- ("-frontend",Arg.Tuple[Arg.String(fun s->cur_dir:=s);Arg.String(fun s->cur_slice:=s;input_file_list:=(!cur_dir,!cur_slice)::!input_file_list)], "frontendN,slicenameN");
+ ("-frontend",Arg.Tuple[Arg.String(fun s->cur_dir:=s);
+ Arg.String(fun s->cur_slice:=s;
+ input_file_list:=(!cur_dir,!cur_slice)::!input_file_list)],
+ "frontendN,slicenameN");