You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: report_slices.go
    path of file: ./repos/teller/vendor/github.com/google/go-cmp/cmp
    
    the code of the file until where you have to start completion: // Copyright 2019, The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package cmp

import (
	"bytes"
	"fmt"
	"math"
	"reflect"
	"strconv"
	"strings"
	"unicode"
	"unicode/utf8"

	"github.com/google/go-cmp/cmp/internal/diff"
)

// CanFormatDiffSlice reports whether we support custom formatting for nodes
// that are slices of primitive kinds or strings.
func (opts formatOptions) CanFormatDiffSlice(v *valueNode) bool {
	switch {
	case opts.DiffMode != diffUnknown:
		return false // Must be formatting in diff mode
	case v.NumDiff == 0:
		return false // No differences detected
	case !v.ValueX.IsValid() || !v.ValueY.IsValid():
		return false // Both values must be valid
	case v.NumIgnored > 0:
		return false // Some ignore option was used
	case v.NumTransformed > 0:
		return false // Some transform option was used
	case v.NumCompared > 1:
		return false // More th
    
func cleanupSurroundingIdentical(groups []diffStats, eq func(i, j int) bool) []diffStats {
	var ix, iy int // indexes into sequence x and y
	for i, ds := range groups {
		// Handle equal group.
		if ds.NumDiff() == 0 {
			ix += ds.NumIdentical
			iy += ds.NumIdentical
			continue
		}

		// Handle unequal group.
		nx := ds.NumIdentical + ds.NumRemoved + ds.NumModified
		ny := ds.NumIdentical + ds.NumInserted + ds.NumModified
		var numLeadingIdentical, numTrailingIdentical int
		for j := 0; j < nx && j < ny && eq(ix+j, iy+j); j++ {
			numLeadingIdentical++
		}
		for j := 0; j < nx && j < ny && eq(ix+nx-1-j, iy+ny-1-j); j++ {
			numTrailingIdentical++
		}
		if numIdentical := numLeadingIdentical + numTrailingIdentical; numIdentical > 0 {
			if numLeadingIdentical > 0 {
				// Remove leading identical span from this group and
				// insert it into the preceding group.
				if i-1 >= 0 {
					groups[i-1].NumIdentical += numLeadingIdentical
				} else {
					// No preceding group exists, so prepend a new group,
					// but do so after we finish iterating over all groups.
					defer func() {
						groups = append([]diffStats{{Name: groups[0].Name, NumIdentical: numLeadingIdentical}}, groups...)
					}()
				}
				// Increment indexes since the preceding group would have handled this.
				ix += numLeadingIdentical
				iy += numLeadingIdentical
			}
			if numTrailingIdentical > 0 {
				// Remove trailing identical span from this group and
				// insert it into the succeeding group.
				if i+1 < len(groups) {
					groups[i+1].NumIdentical += numTrailingIdentical
				} else {
					// No succeeding group exists, so append a new group,
					// but do so after we finish iterating over all groups.
					defer func() {
						groups = append(groups, diffStats{Name: groups[len(groups)-1].Name, NumIdentical: numTrailingIdentical})
					}()
				}
				// Do not increment indexes since the succeeding group will handle this.
			}

			// Update this group since some identical elements were removed.
			nx -= numIdentical
			ny -= numIdentical
			groups[i] = diffStats{Name: ds.Name, NumRemoved: nx, NumInserted: ny}
		}
		ix += nx
		iy += ny
	}
	return groups
}