toPath = "GOPATH"
				}
			} else if m.Dir == "" {
				// The module is in the vendor directory. Replace the entire vendor
				// directory path, because the module's Dir is not filled in.
				from = modload.VendorDir()
				toPath = "vendor"
			} else {
				from = m.Dir
				toPath = m.Path
				if m.Version != "" {
					toPath += "@" + m.Version
				}
			}