// that does exist does not actually contain the package.
func isNoSuchPackageVersion(err error) bool {
	var noPackage *modload.PackageNotInModuleError
	return isNoSuchModuleVersion(err) || errors.As(err, &noPackage)

//
// Notes on the layout of global symbol index space:
//
//   - Go object files are read before host object files; each Go object
//     read adds its defined package symbols to the global index space.
//     Nonpackage symbols are not yet added.
//
//   - In loader.LoadNonpkgSyms, add non-package defined symbols and
//     references in all object files to the global index space.
//