// new version of the package we're building.
	ftab map[[16]byte]uint32
}

func newMetaMerge() *metaMerge {
	return &metaMerge{
		pkm:    make(map[string]*pkstate),
		astate: &argstate{},
	}
}

func (mm *metaMerge) visitMetaDataFile(mdf string, mfr *decodemeta.CoverageMetaFileReader) {
	dbgtrace(2, "visitMetaDataFile(mdf=%s)", mdf)

	// Record meta-data file name.

// utility, which abstracts away most of the grubby details of reading
// coverage data files. Most of the heavy lifting for merging is done
// using apis from 'metaMerge' (this is mainly a wrapper around that
// functionality).
type mstate struct {
	mm *metaMerge
}

func (m *mstate) Usage(msg string) {
	if len(msg) > 0 {
		fmt.Fprintf(os.Stderr, "error: %s\n", msg)
	}

// to implement the CovDataVisitor interface, and is designed to be
// used in concert with the CovDataReader utility, which abstracts
// away most of the grubby details of reading coverage data files.
type sstate struct {
	mm    *metaMerge
	inidx int
	mode  string
	// Used only for intersection; keyed by pkg/fn ID, it keeps track of
	// just the set of functions for which we have data in the current
	// input directory.
	imm map[pkfunc]struct{}
}