Dart 生成器：为什么我得到类型 'LibraryDirectiveImpl' 不是类型 'Statement' 的子类型
Dart Generators: Why am I getting type 'LibraryDirectiveImpl' is not a subtype of type 'Statement'
在进入问题之前，我想说这是我第一次尝试在 Dart 上使用生成器，那么，让我们再深入一点。
好吧，我试着按照这个例子：https://github.com/dart-lang/source_gen/tree/master/example
根据我的需要进行更改，顺便说一句，我什至没有 运行 克隆存储库，我收到与 LibraryDirectiveImpl 相关的错误，我不知道如何调试它
可能会发生这种情况，因为我使用 flutter pub run build_runner build 而不是 pub run build_runner build，实际上我想 运行 在 Flutter 项目中这样做。
当我 运行 build_runner 时，我在控制台上遇到了这个问题
You have hit a bug in build_runner
Please file an issue with reproduction steps at https://github.com/dart-lang/build/issues
type 'LibraryDirectiveImpl' is not a subtype of type 'Statement'
package:analyzer/src/summary2/ast_binary_reader.dart 1086:7 AstBinaryReader._read_labeledStatement
package:analyzer/src/summary2/ast_binary_reader.dart 1801:16 AstBinaryReader._readNode
package:analyzer/src/summary2/ast_binary_reader.dart 1914:19 AstBinaryReader._readNodeList
package:analyzer/src/summary2/ast_binary_reader.dart 357:21 AstBinaryReader._read_compilationUnit
package:analyzer/src/summary2/ast_binary_reader.dart 1699:16 AstBinaryReader._readNode
package:analyzer/src/summary2/ast_binary_reader.dart 59:14 AstBinaryReader.readNode
package:analyzer/src/summary2/linked_unit_context.dart 1040:26 LinkedUnitContext._ensureUnitWithDeclarations
package:analyzer/src/summary2/linked_unit_context.dart 91:5 LinkedUnitContext.unit_withDeclarations
package:analyzer/src/summary2/linked_element_factory.dart 307:27 _ElementRequest._createLibraryElement
package:analyzer/src/summary2/linked_element_factory.dart 147:14 _ElementRequest.elementOfReference
package:analyzer/src/summary2/linked_element_factory.dart 72:45 LinkedElementFactory.elementOfReference
package:analyzer/src/summary2/linked_element_factory.dart 104:12 LinkedElementFactory.libraryOfUri
package:analyzer/src/summary2/link.dart 213:34 Linker._createTypeSystem
package:analyzer/src/summary2/link.dart 98:5 Linker._buildOutlines
package:analyzer/src/summary2/link.dart 83:5 Linker.link
package:analyzer/src/summary2/link.dart 35:10 link
package:analyzer/src/dart/analysis/library_context.dart 318:26 LibraryContext.load2.loadBundle
dart:collection __CompactLinkedHashSet&_HashFieldBase&_HashBase&_OperatorEqualsAndHashCode&SetMixin.forEach
package:analyzer/src/dart/analysis/library_context.dart 273:32 LibraryContext.load2.loadBundle
package:analyzer/src/dart/analysis/library_context.dart 370:17 LibraryContext.load2.<fn>
package:analyzer/src/dart/analysis/performance_logger.dart 34:15 PerformanceLog.run
package:analyzer/src/dart/analysis/library_context.dart 368:12 LibraryContext.load2
package:analyzer/src/dart/analysis/library_context.dart 95:7 new LibraryContext
package:analyzer/src/dart/analysis/driver.dart 1439:29 AnalysisDriver._createLibraryContext
package:analyzer/src/dart/analysis/driver.dart 1380:28 AnalysisDriver._computeUnitElement.<fn>
package:analyzer/src/dart/analysis/performance_logger.dart 34:15 PerformanceLog.run
package:analyzer/src/dart/analysis/driver.dart 1378:20 AnalysisDriver._computeUnitElement
package:analyzer/src/dart/analysis/driver.dart 997:34 AnalysisDriver.performWork
package:analyzer/src/dart/analysis/driver.dart 1931:24 AnalysisDriverScheduler._run
package:analyzer/src/dart/analysis/driver.dart 1865:5 AnalysisDriverScheduler.start
package:build_resolvers/src/analysis_driver.dart 54:13 analysisDriver
package:build_resolvers/src/resolver.dart 138:18 new AnalyzerResolvers
package:build_runner_core/src/generate/options.dart 193:19 BuildOptions.create
package:build_runner/src/generate/build.dart 85:36 build
package:build_runner/src/entrypoint/build.dart 28:24 BuildCommand.run
package:args/command_runner.dart 197:27 CommandRunner.runCommand
package:args/command_runner.dart 112:25 CommandRunner.run.<fn>
dart:async new Future.sync
package:args/command_runner.dart 112:14 CommandRunner.run
package:build_runner/src/entrypoint/run.dart 24:31 run
.dart_tool\build\entrypoint\build.dart 31:22 main
pub failed (1)
扑博士
[√] Flutter (Channel stable, v1.7.8+hotfix.4, on Microsoft Windows [Version 10.0.17763.737], locale en-US)
• Flutter version 1.7.8+hotfix.4 at C:\Flutter
• Framework revision 20e59316b8 (9 weeks ago), 2019-07-18 20:04:33 -0700
• Engine revision fee001c93f
• Dart version 2.4.0
[√] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
• Android SDK at c:\Users\hj_ju\AppData\Local\Android\Sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-28, build-tools 28.0.3
• ANDROID_HOME = c:\Users\hj_ju\AppData\Local\Android\Sdk
• Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)
• All Android licenses accepted.
[√] Android Studio (version 3.5)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin version 39.0.3
• Dart plugin version 191.8423
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)
[!] IntelliJ IDEA Ultimate Edition (version 2019.1)
• IntelliJ at C:\Program Files\JetBrains\IntelliJ IDEA 2019.1.2
X Flutter plugin not installed; this adds Flutter specific functionality.
X Dart plugin not installed; this adds Dart specific functionality.
• For information about installing plugins, see
https://flutter.dev/intellij-setup/#installing-the-plugins
[√] VS Code (version 1.38.1)
• VS Code at C:\Users\hj_ju\AppData\Local\Programs\Microsoft VS Code
• Flutter extension version 3.4.1
[!] Connected device
! No devices available
! Doctor found issues in 2 categories.
我今天使用 json_serializable 时收到相同的错误消息。
最后，我从 here 中找到了一个解决方案 (downgrade the package 'analyzer' version from 0.38.3 to 0.38.2)，它有效。
dependencies:
//analyzer: ^0.38.2
analyzer: 0.38.2
祝你好运！
在进入问题之前，我想说这是我第一次尝试在 Dart 上使用生成器，那么，让我们再深入一点。
好吧，我试着按照这个例子：https://github.com/dart-lang/source_gen/tree/master/example 根据我的需要进行更改，顺便说一句，我什至没有 运行 克隆存储库，我收到与 LibraryDirectiveImpl 相关的错误，我不知道如何调试它
可能会发生这种情况，因为我使用 flutter pub run build_runner build 而不是 pub run build_runner build，实际上我想 运行 在 Flutter 项目中这样做。
当我 运行 build_runner 时，我在控制台上遇到了这个问题
You have hit a bug in build_runner
Please file an issue with reproduction steps at https://github.com/dart-lang/build/issues
type 'LibraryDirectiveImpl' is not a subtype of type 'Statement'
package:analyzer/src/summary2/ast_binary_reader.dart 1086:7 AstBinaryReader._read_labeledStatement
package:analyzer/src/summary2/ast_binary_reader.dart 1801:16 AstBinaryReader._readNode
package:analyzer/src/summary2/ast_binary_reader.dart 1914:19 AstBinaryReader._readNodeList
package:analyzer/src/summary2/ast_binary_reader.dart 357:21 AstBinaryReader._read_compilationUnit
package:analyzer/src/summary2/ast_binary_reader.dart 1699:16 AstBinaryReader._readNode
package:analyzer/src/summary2/ast_binary_reader.dart 59:14 AstBinaryReader.readNode
package:analyzer/src/summary2/linked_unit_context.dart 1040:26 LinkedUnitContext._ensureUnitWithDeclarations
package:analyzer/src/summary2/linked_unit_context.dart 91:5 LinkedUnitContext.unit_withDeclarations
package:analyzer/src/summary2/linked_element_factory.dart 307:27 _ElementRequest._createLibraryElement
package:analyzer/src/summary2/linked_element_factory.dart 147:14 _ElementRequest.elementOfReference
package:analyzer/src/summary2/linked_element_factory.dart 72:45 LinkedElementFactory.elementOfReference
package:analyzer/src/summary2/linked_element_factory.dart 104:12 LinkedElementFactory.libraryOfUri
package:analyzer/src/summary2/link.dart 213:34 Linker._createTypeSystem
package:analyzer/src/summary2/link.dart 98:5 Linker._buildOutlines
package:analyzer/src/summary2/link.dart 83:5 Linker.link
package:analyzer/src/summary2/link.dart 35:10 link
package:analyzer/src/dart/analysis/library_context.dart 318:26 LibraryContext.load2.loadBundle
dart:collection __CompactLinkedHashSet&_HashFieldBase&_HashBase&_OperatorEqualsAndHashCode&SetMixin.forEach
package:analyzer/src/dart/analysis/library_context.dart 273:32 LibraryContext.load2.loadBundle
package:analyzer/src/dart/analysis/library_context.dart 370:17 LibraryContext.load2.<fn>
package:analyzer/src/dart/analysis/performance_logger.dart 34:15 PerformanceLog.run
package:analyzer/src/dart/analysis/library_context.dart 368:12 LibraryContext.load2
package:analyzer/src/dart/analysis/library_context.dart 95:7 new LibraryContext
package:analyzer/src/dart/analysis/driver.dart 1439:29 AnalysisDriver._createLibraryContext
package:analyzer/src/dart/analysis/driver.dart 1380:28 AnalysisDriver._computeUnitElement.<fn>
package:analyzer/src/dart/analysis/performance_logger.dart 34:15 PerformanceLog.run
package:analyzer/src/dart/analysis/driver.dart 1378:20 AnalysisDriver._computeUnitElement
package:analyzer/src/dart/analysis/driver.dart 997:34 AnalysisDriver.performWork
package:analyzer/src/dart/analysis/driver.dart 1931:24 AnalysisDriverScheduler._run
package:analyzer/src/dart/analysis/driver.dart 1865:5 AnalysisDriverScheduler.start
package:build_resolvers/src/analysis_driver.dart 54:13 analysisDriver
package:build_resolvers/src/resolver.dart 138:18 new AnalyzerResolvers
package:build_runner_core/src/generate/options.dart 193:19 BuildOptions.create
package:build_runner/src/generate/build.dart 85:36 build
package:build_runner/src/entrypoint/build.dart 28:24 BuildCommand.run
package:args/command_runner.dart 197:27 CommandRunner.runCommand
package:args/command_runner.dart 112:25 CommandRunner.run.<fn>
dart:async new Future.sync
package:args/command_runner.dart 112:14 CommandRunner.run
package:build_runner/src/entrypoint/run.dart 24:31 run
.dart_tool\build\entrypoint\build.dart 31:22 main
pub failed (1)
扑博士
[√] Flutter (Channel stable, v1.7.8+hotfix.4, on Microsoft Windows [Version 10.0.17763.737], locale en-US)
• Flutter version 1.7.8+hotfix.4 at C:\Flutter
• Framework revision 20e59316b8 (9 weeks ago), 2019-07-18 20:04:33 -0700
• Engine revision fee001c93f
• Dart version 2.4.0
[√] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
• Android SDK at c:\Users\hj_ju\AppData\Local\Android\Sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-28, build-tools 28.0.3
• ANDROID_HOME = c:\Users\hj_ju\AppData\Local\Android\Sdk
• Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)
• All Android licenses accepted.
[√] Android Studio (version 3.5)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin version 39.0.3
• Dart plugin version 191.8423
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)
[!] IntelliJ IDEA Ultimate Edition (version 2019.1)
• IntelliJ at C:\Program Files\JetBrains\IntelliJ IDEA 2019.1.2
X Flutter plugin not installed; this adds Flutter specific functionality.
X Dart plugin not installed; this adds Dart specific functionality.
• For information about installing plugins, see
https://flutter.dev/intellij-setup/#installing-the-plugins
[√] VS Code (version 1.38.1)
• VS Code at C:\Users\hj_ju\AppData\Local\Programs\Microsoft VS Code
• Flutter extension version 3.4.1
[!] Connected device
! No devices available
! Doctor found issues in 2 categories.
我今天使用 json_serializable 时收到相同的错误消息。
最后，我从 here 中找到了一个解决方案 (downgrade the package 'analyzer' version from 0.38.3 to 0.38.2)，它有效。
dependencies:
//analyzer: ^0.38.2
analyzer: 0.38.2
祝你好运！