbers in assertions without using macros. Furthermore, `__LINE__` and `__FILE__` style macros are a pretty safe su

Plenty of languages provide filenames/line numbers in assertions without using macros. Furthermore, `__LINE__` and `__FILE__` style macros are a pretty safe subset of macros that aren't really representative of the problems with macros. Compare: #include <stdlib.h> #include <stdio.h> #include "my_macro_library.h" int main() { int x = 0; printf("%i", increment(x)); printf("%i", __LINE__); return EXIT_SUCCESS; } There are a ton of different implementations of an `increment` macro which are going to cause undefined behavior here. Contrast with the `__LINE__` macro: it's implemented by the compiler and has unsurprising, well-defined behavior.