GCSsweepstring
case GCSsweepstring: {
(bitmask(GCSsweepstring) | bitmask(GCSsweepudata) | bitmask(GCSsweep))
g->gcstate = GCSsweepstring;
(GCSsweepstring <= (g)->gcstate && (g)->gcstate <= GCSsweep)
luaC_runtilstate(L, ~bitmask(GCSsweepstring));