stringmark        205 lib/lua/lgc.c    if (f->source) stringmark(f->source);
stringmark        210 lib/lua/lgc.c        stringmark(f->upvalues[i]);
stringmark        218 lib/lua/lgc.c        stringmark(f->locvars[i].varname);
stringmark        340 lib/lua/lgc.c      stringmark(rawtsvalue(o));  /* strings are `values', so are never weak */