Okay. That's what comes from trying to program when I've just got up!.
Somewhere in my head I had this vague recollection of seeing an 'array of bits' in what I remembered as being C code.
Now I've woken up a bit; what I was thinking of was LLVM's arbitrary bit integer type.
| For: | Use: | ||
| & | & | ||
| < | < | ||
| > | > | ||
| [ | [ | ||
| ] | ] |