不良状态：意外诊断：颤振升级到 1.20.1 后答案

【问题标题】：Bad state: Unexpected diagnostics: after flutter upgrade to 1.20.1不良状态：意外诊断：颤振升级到 1.20.1 后
【发布时间】：2020-12-02 00:44:30
【问题描述】：

有什么问题？

xxx@xxx-Inspiron-14-3467:~/xxx$ flutter pub run build_runner build[INFO] Generating build script...
[INFO] Generating build script completed, took 406ms

[WARNING] Deleted previous snapshot due to missing asset graph.
[INFO] Creating build script snapshot......
[INFO] Creating build script snapshot... completed, took 14.6s

[INFO] Initializing inputs
[INFO] Building new asset graph...
[INFO] Building new asset graph completed, took 773ms

[INFO] Checking for unexpected pre-existing outputs....
[INFO] Checking for unexpected pre-existing outputs. completed, took 1ms

[INFO] Running build...
[INFO] Generating SDK summary...
[SEVERE] chopper_generator:chopper_generator on test/widget_test.dart:

Bad state: Unexpected diagnostics:
/home/xxx/Desktop/flutter_linux_1.20.1-stable/flutter/bin/cache/dart-sdk/lib/core/uri.dart:3259:39 - Expected an identifier.
[SEVERE] chopper_generator:chopper_generator on test/widget_test.dart:

Bad state: Unexpected diagnostics:
/home/xxx/Desktop/flutter_linux_1.20.1-stable/flutter/bin/cache/dart-sdk/lib/core/uri.dart:3259:39 - Expected an identifier.
[INFO] 1.6s elapsed, 1/17 actions completed.
[INFO] 2.7s elapsed, 1/17 actions completed.
[INFO] 3.8s elapsed, 1/17 actions completed.
[INFO] 4.9s elapsed, 1/17 actions completed.
[INFO] 6.0s elapsed, 1/17 actions completed.
[INFO] 7.1s elapsed, 1/17 actions completed.
[INFO] 8.2s elapsed, 1/17 actions completed.
[INFO] 9.3s elapsed, 1/17 actions completed.
[INFO] 10.4s elapsed, 1/17 actions completed.
[INFO] 11.5s elapsed, 1/17 actions completed.
[INFO] 12.6s elapsed, 1/17 actions completed.
[INFO] 13.7s elapsed, 1/17 actions completed.
[INFO] 14.8s elapsed, 1/17 actions completed.
[WARNING] No actions completed for 15.1s, waiting on:
  - chopper_generator:chopper_generator on lib/repository/model/radio_model.dart
  - chopper_generator:chopper_generator on lib/repository/model/xxx.dart
  - chopper_generator:chopper_generator on lib/repository/model/time.dart
  - chopper_generator:chopper_generator on lib/repository/model/assign_to.dart
  - chopper_generator:chopper_generator on lib/repository/model/defect_cases_count.dart
  .. and 11 more

【问题讨论】：

github.com/flutter/flutter/issues/63556

标签： flutter dart chopper

【解决方案1】：

花了3个多小时，终于解决了。

对于已经升级到flutter 1.20.1或以上版本的用户，请务必在pubspec.yaml中添加这一行。

dependency_overrides:
  analyzer: '0.39.14'

【讨论】：

【解决方案2】：

我遇到了同样的问题：

请在您的 pubspec 文件中尝试此操作

dependency_overrides:
  analyzer: '0.39.17'    
  build_resolvers: '1.3.10'

【讨论】：

只是 analyzer: ^0.39.17 直接在 dev_dependecies 为我工作

【解决方案3】：

试试看：

1-flutter clean

2- 继续开发频道：flutter channel dev

3-升级：flutter upgrade --force

4-flutter pub get

5- 尝试构建

6- 回到稳定或主频道：flutter channel stable (flutter channel master)

7-升级：flutter upgrade --force

【讨论】：

【解决方案4】：

我遇到了同样的问题，如果接受的答案没有解决您的问题，您可以尝试this issue 中描述的程序：

flutter clean
flutter pub get
flutter packages upgrade

【讨论】：