Testing unusable with -Ysafe-init

[Swoorup]

Running munit tests using the -Ysafe-init flag crashes the compiler. This should be easy to reproduce on any project with munit test framework. Compiling and running the main build works fine though.

Compiler version

3.0.0-RC2

Repro steps

• Create a dotty project with 3.0.0-RC2
• Add the compiler flag.

    Compile / scalacOptions ++= Seq( "-Ysafe-init") 

• Run test using sbt test

Output (click arrow to expand)

[info] cannot take signature of MethodType(List(c), List(TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class macros)),object blackbox),Context)), MethodType(List(code), List(TypeRef(TermParamRef(c),Tree)), TypeRef(TermParamRef(c),Tree)))
[info] exception occurred while compiling /Users/swoorup.joshi/Downloads/test/src/test/scala/Test1.scala
cannot resolve reference to type c.type.Tree
the classfile defining the type might be missing from the classpath while compiling /Users/swoorup.joshi/Downloads/test/src/test/scala/Test1.scala
[error] ## Exception when compiling 1 sources to /Users/swoorup.joshi/Downloads/test/target/scala-3.0.0-RC2/test-classes
[error] dotty.tools.dotc.core.MissingType: 
[error] dotty.tools.dotc.core.TypeErasure.dotty$tools$dotc$core$TypeErasure$$sigName(TypeErasure.scala:776)
[error] dotty.tools.dotc.core.TypeErasure$.sigName(TypeErasure.scala:204)
[error] dotty.tools.dotc.core.Signature$.apply(Signature.scala:169)
[error] dotty.tools.dotc.core.Types$MethodOrPoly.computeSignature$1(Types.scala:3392)
[error] dotty.tools.dotc.core.Types$MethodOrPoly.signature(Types.scala:3413)
[error] dotty.tools.dotc.core.Types$MethodOrPoly.computeSignature$1(Types.scala:3388)
[error] dotty.tools.dotc.core.Types$MethodOrPoly.signature(Types.scala:3413)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.signature(Denotations.scala:612)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.signature(Denotations.scala:602)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.atSignature(Denotations.scala:644)
[error] dotty.tools.dotc.core.Denotations$SingleDenotation.atSignature(Denotations.scala:642)
[error] dotty.tools.dotc.core.tasty.TreeUnpickler$TreeReader.readLengthTerm$1(TreeUnpickler.scala:1215)
[error] dotty.tools.dotc.core.tasty.TreeUnpickler$TreeReader.readTerm(TreeUnpickler.scala:1289)
[error] dotty.tools.dotc.core.tasty.TreeUnpickler.readRhs$2$$anonfun$2$$anonfun$1(TreeUnpickler.scala:811)
[error] dotty.tools.dotc.core.tasty.TreeUnpickler$LazyReader.complete(TreeUnpickler.scala:1426)
[error] dotty.tools.dotc.ast.Trees$WithLazyField.forceIfLazy(Trees.scala:967)
[error] dotty.tools.dotc.ast.Trees$WithLazyField.forceIfLazy$(Trees.scala:962)
[error] dotty.tools.dotc.ast.Trees$ValOrDefDef.forceIfLazy(Trees.scala:377)
[error] dotty.tools.dotc.ast.Trees$ValOrDefDef.rhs(Trees.scala:382)
[error] dotty.tools.dotc.printing.RefinedPrinter.defDefToText$$anonfun$4$$anonfun$3(RefinedPrinter.scala:860)
[error] dotty.tools.dotc.printing.RefinedPrinter.withEnclosingDef(RefinedPrinter.scala:47)
[error] dotty.tools.dotc.printing.RefinedPrinter.defDefToText$$anonfun$1(RefinedPrinter.scala:861)
[error] dotty.tools.dotc.printing.RefinedPrinter.dclTextOr(RefinedPrinter.scala:783)
[error] dotty.tools.dotc.printing.RefinedPrinter.defDefToText(RefinedPrinter.scala:862)
[error] dotty.tools.dotc.printing.RefinedPrinter.toTextCore(RefinedPrinter.scala:541)
[error] dotty.tools.dotc.printing.RefinedPrinter.toText$$anonfun$2(RefinedPrinter.scala:674)
[error] dotty.tools.dotc.printing.MessageLimiter.controlled(MessageLimiter.scala:23)
[error] dotty.tools.dotc.printing.PlainPrinter.controlled(PlainPrinter.scala:36)
[error] dotty.tools.dotc.printing.RefinedPrinter.toText(RefinedPrinter.scala:745)
[error] dotty.tools.dotc.ast.Trees$Tree.toText(Trees.scala:197)
[error] dotty.tools.dotc.printing.Showable.show(Showable.scala:23)
[error] dotty.tools.dotc.printing.Showable.show$(Showable.scala:9)
[error] dotty.tools.dotc.ast.Trees$Tree.show(Trees.scala:56)
[error] dotty.tools.dotc.transform.init.Checking$.checkClassBodyStat$2(Checking.scala:97)
[error] dotty.tools.dotc.transform.init.Checking$.checkClassBody$$anonfun$3(Checking.scala:173)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.immutable.List.foreach(List.scala:333)
[error] dotty.tools.dotc.transform.init.Checking$.checkClassBody(Checking.scala:173)
[error] dotty.tools.dotc.transform.init.Checking$.checkConstructor$1$$anonfun$1(Checking.scala:123)
[error] dotty.tools.dotc.transform.init.Util$.traceOp(Util.scala:18)
[error] dotty.tools.dotc.transform.init.Checking$.checkConstructor$2(Checking.scala:126)
[error] dotty.tools.dotc.transform.init.Checking$.checkClassBody$$anonfun$2(Checking.scala:169)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.immutable.List.foreach(List.scala:333)
[error] dotty.tools.dotc.transform.init.Checking$.checkClassBody(Checking.scala:170)
[error] dotty.tools.dotc.transform.init.Checking$.checkConstructor$1$$anonfun$1(Checking.scala:123)
[error] dotty.tools.dotc.transform.init.Util$.traceOp(Util.scala:18)
[error] dotty.tools.dotc.transform.init.Checking$.checkConstructor$2(Checking.scala:126)
[error] dotty.tools.dotc.transform.init.Checking$.checkClassBody$$anonfun$2(Checking.scala:169)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.immutable.List.foreach(List.scala:333)
[error] dotty.tools.dotc.transform.init.Checking$.checkClassBody(Checking.scala:170)
[error] dotty.tools.dotc.transform.init.Checking$.checkConstructor$1$$anonfun$1(Checking.scala:123)
[error] dotty.tools.dotc.transform.init.Util$.traceOp(Util.scala:18)
[error] dotty.tools.dotc.transform.init.Checking$.checkConstructor$2(Checking.scala:126)
[error] dotty.tools.dotc.transform.init.Checking$.checkClassBody$$anonfun$2(Checking.scala:164)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.immutable.List.foreach(List.scala:333)
[error] dotty.tools.dotc.transform.init.Checking$.checkClassBody(Checking.scala:170)
[error] dotty.tools.dotc.transform.init.Checker.transformTypeDef(Checker.scala:60)
[error] dotty.tools.dotc.transform.MegaPhase.goTypeDef(MegaPhase.scala:989)
[error] dotty.tools.dotc.transform.MegaPhase.goTypeDef(MegaPhase.scala:990)
[error] dotty.tools.dotc.transform.MegaPhase.transformNamed$1(MegaPhase.scala:257)
[error] dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:427)
[error] dotty.tools.dotc.transform.MegaPhase.transformStat$2(MegaPhase.scala:437)
[error] dotty.tools.dotc.transform.MegaPhase.recur$1(MegaPhase.scala:442)
[error] dotty.tools.dotc.transform.MegaPhase.transformStats(MegaPhase.scala:442)
[error] dotty.tools.dotc.transform.MegaPhase.mapPackage$1(MegaPhase.scala:382)
[error] dotty.tools.dotc.transform.MegaPhase.transformUnnamed$1(MegaPhase.scala:385)
[error] dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:429)
[error] dotty.tools.dotc.transform.MegaPhase.transformUnit(MegaPhase.scala:448)
[error] dotty.tools.dotc.transform.MegaPhase.run(MegaPhase.scala:460)
[error] dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:303)
[error] scala.collection.immutable.List.map(List.scala:246)
[error] dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:304)
[error] dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:205)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
[error] dotty.tools.dotc.Run.runPhases$5(Run.scala:215)
[error] dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:223)
[error] scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)
[error] dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:67)
[error] dotty.tools.dotc.Run.compileUnits(Run.scala:230)
[error] dotty.tools.dotc.Run.compileSources(Run.scala:166)
[error] dotty.tools.dotc.Run.compile(Run.scala:150)
[error] dotty.tools.dotc.Driver.doCompile(Driver.scala:39)
[error] dotty.tools.xsbt.CompilerBridgeDriver.run(CompilerBridgeDriver.java:88)
[error] dotty.tools.xsbt.CompilerBridge.run(CompilerBridge.java:22)
[error] sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:91)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$7(MixedAnalyzingCompiler.scala:186)
[error] scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
[error] sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:241)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4(MixedAnalyzingCompiler.scala:176)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4$adapted(MixedAnalyzingCompiler.scala:157)
[error] sbt.internal.inc.JarUtils$.withPreviousJar(JarUtils.scala:239)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:157)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:204)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:528)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:528)
[error] sbt.internal.inc.Incremental$.$anonfun$apply$5(Incremental.scala:174)
[error] sbt.internal.inc.Incremental$.$anonfun$apply$5$adapted(Incremental.scala:172)
[error] sbt.internal.inc.Incremental$$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$1(IncrementalCompilerImpl.scala:482)
[error] sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:332)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:420)
[error] sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:137)
[error] sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:2346)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$2(Defaults.scala:2303)
[error] sbt.internal.io.Retry$.apply(Retry.scala:46)
[error] sbt.internal.io.Retry$.apply(Retry.scala:28)
[error] sbt.internal.io.Retry$.apply(Retry.scala:23)
[error] sbt.internal.server.BspCompileTask$.compute(BspCompileTask.scala:31)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:2299)
[error] scala.Function1.$anonfun$compose$1(Function1.scala:49)
[error] sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:62)
[error] sbt.std.Transform$$anon$4.work(Transform.scala:68)
[error] sbt.Execute.$anonfun$submit$2(Execute.scala:282)
[error] sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:23)
[error] sbt.Execute.work(Execute.scala:291)
[error] sbt.Execute.$anonfun$submit$1(Execute.scala:282)
[error] sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:265)
[error] sbt.CompletionService$$anon$2.call(CompletionService.scala:64)
[error] java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
[error] java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
[error] java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[error] java.base/java.lang.Thread.run(Thread.java:834)
[error]            
[error] dotty.tools.dotc.core.MissingType: 
[error]         at dotty.tools.dotc.core.TypeErasure.dotty$tools$dotc$core$TypeErasure$$sigName(TypeErasure.scala:776)
[error]         at dotty.tools.dotc.core.TypeErasure$.sigName(TypeErasure.scala:204)
[error]         at dotty.tools.dotc.core.Signature$.apply(Signature.scala:169)
[error]         at dotty.tools.dotc.core.Types$MethodOrPoly.computeSignature$1(Types.scala:3392)
[error]         at dotty.tools.dotc.core.Types$MethodOrPoly.signature(Types.scala:3413)
[error]         at dotty.tools.dotc.core.Types$MethodOrPoly.computeSignature$1(Types.scala:3388)
[error]         at dotty.tools.dotc.core.Types$MethodOrPoly.signature(Types.scala:3413)
[error]         at dotty.tools.dotc.core.Denotations$SingleDenotation.signature(Denotations.scala:612)
[error]         at dotty.tools.dotc.core.Denotations$SingleDenotation.signature(Denotations.scala:602)
[error]         at dotty.tools.dotc.core.Denotations$SingleDenotation.atSignature(Denotations.scala:644)
[error]         at dotty.tools.dotc.core.Denotations$SingleDenotation.atSignature(Denotations.scala:642)
[error]         at dotty.tools.dotc.core.tasty.TreeUnpickler$TreeReader.readLengthTerm$1(TreeUnpickler.scala:1215)
[error]         at dotty.tools.dotc.core.tasty.TreeUnpickler$TreeReader.readTerm(TreeUnpickler.scala:1289)
[error]         at dotty.tools.dotc.core.tasty.TreeUnpickler.readRhs$2$$anonfun$2$$anonfun$1(TreeUnpickler.scala:811)
[error]         at dotty.tools.dotc.core.tasty.TreeUnpickler$LazyReader.complete(TreeUnpickler.scala:1426)
[error]         at dotty.tools.dotc.ast.Trees$WithLazyField.forceIfLazy(Trees.scala:967)
[error]         at dotty.tools.dotc.ast.Trees$WithLazyField.forceIfLazy$(Trees.scala:962)
[error]         at dotty.tools.dotc.ast.Trees$ValOrDefDef.forceIfLazy(Trees.scala:377)
[error]         at dotty.tools.dotc.ast.Trees$ValOrDefDef.rhs(Trees.scala:382)
[error]         at dotty.tools.dotc.printing.RefinedPrinter.defDefToText$$anonfun$4$$anonfun$3(RefinedPrinter.scala:860)
[error]         at dotty.tools.dotc.printing.RefinedPrinter.withEnclosingDef(RefinedPrinter.scala:47)
[error]         at dotty.tools.dotc.printing.RefinedPrinter.defDefToText$$anonfun$1(RefinedPrinter.scala:861)
[error]         at dotty.tools.dotc.printing.RefinedPrinter.dclTextOr(RefinedPrinter.scala:783)
[error]         at dotty.tools.dotc.printing.RefinedPrinter.defDefToText(RefinedPrinter.scala:862)
[error]         at dotty.tools.dotc.printing.RefinedPrinter.toTextCore(RefinedPrinter.scala:541)
[error]         at dotty.tools.dotc.printing.RefinedPrinter.toText$$anonfun$2(RefinedPrinter.scala:674)
[error]         at dotty.tools.dotc.printing.MessageLimiter.controlled(MessageLimiter.scala:23)
[error]         at dotty.tools.dotc.printing.PlainPrinter.controlled(PlainPrinter.scala:36)
[error]         at dotty.tools.dotc.printing.RefinedPrinter.toText(RefinedPrinter.scala:745)
[error]         at dotty.tools.dotc.ast.Trees$Tree.toText(Trees.scala:197)
[error]         at dotty.tools.dotc.printing.Showable.show(Showable.scala:23)
[error]         at dotty.tools.dotc.printing.Showable.show$(Showable.scala:9)
[error]         at dotty.tools.dotc.ast.Trees$Tree.show(Trees.scala:56)
[error]         at dotty.tools.dotc.transform.init.Checking$.checkClassBodyStat$2(Checking.scala:97)
[error]         at dotty.tools.dotc.transform.init.Checking$.checkClassBody$$anonfun$3(Checking.scala:173)
[error]         at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error]         at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error]         at scala.collection.immutable.List.foreach(List.scala:333)
[error]         at dotty.tools.dotc.transform.init.Checking$.checkClassBody(Checking.scala:173)
[error]         at dotty.tools.dotc.transform.init.Checking$.checkConstructor$1$$anonfun$1(Checking.scala:123)
[error]         at dotty.tools.dotc.transform.init.Util$.traceOp(Util.scala:18)
[error]         at dotty.tools.dotc.transform.init.Checking$.checkConstructor$2(Checking.scala:126)
[error]         at dotty.tools.dotc.transform.init.Checking$.checkClassBody$$anonfun$2(Checking.scala:169)
[error]         at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error]         at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error]         at scala.collection.immutable.List.foreach(List.scala:333)
[error]         at dotty.tools.dotc.transform.init.Checking$.checkClassBody(Checking.scala:170)
[error]         at dotty.tools.dotc.transform.init.Checking$.checkConstructor$1$$anonfun$1(Checking.scala:123)
[error]         at dotty.tools.dotc.transform.init.Util$.traceOp(Util.scala:18)
[error]         at dotty.tools.dotc.transform.init.Checking$.checkConstructor$2(Checking.scala:126)
[error]         at dotty.tools.dotc.transform.init.Checking$.checkClassBody$$anonfun$2(Checking.scala:169)
[error]         at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error]         at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error]         at scala.collection.immutable.List.foreach(List.scala:333)
[error]         at dotty.tools.dotc.transform.init.Checking$.checkClassBody(Checking.scala:170)
[error]         at dotty.tools.dotc.transform.init.Checking$.checkConstructor$1$$anonfun$1(Checking.scala:123)
[error]         at dotty.tools.dotc.transform.init.Util$.traceOp(Util.scala:18)
[error]         at dotty.tools.dotc.transform.init.Checking$.checkConstructor$2(Checking.scala:126)
[error]         at dotty.tools.dotc.transform.init.Checking$.checkClassBody$$anonfun$2(Checking.scala:164)
[error]         at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error]         at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error]         at scala.collection.immutable.List.foreach(List.scala:333)
[error]         at dotty.tools.dotc.transform.init.Checking$.checkClassBody(Checking.scala:170)
[error]         at dotty.tools.dotc.transform.init.Checker.transformTypeDef(Checker.scala:60)
[error]         at dotty.tools.dotc.transform.MegaPhase.goTypeDef(MegaPhase.scala:989)
[error]         at dotty.tools.dotc.transform.MegaPhase.goTypeDef(MegaPhase.scala:990)
[error]         at dotty.tools.dotc.transform.MegaPhase.transformNamed$1(MegaPhase.scala:257)
[error]         at dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:427)
[error]         at dotty.tools.dotc.transform.MegaPhase.transformStat$2(MegaPhase.scala:437)
[error]         at dotty.tools.dotc.transform.MegaPhase.recur$1(MegaPhase.scala:442)
[error]         at dotty.tools.dotc.transform.MegaPhase.transformStats(MegaPhase.scala:442)
[error]         at dotty.tools.dotc.transform.MegaPhase.mapPackage$1(MegaPhase.scala:382)
[error]         at dotty.tools.dotc.transform.MegaPhase.transformUnnamed$1(MegaPhase.scala:385)
[error]         at dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:429)
[error]         at dotty.tools.dotc.transform.MegaPhase.transformUnit(MegaPhase.scala:448)
[error]         at dotty.tools.dotc.transform.MegaPhase.run(MegaPhase.scala:460)
[error]         at dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:303)
[error]         at scala.collection.immutable.List.map(List.scala:246)
[error]         at dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:304)
[error]         at dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:205)
[error]         at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error]         at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error]         at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
[error]         at dotty.tools.dotc.Run.runPhases$5(Run.scala:215)
[error]         at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:223)
[error]         at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)
[error]         at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:67)
[error]         at dotty.tools.dotc.Run.compileUnits(Run.scala:230)
[error]         at dotty.tools.dotc.Run.compileSources(Run.scala:166)
[error]         at dotty.tools.dotc.Run.compile(Run.scala:150)
[error]         at dotty.tools.dotc.Driver.doCompile(Driver.scala:39)
[error]         at dotty.tools.xsbt.CompilerBridgeDriver.run(CompilerBridgeDriver.java:88)
[error]         at dotty.tools.xsbt.CompilerBridge.run(CompilerBridge.java:22)
[error]         at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:91)
[error]         at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$7(MixedAnalyzingCompiler.scala:186)
[error]         at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
[error]         at sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:241)
[error]         at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4(MixedAnalyzingCompiler.scala:176)
[error]         at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4$adapted(MixedAnalyzingCompiler.scala:157)
[error]         at sbt.internal.inc.JarUtils$.withPreviousJar(JarUtils.scala:239)
[error]         at sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:157)
[error]         at sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:204)
[error]         at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:528)
[error]         at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:528)
[error]         at sbt.internal.inc.Incremental$.$anonfun$apply$5(Incremental.scala:174)
[error]         at sbt.internal.inc.Incremental$.$anonfun$apply$5$adapted(Incremental.scala:172)
[error]         at sbt.internal.inc.Incremental$$anon$2.run(Incremental.scala:457)
[error]         at sbt.internal.inc.IncrementalCommon$CycleState.next(IncrementalCommon.scala:116)
[error]         at sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:56)
[error]         at sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:52)
[error]         at sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:261)
[error]         at sbt.internal.inc.Incremental$.$anonfun$incrementalCompile$8(Incremental.scala:412)
[error]         at sbt.internal.inc.Incremental$.withClassfileManager(Incremental.scala:499)
[error]         at sbt.internal.inc.Incremental$.incrementalCompile(Incremental.scala:399)
[error]         at sbt.internal.inc.Incremental$.apply(Incremental.scala:166)
[error]         at sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:528)
[error]         at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:482)
[error]         at sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:332)
[error]         at sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:420)
[error]         at sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:137)
[error]         at sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:2346)
[error]         at sbt.Defaults$.$anonfun$compileIncrementalTask$2(Defaults.scala:2303)
[error]         at sbt.internal.io.Retry$.apply(Retry.scala:46)
[error]         at sbt.internal.io.Retry$.apply(Retry.scala:28)
[error]         at sbt.internal.io.Retry$.apply(Retry.scala:23)
[error]         at sbt.internal.server.BspCompileTask$.compute(BspCompileTask.scala:31)
[error]         at sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:2299)
[error]         at scala.Function1.$anonfun$compose$1(Function1.scala:49)
[error]         at sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:62)
[error]         at sbt.std.Transform$$anon$4.work(Transform.scala:68)
[error]         at sbt.Execute.$anonfun$submit$2(Execute.scala:282)
[error]         at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:23)
[error]         at sbt.Execute.work(Execute.scala:291)
[error]         at sbt.Execute.$anonfun$submit$1(Execute.scala:282)
[error]         at sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:265)
[error]         at sbt.CompletionService$$anon$2.call(CompletionService.scala:64)
[error]         at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error]         at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
[error]         at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error]         at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
[error]         at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[error]         at java.base/java.lang.Thread.run(Thread.java:834)
[error] (Test / compileIncremental) dotty.tools.dotc.core.MissingType: 
[error] Total time: 5 s, completed 17 Apr. 2021, 2:24:07 pm

[Swoorup]

Scastie repro: https://scastie.scala-lang.org/s6yBJUHYTTWcFriMly3zOw

[griggt]

Have you observed this issue with other testing frameworks (e.g. ScalaTest, uTest, etc.) or only munit?

[Swoorup]

Have you observed this issue with other testing frameworks (e.g. ScalaTest, uTest, etc.) or only munit?

Looks like its only happening with munit. Just tested uTest. It doesn't have that issue

[griggt]

I suspect it's related to MUnit including Scala 2 macros in the Scala 3 artifact beginning with version 0.7.21.

[griggt]

A standalone reproducer:

Macro.scala

import scala.quoted._
import scala.language.experimental.macros
import scala.reflect.macros.blackbox.Context

class Location(val line: Int)

object MacroCompat {
  trait LocationMacro {
    inline implicit def generate: Location = ${ locationImpl() }
    implicit def generate: Location = macro MacroCompatScala2.locationImpl
  }

  def locationImpl()(using Quotes): Expr[Location] = '{ new Location(${Expr(0)}) }
}

object MacroCompatScala2 {
  def locationImpl(c: Context): c.Tree = {
    import c.universe._
    val line = Literal(Constant(c.enclosingPosition.line))
    New(c.mirror.staticClass(classOf[Location].getName()), line)
  }
}

Test.scala

object Test extends MacroCompat.LocationMacro

$ dotc -version
Scala compiler version 3.0.0-RC2 -- Copyright 2002-2021, LAMP/EPFL

$ dotc -classpath $(cs fetch -p org.scala-lang:scala-reflect:2.13.5) Macro.scala
$ dotc -Ysafe-init Test.scala
cannot take signature of MethodType(List(c), List(TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class macros)),object blackbox),Context)), TypeRef(TermParamRef(c),Tree))
exception occurred while compiling Test.scala
cannot resolve reference to type c.type.Tree
the classfile defining the type might be missing from the classpath while compiling Test.scala
Exception in thread "main" dotty.tools.dotc.core.MissingType: 
	at dotty.tools.dotc.core.TypeErasure.dotty$tools$dotc$core$TypeErasure$$sigName(TypeErasure.scala:776)
	at dotty.tools.dotc.core.TypeErasure$.sigName(TypeErasure.scala:204)
	at dotty.tools.dotc.core.Signature$.apply(Signature.scala:169)
	at dotty.tools.dotc.core.Types$MethodOrPoly.computeSignature$1(Types.scala:3392)
	at dotty.tools.dotc.core.Types$MethodOrPoly.signature(Types.scala:3413)
	at dotty.tools.dotc.core.Denotations$SingleDenotation.signature(Denotations.scala:612)
	at dotty.tools.dotc.core.Denotations$SingleDenotation.signature(Denotations.scala:602)
	at dotty.tools.dotc.core.Denotations$SingleDenotation.atSignature(Denotations.scala:644)
	at dotty.tools.dotc.core.Denotations$SingleDenotation.atSignature(Denotations.scala:642)
	at dotty.tools.dotc.core.tasty.TreeUnpickler$TreeReader.readLengthTerm$1(TreeUnpickler.scala:1215)
	at dotty.tools.dotc.core.tasty.TreeUnpickler$TreeReader.readTerm(TreeUnpickler.scala:1289)
	at dotty.tools.dotc.core.tasty.TreeUnpickler.readRhs$2$$anonfun$2$$anonfun$1(TreeUnpickler.scala:811)
	at dotty.tools.dotc.core.tasty.TreeUnpickler$LazyReader.complete(TreeUnpickler.scala:1426)
	at dotty.tools.dotc.ast.Trees$WithLazyField.forceIfLazy(Trees.scala:967)
	at dotty.tools.dotc.ast.Trees$WithLazyField.forceIfLazy$(Trees.scala:962)
	at dotty.tools.dotc.ast.Trees$ValOrDefDef.forceIfLazy(Trees.scala:377)
	at dotty.tools.dotc.ast.Trees$ValOrDefDef.rhs(Trees.scala:382)
	at dotty.tools.dotc.printing.RefinedPrinter.defDefToText$$anonfun$4$$anonfun$3(RefinedPrinter.scala:860)
	at dotty.tools.dotc.printing.RefinedPrinter.withEnclosingDef(RefinedPrinter.scala:47)
	at dotty.tools.dotc.printing.RefinedPrinter.defDefToText$$anonfun$1(RefinedPrinter.scala:861)
	at dotty.tools.dotc.printing.RefinedPrinter.dclTextOr(RefinedPrinter.scala:783)
	at dotty.tools.dotc.printing.RefinedPrinter.defDefToText(RefinedPrinter.scala:862)
	at dotty.tools.dotc.printing.RefinedPrinter.toTextCore(RefinedPrinter.scala:541)
	at dotty.tools.dotc.printing.RefinedPrinter.toText$$anonfun$2(RefinedPrinter.scala:674)
	at dotty.tools.dotc.printing.MessageLimiter.controlled(MessageLimiter.scala:23)
	at dotty.tools.dotc.printing.PlainPrinter.controlled(PlainPrinter.scala:36)
	at dotty.tools.dotc.printing.RefinedPrinter.toText(RefinedPrinter.scala:745)
	at dotty.tools.dotc.ast.Trees$Tree.toText(Trees.scala:197)
	at dotty.tools.dotc.printing.Showable.show(Showable.scala:23)
	at dotty.tools.dotc.printing.Showable.show$(Showable.scala:9)
	at dotty.tools.dotc.ast.Trees$Tree.show(Trees.scala:56)
	at dotty.tools.dotc.transform.init.Checking$.checkClassBodyStat$2(Checking.scala:97)
	at dotty.tools.dotc.transform.init.Checking$.checkClassBody$$anonfun$3(Checking.scala:173)
	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
	at scala.collection.immutable.List.foreach(List.scala:333)
	at dotty.tools.dotc.transform.init.Checking$.checkClassBody(Checking.scala:173)
	at dotty.tools.dotc.transform.init.Checking$.checkConstructor$1$$anonfun$1(Checking.scala:123)
	at dotty.tools.dotc.transform.init.Util$.traceOp(Util.scala:18)
	at dotty.tools.dotc.transform.init.Checking$.checkConstructor$2(Checking.scala:126)
	at dotty.tools.dotc.transform.init.Checking$.checkClassBody$$anonfun$2(Checking.scala:169)
	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
	at scala.collection.immutable.List.foreach(List.scala:333)
	at dotty.tools.dotc.transform.init.Checking$.checkClassBody(Checking.scala:170)
	at dotty.tools.dotc.transform.init.Checker.transformTypeDef(Checker.scala:60)
	at dotty.tools.dotc.transform.MegaPhase.goTypeDef(MegaPhase.scala:989)
	at dotty.tools.dotc.transform.MegaPhase.goTypeDef(MegaPhase.scala:990)
	at dotty.tools.dotc.transform.MegaPhase.transformNamed$1(MegaPhase.scala:257)
	at dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:427)
	at dotty.tools.dotc.transform.MegaPhase.transformStat$2(MegaPhase.scala:437)
	at dotty.tools.dotc.transform.MegaPhase.recur$1(MegaPhase.scala:442)
	at dotty.tools.dotc.transform.MegaPhase.recur$1(MegaPhase.scala:442)
	at dotty.tools.dotc.transform.MegaPhase.transformStats(MegaPhase.scala:442)
	at dotty.tools.dotc.transform.MegaPhase.mapPackage$1(MegaPhase.scala:382)
	at dotty.tools.dotc.transform.MegaPhase.transformUnnamed$1(MegaPhase.scala:385)
	at dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:429)
	at dotty.tools.dotc.transform.MegaPhase.transformUnit(MegaPhase.scala:448)
	at dotty.tools.dotc.transform.MegaPhase.run(MegaPhase.scala:460)
	at dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:303)
	at scala.collection.immutable.List.map(List.scala:246)
	at dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:304)
	at dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:205)
	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
	at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
	at dotty.tools.dotc.Run.runPhases$5(Run.scala:215)
	at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:223)
	at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)
	at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:67)
	at dotty.tools.dotc.Run.compileUnits(Run.scala:230)
	at dotty.tools.dotc.Run.compileSources(Run.scala:166)
	at dotty.tools.dotc.Run.compile(Run.scala:150)
	at dotty.tools.dotc.Driver.doCompile(Driver.scala:39)
	at dotty.tools.dotc.Driver.process(Driver.scala:199)
	at dotty.tools.dotc.Driver.process(Driver.scala:167)
	at dotty.tools.dotc.Driver.process(Driver.scala:179)
	at dotty.tools.dotc.Driver.main(Driver.scala:209)
	at dotty.tools.dotc.Main.main(Main.scala)

[liufengyun]

Thanks for reporting @Swoorup .

I just tried, it seems to have been fixed in master:

$ coursier fetch -p org.scalameta:munit_3.0.0-RC2:0.7.23
<path-to-jar>
dotty:sbt> scalac -d out -classpath <path-to-jar> munit-test.sala

For 3.0.0-RC2, the dependence on scala-reflect seems to be essential. If that's replaced with a dummy definition, things work fine:

import scala.quoted._
import scala.language.experimental.macros

trait Context: // Dummy scala.reflect.macros.Context
  type Tree = universe.Tree
  val universe: Universe

  trait Universe {
    type Tree >: Null <: AnyRef with TreeApi
    type Literal >: Null <: LiteralApi with TermTree
    type TermTree >: Null <: TermTreeApi with Tree

    trait TermTreeApi extends TreeApi { this: TermTree => }
    trait LiteralApi extends TermTreeApi { this: Literal => }
    trait TreeApi extends Product { this: Tree => }

    type Constant

    type Type

    def Literal(const: Constant): Tree
    def Constant(i: Int): Constant
    def New(tpe: Type, arg: Tree): Tree
  }

  def enclosingPosition: Location

  trait Mirror {
    def staticClass(name: String): universe.Type
  }
  val mirror: Mirror

class Location(val line: Int)

object MacroCompat {
  trait LocationMacro {
    inline implicit def generate: Location = ${ locationImpl() }
    implicit def generate: Location = macro MacroCompatScala2.locationImpl
  }

  def locationImpl()(using Quotes): Expr[Location] = '{ new Location(${Expr(0)}) }
}

object MacroCompatScala2 {
  def locationImpl(c: Context): c.Tree = {
    import c.universe._
    val line = Literal(Constant(c.enclosingPosition.line))
    New(c.mirror.staticClass(classOf[Location].getName()), line)
  }
}

[griggt]

It seems to still blow up on master for me:

$ qdotc -version
Scala compiler version 3.0.1-RC1-bin-SNAPSHOT-git-8086e4b -- Copyright 2002-2021, LAMP/EPFL

$ cat i12128.scala
class Test1 extends munit.FunSuite:
  test("Simple test") {
    assertEquals(1,1)
  }

$ qdotc -Ysafe-init -classpath $(cs fetch -p org.scalameta:munit_3.0.0-RC2:0.7.23) i12128.scala
cannot take signature of MethodType(List(c), List(TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class macros)),object blackbox),Context)), MethodType(List(code), List(TypeRef(TermParamRef(c),Tree)), TypeRef(TermParamRef(c),Tree)))
exception occurred while compiling i12128.scala
cannot resolve reference to type c.type.Tree
< .. same error as in original report ... >

[liufengyun]

Thanks, @griggt, it seems to be the side effect of the PR I am working on.

[liufengyun]

I checked again, it does not happen on master -- probably due to #12495