Go: Add comment to AnyGoFilesOutsideDirs and use slices.Contains

Author: mbg

go/extractor/util/util.go

@@ -10,6 +10,7 @@ import (
 	"os/exec"
 	"path/filepath"
 	"runtime"
+	"slices"
 	"strings"
 )
 
@@ -319,18 +320,16 @@ func FindAllFilesWithName(root string, name string, dirsToSkip ...string) []stri
 	return paths
 }
 
+// Determines whether there are any Go source files in locations which do not have a Go.mod
+// file in the same directory or higher up in the file hierarchy, relative to the `root`.
 func AnyGoFilesOutsideDirs(root string, dirsToSkip ...string) bool {
 	found := false
 	filepath.WalkDir(root, func(path string, d fs.DirEntry, err error) error {
 		if err != nil {
 			return err
 		}
-		if d.IsDir() {
-			for _, dirToSkip := range dirsToSkip {
-				if path == dirToSkip {
-					return filepath.SkipDir
-				}
-			}
+		if d.IsDir() && slices.Contains(dirsToSkip, path) {
+			return filepath.SkipDir
 		}
 		if filepath.Ext(d.Name()) == ".go" {
 			found = true