Function check_capture

src/Chain/libraries/glua/lstrlib.cpp:253–258

static int check_capture(MatchState *ms, int l) {
    l -= '1';
    if (l < 0 || l >= ms->level || ms->capture[l].len == CAP_UNFINISHED)
        return luaL_error(ms->L, "invalid capture index %%%d", l + 1);
    return l;
}


static int capture_to_close(MatchState *ms) {