open Lib;;
Gc.compact ();;

(**
       0 CONSTINT 42
       2 PUSHACC0 
       3 MAKEBLOCK1 0
       5 POP 1
       7 SETGLOBAL Lib
       9 CONST0 
      10 C_CALL1 gc_compaction
      12 ATOM0 
      13 SETGLOBAL T330-compact-1
      15 STOP 
**)