Compiler state
--------------

Value                   mcss        cmeta       Rule-local  Modified

Input limit             r13         r13
Start of output         r14         r14
Output limit            r15         r15
Jump table              r11         r11
Input cursor            rsi         rsi                     *
Output cursor           rdi         rdi                     *
Line-comment character  r10         r10                     *
Label-gen counter       [rbx+64]    rcx (cl)                *
Label address table     [rdx]       [rdx]                   *
Error location          r12         rsi                     *
Matched character       [rbx]       [rbx]       *           *
Label-gen registers     [rbx+n*8]   [rbx+n]     *           *
Captures                [r8+n*16]               *           *
Backtracking addresses  [rsp]                   *           *