}
		if t.Name == "string" {
			return !top
		}
		if t.Name == "error" {
			return true
		}
		if goTypes[t.Name] != nil {
			return false
		}
		// We can't figure out the type. Conservative
		// approach is to assume it has a pointer.
		return true
	case *ast.SelectorExpr:
		if l, ok := t.X.(*ast.Ident); !ok || l.Name != "C" {
			// Type defined in a different package.