On: Printing the contents of a C macro

[billconan]

This is so great! I wanted this since forever. That's been said, shouldn't this be a compiler feature? print out macro at compile time for easy debugging?

[BruceIV → billconan]

`gcc -E foo.c` will just run the pre-processor and print to stdout (including expanding all the `#include`s, so it's a bit verbose).