環状依存解決できた

できた。

parse_pacinfo:
  _LAST:
    version: 0.000000
  loop-b:
    version: 1.900000
    need[0]: loop-c;
  loop-a:
    version: 1.900000
    need[0]: loop-b;
  loop-c:
    version: 1.900000
    need[0]: loop-a;

  resolve_need_pointers depending:
    _LAST:
    loop-b: _DUMMY_loop-b
    _DUMMY_loop-b:
    loop-a: _DUMMY_loop-b
    loop-c: _DUMMY_loop-b