}

func (m *mstate) Setup() {
	if *indirsflag == "" {
		m.Usage("select input directories with '-i' option")
	}
	if *outdirflag == "" {
		m.Usage("select output directory with '-o' option")
	}
	m.mm.SetModeMergePolicy(cmerge.ModeMergeRelaxed)
}

func (m *mstate) BeginPod(p pods.Pod) {
	m.mm.beginPod()
}

func (m *mstate) EndPod(p pods.Pod) {
	m.mm.endPod(*pcombineflag)
}

	}
	err = m.SetModeAndGranularity("mdf1.data", coverage.CtrModeSet, coverage.CtrGranularityPerFunc)
	if err == nil {
		t.Fatalf("expected granularity clash, not found")
	}
	m.SetModeMergePolicy(cmerge.ModeMergeRelaxed)
	err = m.SetModeAndGranularity("mdf1.data", coverage.CtrModeCount, coverage.CtrGranularityPerBlock)
	if err != nil {
		t.Fatalf("unexpected clash: %v", err)
	}

// coverage counter data files.
type Merger struct {
	cmode    coverage.CounterMode
	cgran    coverage.CounterGranularity
	policy   ModeMergePolicy
	overflow bool
}

func (cm *Merger) SetModeMergePolicy(policy ModeMergePolicy) {
	cm.policy = policy
}

// MergeCounters takes the counter values in 'src' and merges them
// into 'dst' according to the correct counter mode.

	// executed at least once, so it's ok to (effectively) merge
	// together runs derived from different counter modes.
	if d.cmd == percentMode || d.cmd == funcMode || d.cmd == pkglistMode {
		d.cm.SetModeMergePolicy(cmerge.ModeMergeRelaxed)
	}
	if d.cmd == pkglistMode {
		d.pkgpaths = make(map[string]struct{})
	}
	return d
}

// dstate encapsulates state and provides methods for implementing