small bug

[Roberto Ierusalimschy <roberto@...>]

There is a very subtle bug in 5.0 alpha, that happens (sometimes) when a
userdata has a GC method stored in a weak metatable. The correction is
as follows:

--- lgc.c

*** 485,490 ****
--- 485,491 ----
    separateudata(L);  /* separate userdata to be preserved */
    marktmu(&st);  /* mark `preserved' userdata */
    propagatemarks(&st);  /* remark */
+   cleartablevalues(&st);
    cleartablekeys(&st);
    luaC_collect(L, 0);
    checkMbuffer(L);


-- Roberto