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let

  config = 
    {
      services.sshd.enable = true;
      services.sshd.port = 22;
      services.httpd.port = 80;
      hostName = "itchy";
      a.b.c.d.e.f.g.h.i.j.k.l.m.n.o.p.q.r.s.t.u.v.w.x.y.z = "x";
      foo = {
        a = "a";
        b.c = "c";
      };
    };

in
assert config.services.sshd.enable;
[
  config.services.sshd.port
  config.services.httpd.port
  config.hostName
  config.a.b.c.d.e.f.g.h.i.j.k.l.m.n.o.p.q.r.s.t.u.v.w.x.y.z
  config.foo.a
  config.foo.b.c
]