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scala - 使用 scala 宏时，为什么编译错误堆栈跟踪看起来如此不连贯？

问题描述

我想在一些不可靠的宏上试验 scala。所以我模仿了无形调用中的一个简单错误：

import shapeless.Witness

    val v = Witness(Random.nextInt())

然后我用 编译它gradle build --info --stacktrace，期望找到一个以 'shapeless.Witness' 或类似内容开头的异常。相反，我得到了这个：


> Task :common:compileTestScala
[Error] /home/peng/git-spike/scalaspike/common/src/test/scala/com/tribbloids/spike/shapeless_spike/RefinedType/Creation.scala:12: Expression scala.util.Random.nextInt() does not evaluate to a constant or a stable reference value
one error found

> Task :common:compileTestScala FAILED
5 actionable tasks: 1 executed, 4 up-to-date

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':common:compileTestScala'.
> Compilation failed

* Try:
Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':common:compileTestScala'.
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.lambda$executeIfValid$1(ExecuteActionsTaskExecuter.java:205)
    at org.gradle.internal.Try$Failure.ifSuccessfulOrElse(Try.java:263)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:203)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:184)
    at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:114)
    at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)
    at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:62)
    at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)
    at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:56)
    at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:416)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:406)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:102)
    at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52)
    at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:41)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:372)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:359)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:352)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:338)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.lambda$run$0(DefaultPlanExecutor.java:127)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:191)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.executeNextNode(DefaultPlanExecutor.java:182)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:124)
    at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
    at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
    at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
Caused by: org.gradle.api.internal.tasks.compile.CompilationFailedException: Compilation failed
    at org.gradle.api.internal.tasks.scala.ZincScalaCompiler.execute(ZincScalaCompiler.java:151)
    at org.gradle.api.internal.tasks.scala.ZincScalaCompilerFacade.execute(ZincScalaCompilerFacade.java:47)
    at org.gradle.api.internal.tasks.scala.ZincScalaCompilerFacade.execute(ZincScalaCompilerFacade.java:32)
    at org.gradle.api.internal.tasks.compile.daemon.AbstractDaemonCompiler$CompilerWorkAction.execute(AbstractDaemonCompiler.java:135)
    at org.gradle.workers.internal.DefaultWorkerServer.execute(DefaultWorkerServer.java:63)
    at org.gradle.workers.internal.AbstractClassLoaderWorker$1.create(AbstractClassLoaderWorker.java:47)
    at org.gradle.workers.internal.AbstractClassLoaderWorker$1.create(AbstractClassLoaderWorker.java:41)
    at org.gradle.internal.classloader.ClassLoaderUtils.executeInClassloader(ClassLoaderUtils.java:98)
    at org.gradle.workers.internal.AbstractClassLoaderWorker.executeInClassLoader(AbstractClassLoaderWorker.java:41)
    at org.gradle.workers.internal.IsolatedClassloaderWorker.execute(IsolatedClassloaderWorker.java:49)
    at org.gradle.workers.internal.WorkerDaemonServer.execute(WorkerDaemonServer.java:84)
    at org.gradle.process.internal.worker.request.WorkerAction$1.call(WorkerAction.java:129)
    at org.gradle.process.internal.worker.child.WorkerLogEventListener.withWorkerLoggingProtocol(WorkerLogEventListener.java:41)
    at org.gradle.process.internal.worker.request.WorkerAction.run(WorkerAction.java:126)
    at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
    at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
    at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:182)
    at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:164)
    at org.gradle.internal.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:412)
    ... 3 more
Caused by: Compilation failed
    at sbt.internal.inc.AnalyzingCompiler.call(AnalyzingCompiler.scala:253)
    at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:122)
    at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:95)
    at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4(MixedAnalyzingCompiler.scala:91)
    at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
    at sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:186)
    at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$3(MixedAnalyzingCompiler.scala:82)
    at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$3$adapted(MixedAnalyzingCompiler.scala:77)
    at sbt.internal.inc.JarUtils$.withPreviousJar(JarUtils.scala:215)
    at sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:77)
    at sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:146)
    at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:343)
    at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:343)
    at sbt.internal.inc.Incremental$.doCompile(Incremental.scala:120)
    at sbt.internal.inc.Incremental$.$anonfun$compile$4(Incremental.scala:100)
    at sbt.internal.inc.IncrementalCommon.recompileClasses(IncrementalCommon.scala:180)
    at sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:98)
    at sbt.internal.inc.Incremental$.$anonfun$compile$3(Incremental.scala:102)
    at sbt.internal.inc.Incremental$.manageClassfiles(Incremental.scala:155)
    at sbt.internal.inc.Incremental$.compile(Incremental.scala:92)
    at sbt.internal.inc.IncrementalCompile$.apply(Compile.scala:75)
    at sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:348)
    at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:301)
    at sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:168)
    at sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:248)
    at sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:74)
    at org.gradle.api.internal.tasks.scala.ZincScalaCompiler.execute(ZincScalaCompiler.java:147)
    ... 21 more

这应该如何帮助我？我只能看到 的代码shapeless.Witness，而不是整个sbt.internal.inc.AnalyzingCompiler. 我应该怎么做才能看到可能与实际报告错误的宏相关的错误？

更新 1代表 Dmytro Mitin 我还想附上我的构建配置：

allprojects {

    apply(plugin = "java")
    apply(plugin = "java-library")
    apply(plugin = "scala")

...

    dependencies {

        implementation("org.scala-lang:scala-compiler:${vs.scalaV}")
        implementation("org.scala-lang:scala-library:${vs.scalaV}")
        implementation("org.scala-lang:scala-reflect:${vs.scalaV}")
<vs.scalaV=2.12.11>
... 
<witness is introduced in s submodule>
    }

    tasks {

        val jvmTarget = JavaVersion.VERSION_1_8.toString()

        withType<ScalaCompile> {

            targetCompatibility = jvmTarget

            scalaCompileOptions.loggingLevel = "debug"

            scalaCompileOptions.additionalParameters = listOf(
                    "-encoding", "utf8",
                    "-unchecked",
                    "-deprecation",
                    "-feature",
                    "-Xfatal-warnings",
                    "-Xlog-implicits",
                    "-Yissue-debug"
            )
        }
    }
}

Maven 上的更新 2 ：

[ERROR] /home/peng/git-dev/scala-2.11/datapassports/spookystuff/core/src/test/scala/com/tribbloids/spookystuff/utils/WitnessSpike.scala:11: Expression scala.util.Random.nextInt() does not evaluate to a constant or a stable reference value
[ERROR]   Witness(Random.nextInt())
[ERROR]          ^

...

[ERROR] Failed to execute goal net.alchim31.maven:scala-maven-plugin:3.4.6:testCompile (scala-test-compile-first) on project spookystuff-core: Execution scala-test-compile-first of goal net.alchim31.maven:scala-maven-plugin:3.4.6:testCompile failed.: CompileFailed -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal net.alchim31.maven:scala-maven-plugin:3.4.6:testCompile (scala-test-compile-first) on project spookystuff-core: Execution scala-test-compile-first of goal net.alchim31.maven:scala-maven-plugin:3.4.6:testCompile failed.
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:215)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call (MultiThreadedBuilder.java:190)
    at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call (MultiThreadedBuilder.java:186)
    at java.util.concurrent.FutureTask.run (FutureTask.java:266)
    at java.util.concurrent.Executors$RunnableAdapter.call (Executors.java:511)
    at java.util.concurrent.FutureTask.run (FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:624)
    at java.lang.Thread.run (Thread.java:748)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution scala-test-compile-first of goal net.alchim31.maven:scala-maven-plugin:3.4.6:testCompile failed.
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:148)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call (MultiThreadedBuilder.java:190)
    at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call (MultiThreadedBuilder.java:186)
    at java.util.concurrent.FutureTask.run (FutureTask.java:266)
    at java.util.concurrent.Executors$RunnableAdapter.call (Executors.java:511)
    at java.util.concurrent.FutureTask.run (FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:624)
    at java.lang.Thread.run (Thread.java:748)
Caused by: sbt.compiler.CompileFailed
    at sbt.compiler.AnalyzingCompiler.call (AnalyzingCompiler.scala:111)
    at sbt.compiler.AnalyzingCompiler.compile (AnalyzingCompiler.scala:53)
    at sbt.compiler.AnalyzingCompiler.compile (AnalyzingCompiler.scala:47)
    at sbt.compiler.AggressiveCompile$$anonfun$3$$anonfun$compileScala$1$1.apply$mcV$sp (AggressiveCompile.scala:95)
    at sbt.compiler.AggressiveCompile$$anonfun$3$$anonfun$compileScala$1$1.apply (AggressiveCompile.scala:95)
    at sbt.compiler.AggressiveCompile$$anonfun$3$$anonfun$compileScala$1$1.apply (AggressiveCompile.scala:95)
    at sbt.compiler.AggressiveCompile.sbt$compiler$AggressiveCompile$$timed (AggressiveCompile.scala:168)
    at sbt.compiler.AggressiveCompile$$anonfun$3.compileScala$1 (AggressiveCompile.scala:94)
    at sbt.compiler.AggressiveCompile$$anonfun$3.apply (AggressiveCompile.scala:142)
    at sbt.compiler.AggressiveCompile$$anonfun$3.apply (AggressiveCompile.scala:84)
    at sbt.inc.IncrementalCompile$$anonfun$doCompile$1.apply (Compile.scala:66)
    at sbt.inc.IncrementalCompile$$anonfun$doCompile$1.apply (Compile.scala:64)
    at sbt.inc.IncrementalCommon.cycle (IncrementalCommon.scala:32)
    at sbt.inc.Incremental$$anonfun$1.apply (Incremental.scala:72)
    at sbt.inc.Incremental$$anonfun$1.apply (Incremental.scala:71)
    at sbt.inc.Incremental$.manageClassfiles (Incremental.scala:99)
    at sbt.inc.Incremental$.compile (Incremental.scala:71)
    at sbt.inc.IncrementalCompile$.apply (Compile.scala:54)
    at sbt.compiler.AggressiveCompile.compile2 (AggressiveCompile.scala:159)
    at sbt.compiler.AggressiveCompile.compile1 (AggressiveCompile.scala:68)
    at com.typesafe.zinc.Compiler.compile (Compiler.scala:207)
    at com.typesafe.zinc.Compiler.compile (Compiler.scala:189)
    at com.typesafe.zinc.Compiler.compile (Compiler.scala:180)
    at com.typesafe.zinc.Compiler.compile (Compiler.scala:171)
    at sbt_inc.SbtIncrementalCompiler.compile (SbtIncrementalCompiler.java:94)
    at scala_maven.ScalaCompilerSupport.incrementalCompile (ScalaCompilerSupport.java:320)
    at scala_maven.ScalaCompilerSupport.compile (ScalaCompilerSupport.java:136)
    at scala_maven.ScalaCompilerSupport.doExecute (ScalaCompilerSupport.java:116)
    at scala_maven.ScalaMojoSupport.execute (ScalaMojoSupport.java:574)
    at scala_maven.ScalaTestCompileMojo.execute (ScalaTestCompileMojo.java:50)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call (MultiThreadedBuilder.java:190)
    at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call (MultiThreadedBuilder.java:186)
    at java.util.concurrent.FutureTask.run (FutureTask.java:266)
    at java.util.concurrent.Executors$RunnableAdapter.call (Executors.java:511)
    at java.util.concurrent.FutureTask.run (FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:624)
    at java.lang.Thread.run (Thread.java:748)

哎呀，同样没用。不敢相信我对它寄予厚望。Relevenat 构建插件配置如下所示：

      <plugin>
        <groupId>net.alchim31.maven</groupId>
        <artifactId>scala-maven-plugin</artifactId>
        <version>3.4.6</version>
        <executions>

          <execution>
            <id>scala-compile-first</id>
            <phase>process-resources</phase>
            <goals>
              <goal>compile</goal>
            </goals>
          </execution>
          <execution>
            <id>scala-test-compile-first</id>
            <phase>process-test-resources</phase>
            <goals>
              <goal>testCompile</goal>
            </goals>
          </execution>
          <!--required for publishing to maven central-->
          <execution>
            <id>add-source</id>
            <goals>
              <goal>add-source</goal>
            </goals>
          </execution>
          <execution>
            <id>attach-scaladocs</id>
            <goals>
              <goal>doc-jar</goal>
            </goals>
            <configuration>
              <args>
<!--                see https://github.com/dmlc/xgboost/issues/4000-->
                <arg>-nobootcp</arg>
              </args>
            </configuration>
          </execution>
        </executions>
        <configuration>
          <scalaVersion>${scala.version}</scalaVersion>
          <scalaCompatVersion>${scala.binary.version}</scalaCompatVersion>
          <recompileMode>incremental</recompileMode>
          <!--https://tpolecat.github.io/2017/04/25/scalac-flags.html-->
          <args>
            <arg>-target:jvm-${java.version}</arg>
            <arg>-unchecked</arg>
            <arg>-deprecation</arg>
            <arg>-feature</arg>
            <arg>-g:vars</arg>

            <arg>-encoding</arg>
            <arg>UTF-8</arg>

            <arg>-Xlint</arg>
          </args>
          <javacArgs>
            <javacArg>-source</javacArg>
            <javacArg>${java.version}</javacArg>
            <javacArg>-target</javacArg>
            <javacArg>${java.version}</javacArg>
          </javacArgs>
          <excludes>
            <exclude>**/.ipynb_checkpoints/*</exclude>
          </excludes>
        </configuration>
      </plugin>

更新 3我终于尝试了 sbt，但显然无法启用宏堆栈跟踪选项。这是 sbt 构建文件中的 scalac 配置：

scalacOptions ++= Seq(
  "-unchecked",
  "-deprecation",
  "-feature",
  //                            "-Xfatal-warnings",
  "-Xlint:poly-implicit-overload",
  "-Xlint:option-implicit",
//  "-Xlog-implicits",
//  "-Xlog-implicit-conversions",
  "-Yissue-debug"
)
scalacOptions in (Compile, doc) ++= Seq("-groups")

/** Enable for debugging */
testOptions in Test += Tests.Argument("-oF")

然后它显示的信息甚至比 maven & gradle 还要少：

> run
[warn] Credentials file /home/peng/.bintray/.credentials does not exist
[warn] Credentials file /home/peng/.ivy2/.sbtcredentials does not exist
[info] Compiling 235 Scala sources and 30 Java sources to /home/peng/git-release/spark-nlp/target/scala-2.11/classes...
[error] /home/peng/git-release/spark-nlp/src/main/scala/com/johnsnowlabs/collections/SearchTrie.scala:86: Expression scala.util.Random.nextInt() does not evaluate to a constant or a stable reference value
[error]   Witness(Random.nextInt())
[error]          ^
[warn] /home/peng/git-release/spark-nlp/src/main/scala/com/johnsnowlabs/ml/tensorflow/TensorflowSpell.scala:134: inferred existential type (org.tensorflow.Tensor[?0], org.tensorflow.Tensor[?0], org.tensorflow.Tensor[?0]) forSome { type ?0; type ?0; type ?0 }, which cannot be expressed by wildcards,  should be enabled
... (skipping irrelevant warnings)
[warn] 9 warnings found
[error] one error found
[error] (compile:compileIncremental) Compilation failed
[error] Total time: 5 s, completed 28-Jul-2020 12:44:30 AM
> 
> 
> 
> last run
> 
>

我错过了这些构建系统中的任何东西吗？

标签： scalagradleshapelessscala-macrosscalac

解决方案

其他编译器错误是否为您提供有用的堆栈跟踪？

堆栈跟踪基本上是运行时的事情：您在编译时唯一可以拥有的堆栈跟踪是编译器内的堆栈跟踪（例如sbt.compiler问题中堆栈跟踪中的包）。

一般来说，要调试宏问题，根据问题，您可以：

  • 如果有问题的宏无法扩展，请在调试器中运行 Scala 编译器（有说明）
  • 使用编译器选项转储生成的代码-Ymacro-debug-lite，这将为您提供生成的 Scala 代码和抽象语法树表示；这仅在宏扩展但本身无法编译或出现运行时错误的情况下才有用

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