chikei / zinc-concurrentmodificationexception

sbt run

zinc throws:

[info] running example.MainClass
[info] compiling 1 Java source to C:\Users\Chikei\AppData\Local\Temp\zincClasses336102448129471145 ...
[error] ## Exception when compiling 1 sources to C:\Users\Chikei\AppData\Local\Temp\zincClasses336102448129471145
[error] java.util.ConcurrentModificationException: mutation occurred during iteration
[error] scala.collection.mutable.MutationTracker$.checkMutations(MutationTracker.scala:43)
[error] scala.collection.mutable.MutationTracker$CheckedIterator.hasNext(MutationTracker.scala:59)
[error] scala.collection.IterableOnceOps.foreach(IterableOnce.scala:563)
[error] scala.collection.IterableOnceOps.foreach$(IterableOnce.scala:561)
[error] scala.collection.AbstractIterable.foreach(Iterable.scala:919)
[error] sbt.internal.inc.ClassToAPI$.process(ClassToAPI.scala:34)
[error] sbt.internal.inc.javac.AnalyzingJavaCompiler.readAPI$1(AnalyzingJavaCompiler.scala:180)
[error] sbt.internal.inc.javac.AnalyzingJavaCompiler.$anonfun$compile$23(AnalyzingJavaCompiler.scala:205)
[error] sbt.internal.inc.classfile.JavaAnalyze$.readInheritanceDependencies$1(JavaAnalyze.scala:194)
[error] sbt.internal.inc.classfile.JavaAnalyze$.$anonfun$apply$15(JavaAnalyze.scala:201)
[error] sbt.internal.inc.classfile.JavaAnalyze$.$anonfun$apply$15$adapted(JavaAnalyze.scala:110)
[error] scala.collection.IterableOnceOps.foreach(IterableOnce.scala:563)
[error] scala.collection.IterableOnceOps.foreach$(IterableOnce.scala:561)
[error] scala.collection.AbstractIterable.foreach(Iterable.scala:919)
[error] scala.collection.IterableOps$WithFilter.foreach(Iterable.scala:889)
[error] sbt.internal.inc.classfile.JavaAnalyze$.apply(JavaAnalyze.scala:110)
[error] sbt.internal.inc.javac.AnalyzingJavaCompiler.$anonfun$compile$21(AnalyzingJavaCompiler.scala:205)
[error] sbt.internal.inc.javac.AnalyzingJavaCompiler.$anonfun$compile$21$adapted(AnalyzingJavaCompiler.scala:199)
[error] scala.collection.IterableOnceOps.foreach(IterableOnce.scala:563)
[error] scala.collection.IterableOnceOps.foreach$(IterableOnce.scala:561)
[error] scala.collection.AbstractIterable.foreach(Iterable.scala:919)
[error] scala.collection.IterableOps$WithFilter.foreach(Iterable.scala:889)
[error] sbt.internal.inc.javac.AnalyzingJavaCompiler.$anonfun$compile$19(AnalyzingJavaCompiler.scala:199)
[error] scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)
[error] sbt.internal.inc.javac.AnalyzingJavaCompiler.timed(AnalyzingJavaCompiler.scala:251)
[error] sbt.internal.inc.javac.AnalyzingJavaCompiler.compile(AnalyzingJavaCompiler.scala:199)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compileJava$1(MixedAnalyzingCompiler.scala:98)
[error] scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)
[error] sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:241)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compileJava(MixedAnalyzingCompiler.scala:61)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compileJava0$1(MixedAnalyzingCompiler.scala:191)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:204)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:528)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:528)
[error] sbt.internal.inc.Incremental$.$anonfun$apply$5(Incremental.scala:174)
[error] sbt.internal.inc.Incremental$.$anonfun$apply$5$adapted(Incremental.scala:172)
[error] sbt.internal.inc.Incremental$$anon$2.run(Incremental.scala:457)
[error] sbt.internal.inc.IncrementalCommon$CycleState.next(IncrementalCommon.scala:116)
[error] sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:56)
[error] sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:52)
[error] sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:261)
[error] sbt.internal.inc.Incremental$.$anonfun$incrementalCompile$8(Incremental.scala:412)
[error] sbt.internal.inc.Incremental$.withClassfileManager(Incremental.scala:499)
[error] sbt.internal.inc.Incremental$.incrementalCompile(Incremental.scala:399)
[error] sbt.internal.inc.Incremental$.apply(Incremental.scala:166)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:528)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:482)
[error] sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:332)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:420)
[error] sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:137)
[error] example.MainClass$.delayedEndpoint$example$MainClass$1(MainClass.scala:85)
[error] example.MainClass$delayedInit$body.apply(MainClass.scala:13)
[error] scala.Function0.apply$mcV$sp(Function0.scala:39)
[error] scala.Function0.apply$mcV$sp$(Function0.scala:39)
[error] scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:17)
[error] scala.App.$anonfun$main$1(App.scala:76)
[error] scala.App.$anonfun$main$1$adapted(App.scala:76)
[error] scala.collection.IterableOnceOps.foreach(IterableOnce.scala:563)
[error] scala.collection.IterableOnceOps.foreach$(IterableOnce.scala:561)
[error] scala.collection.AbstractIterable.foreach(Iterable.scala:919)
[error] scala.App.main(App.scala:76)
[error] scala.App.main$(App.scala:74)
[error] example.MainClass$.main(MainClass.scala:13)
[error] example.MainClass.main(MainClass.scala)
[error] sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[error] sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[error] sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[error] java.lang.reflect.Method.invoke(Method.java:498)
[error] sbt.Run.invokeMain(Run.scala:133)
[error] sbt.Run.execute$1(Run.scala:82)
[error] sbt.Run.$anonfun$runWithLoader$5(Run.scala:110)
[error] scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
[error] sbt.util.InterfaceUtil$$anon$1.get(InterfaceUtil.scala:17)
[error] sbt.TrapExit$App.run(TrapExit.scala:258)
[error] java.lang.Thread.run(Thread.java:748)
[error]
[error] (run-main-7) java.util.ConcurrentModificationException: mutation occurred during iteration
[error] java.util.ConcurrentModificationException: mutation occurred during iteration
[error]         at scala.collection.mutable.MutationTracker$.checkMutations(MutationTracker.scala:43)
[error]         at scala.collection.mutable.MutationTracker$CheckedIterator.hasNext(MutationTracker.scala:59)
[error]         at scala.collection.IterableOnceOps.foreach(IterableOnce.scala:563)
[error]         at scala.collection.IterableOnceOps.foreach$(IterableOnce.scala:561)
[error]         at scala.collection.AbstractIterable.foreach(Iterable.scala:919)
[error] stack trace is suppressed; run 'last Compile / bgRun' for the full output
[error] Nonzero exit code: 1
[error] (Compile / run) Nonzero exit code: 1