TypeVariable<?> variable = new TypeParameter<T>() {}.typeVariable;
    TypeVariable<?> expected =
        TypeParameterTest.class.getDeclaredMethod("testCaptureTypeParameter")
            .getTypeParameters()[0];
    assertEquals(expected, variable);
  }

  public void testConcreteTypeRejected() {
    assertThrows(IllegalArgumentException.class, () -> new TypeParameter<String>() {});
  }

     */
    public static String signature(Constructor<?> constructor, boolean addNameParameter) {
        StringBuilder builder = new StringBuilder();
        visitFormalTypeParameters(constructor.getTypeParameters(), builder);
        visitConstructorParameters(constructor.getGenericParameterTypes(), addNameParameter, builder);
        builder.append('V');
        visitExceptions(constructor.getGenericExceptionTypes(), builder);

            Set<Type> methodSet = new HashSet<Type>();
            visit(method.getGenericReturnType(), types, methodSet);
            for (TypeVariable<Method> typeVariable : method.getTypeParameters()) {
                visit(typeVariable, types, methodSet);
            }
        }
    }

    private void visit(Type type, Set<Class<?>> types, Set<Type> preventEndlessRecursiveSet) {