Add test of the list.

bench/Makefile

@@ -104,6 +104,7 @@ bench-collectionc:
 
 bench-collectionc0:
 	$(CC) $(CFLAGS) $(CPPFLAGS) -I "$${COLLECTIONC}/include" -L "$${COLLECTIONC}" -static bench-collectionc.c -lcollectc -o bench-collectionc.exe
+	@./bench-collectionc.exe 10
 	@./bench-collectionc.exe 20
 
 bench-plain: