MAX_BACK_EDGE_STRUCTS   88 gc/backgraph.c 	    		GET_MEM(MAX_BACK_EDGE_STRUCTS*sizeof(back_edges));
MAX_BACK_EDGE_STRUCTS   96 gc/backgraph.c   if (GC_n_back_edge_structs >= MAX_BACK_EDGE_STRUCTS - 1) {