431   struct derivation_step *first, *current, **lastp, *solution = NULL;  in find_derivation()  local
537 		      for (step = solution; step != NULL; step = step->next)  in find_derivation()
546 			  step->next = solution;  in find_derivation()
547 			  solution = step;  in find_derivation()
621 			  for (step = solution; step != NULL;  in find_derivation()
653   if (solution != NULL)  in find_derivation()
660       if (solution->next != NULL)  in find_derivation()
662 	  struct derivation_step *solution2 = solution->next;  in find_derivation()
664 	  if (solution2->cost_hi < solution->cost_hi  in find_derivation()
665 	      || (solution2->cost_hi == solution->cost_hi  in find_derivation()
666 		  && solution2->cost_lo < solution->cost_lo))  in find_derivation()
667 	    solution = solution2;  in find_derivation()
671       result = gen_steps (solution, toset_expand ?: toset,  in find_derivation()