return digest, b.werr
	}
	return digest, nil
}

// HashFuncDesc computes an md5 sum of a coverage.FuncDesc and returns
// a digest for it.
func HashFuncDesc(f *coverage.FuncDesc) [16]byte {
	h := md5.New()
	tmp := make([]byte, 0, 32)
	hashFuncDesc(h, f, tmp)
	var r [16]byte
	copy(r[:], h.Sum(nil))
	return r
}

// hashFuncDesc incorporates a given function 'f' into the hash 'h'.

		// the function and look it up in the package ftab to see if we've
		// encountered it before. If we haven't, then register it with the
		// meta-data builder.
		fnhash := encodemeta.HashFuncDesc(fd)
		gfidx, ok := mm.p.ftab[fnhash]
		if !ok {
			// We haven't seen this function before, need to add it to
			// the meta data.
			gfidx = uint32(mm.p.cmdb.AddFunc(*fd))
			mm.p.ftab[fnhash] = gfidx