fix compile err

gopls/internal/hooks/hooks.go

@@ -16,12 +16,7 @@ import (
 func Options(options *settings.Options) {
 	options.LicensesText = licensesText
 	if options.GoDiff {
-		switch options.NewDiff {
-		case "new":
 			options.ComputeEdits = diff.Strings
-		default:
-			options.ComputeEdits = BothDiffs
-		}
 	}
 	options.URLRegexp = xurls.Relaxed()
 	updateAnalyzers(options)

gopls/internal/settings/default.go

@@ -113,7 +113,6 @@ func DefaultOptions(overrides ...func(*Options)) *Options {
 				CompleteUnimported:          true,
 				CompletionDocumentation:     true,
 				DeepCompletion:              true,
-				NewDiff:                     "new",
 				SubdirWatchPatterns:         SubdirWatchPatternsAuto,
 				ReportAnalysisProgressAfter: 5 * time.Second,
 				TelemetryPrompt:             false,

gopls/internal/settings/settings.go

@@ -525,12 +525,6 @@ type InternalOptions struct {
 	// This option applies only during initialization.
 	ShowBugReports bool
 
-	// NewDiff controls the choice of the new diff implementation. It can be
-	// 'new', 'old', or 'both', which is the default. 'both' computes diffs with
-	// both algorithms, checks that the new algorithm has worked, and write some
-	// summary statistics to a file in os.TmpDir().
-	NewDiff string
-
 	// SubdirWatchPatterns configures the file watching glob patterns registered
 	// by gopls.
 	//
@@ -1161,9 +1155,6 @@ func (o *Options) set(name string, value interface{}, seen map[string]struct{})
 		// This setting should be handled before all of the other options are
 		// processed, so do nothing here.
 
-	case "newDiff":
-		result.setString(&o.NewDiff)
-
 	case "subdirWatchPatterns":
 		if s, ok := result.asOneOf(
 			string(SubdirWatchPatternsOn),