Oh, it _does_ have string interpolation, my bad. Sadly, not by default -- you still have to go back and add an "f" before the string once you've started typing it and then realize that you want an interpolated string. Also, it doesn't always work -- if I define two interpolated string variables in one function, GCC chokes in a way I'm not understanding. And every interpolated string variable consumes 4K of global memory.