}
				if dir := filepath.Join(exe, "../../.."); isGOROOT(dir) {
					return canonical(dir)
				}
			}
		}
	}
	return def
}

// isSameDir reports whether dir1 and dir2 are the same directory.
func isSameDir(dir1, dir2 string) bool {
	if dir1 == dir2 {
		return true
	}
	info1, err1 := os.Stat(dir1)
	info2, err2 := os.Stat(dir2)