Function check_capture

Source/Misc/lua/src/lua.c:13863–13868

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");
return l;
}


static int capture_to_close (MatchState *ms) {