}
	}
	if strings.HasSuffix(info.Name(), ".go") {
		f, err := fsys.Open(filepath.Join(dir, info.Name()))
		if err != nil {
			base.Fatal(err)
		}
		defer f.Close()

		content, err := imports.ReadImports(f, false, nil)
		if err == nil && !imports.ShouldBuild(content, imports.AnyTags()) {
			// The file is explicitly tagged "ignore", so it can't affect the build.
			// Leave it out.
			return false
		}