Avoid the empty slice bug

internal/plumbing/tree_diff.go

@@ -139,7 +139,7 @@ func (treediff *TreeDiff) Consume(deps map[string]interface{}) (map[string]inter
 
 	if len(treediff.SkipDirs) > 0 {
 		// filter without allocation
-		filteredDiff := diff[:0]
+		filteredDiff := make([]*object.Change, 0, len(diff))
 	OUTER:
 		for _, change := range diff {
 			for _, dir := range treediff.SkipDirs {

leaves/comment_sentiment.go

@@ -309,7 +309,7 @@ func (sent *CommentSentimentAnalysis) mergeComments(nodes []*uast.Node) []string
 		lineNums = append(lineNums, line)
 	}
 	sort.Ints(lineNums)
-	buffer := []string{}
+	var buffer []string
 	for i, line := range lineNums {
 		lineNodes := lines[line]
 		maxEnd := line
@@ -326,7 +326,7 @@ func (sent *CommentSentimentAnalysis) mergeComments(nodes []*uast.Node) []string
 			continue
 		}
 		mergedComments = append(mergedComments, strings.Join(buffer, "\n"))
-		buffer = buffer[:0]
+		buffer = make([]string, 0, len(buffer))
 	}
 	// We remove unneeded chars and filter too short comments
 	filteredComments := make([]string, 0, len(mergedComments))