NNBD: Dart2JS crashes with Assertion failure: Unexpected type literal TypeLiteral()

[iarkh]

co19/LanguageFeatures/nnbd/overriding/override_checking_A06_t119 test fails with Assertion failure with dart2js.

This error is not reproducible in other testing modes.

Here is a link to the log file.

Here is a sample output:

> | dart2js-hostasserts-strong-linux-x64-chrome:co19/LanguageFeatures/nnbd/overriding/override_checking_A06_t119 is new and failed (Crash, expected Pass) |
> \=======================================================================================================================================================/
> 
> --- Command "dart2js" (took 01.000747s):
> DART_CONFIGURATION=ReleaseX64NNBD sdk_nnbd/bin/dart2js_developer --enable-experiment=non-nullable --enable-experiment=non-nullable --test-mode --packages=/b/s/w/ir/.packages /b/s/w/ir/tests/co19/src/LanguageFeatures/nnbd/overriding/override_checking_A06_t119.dart --null-safety --libraries-spec=sdk_nnbd/lib/libraries.json --platform-binaries=out/ReleaseX64NNBD/ --out=/b/s/w/ir/out/ReleaseX64NNBD/generated_compilations/dart2js/tests_co19_src_LanguageFeatures_nnbd_overriding_override_checking_A06_t119/override_checking_A06_t119.js
> 
> exit code:
> 253
> 
> stdout:
> tests/co19/src/LanguageFeatures/nnbd/overriding/override_checking_A06_t119.dart:26:8:
> Internal Error: Unexpected type literal TypeLiteral().
>   void test() { Expect.equals(Never, T); }
>        ^
> The compiler is broken.
> 
> When compiling the above element, the compiler crashed. It is not
> possible to tell if this is caused by a problem in your program or
> not. Regardless, the compiler should not crash.
> 
> The Dart team would greatly appreciate if you would take a moment to
> report this problem at http://dartbug.com/new.
> 
> Please include the following information:
> 
> * the name and version of your operating system,
> 
> * the Dart SDK build number (build number could not be determined), and
> 
> * the entire message you see here (including the full stack trace
>   below as well as the source location above).
> 
> stderr:
> Unhandled exception:
> Assertion failure: Unexpected type literal TypeLiteral().
> #0      failedAt (package:compiler/src/diagnostics/invariant.dart:49:3)
> #1      KernelSsaGraphBuilder.visitTypeLiteral (package:compiler/src/ssa/builder_kernel.dart:3348:9)
> #2      TypeLiteral.accept (package:kernel/ast.dart:4852:44)
> #3      KernelSsaGraphBuilder._visitPositionalArguments (package:compiler/src/ssa/builder_kernel.dart:3616:16)
> #4      KernelSsaGraphBuilder._visitArgumentsForStaticTarget (package:compiler/src/ssa/builder_kernel.dart:3743:33)
> #5      KernelSsaGraphBuilder.visitStaticInvocation (package:compiler/src/ssa/builder_kernel.dart:3827:11)
> #6      StaticInvocation.accept (package:kernel/ast.dart:3898:44)
> #7      KernelSsaGraphBuilder.visitExpressionStatement (package:compiler/src/ssa/builder_kernel.dart:1783:18)
> #8      ExpressionStatement.accept (package:kernel/ast.dart:5412:43)
> #9      KernelSsaGraphBuilder.visitBlock (package:compiler/src/ssa/builder_kernel.dart:1749:17)
> #10     Block.accept (package:kernel/ast.dart:5450:43)
> #11     KernelSsaGraphBuilder._visitInlinedFunction (package:compiler/src/ssa/builder_kernel.dart:6297:30)
> #12     KernelSsaGraphBuilder._doInline (package:compiler/src/ssa/builder_kernel.dart:6275:5)
> #13     KernelSsaGraphBuilder._tryInlineMethod.doInlining.<anonymous closure> (package:compiler/src/ssa/builder_kernel.dart:5950:11)
> #14     KernelSsaGraphBuilder._inlinedFrom.<anonymous closure> (package:compiler/src/ssa/builder_kernel.dart:960:21)
> #15     CompilerDiagnosticReporter.withCurrentElement (package:compiler/src/compiler.dart:743:15)
> #16     KernelSsaGraphBuilder._inlinedFrom (package:compiler/src/ssa/builder_kernel.dart:958:14)
> #17     KernelSsaGraphBuilder._tryInlineMethod.doInlining (package:compiler/src/ssa/builder_kernel.dart:5946:7)
> #18     KernelSsaGraphBuilder._tryInlineMethod (package:compiler/src/ssa/builder_kernel.dart:5957:17)
> #19     KernelSsaGraphBuilder._pushDynamicInvocation (package:compiler/src/ssa/builder_kernel.dart:4939:11)
> #20     KernelSsaGraphBuilder.visitMethodInvocation (package:compiler/src/ssa/builder_kernel.dart:5161:5)
> #21     MethodInvocation.accept (package:kernel/ast.dart:3766:44)
> #22     KernelSsaGraphBuilder.visitExpressionStatement (package:compiler/src/ssa/builder_kernel.dart:1783:18)
> #23     ExpressionStatement.accept (package:kernel/ast.dart:5412:43)
> #24     KernelSsaGraphBuilder.visitBlock (package:compiler/src/ssa/builder_kernel.dart:1749:17)
> #25     Block.accept (package:kernel/ast.dart:5450:43)
> #26     KernelSsaGraphBuilder._buildFunctionNode (package:compiler/src/ssa/builder_kernel.dart:1344:23)
> #27     KernelSsaGraphBuilder.build.<anonymous closure> (package:compiler/src/ssa/builder_kernel.dart:466:15)
> #28     CompilerDiagnosticReporter.withCurrentElement (package:compiler/src/compiler.dart:743:15)
> #29     KernelSsaGraphBuilder.build (package:compiler/src/ssa/builder_kernel.dart:451:21)
> #30     KernelSsaBuilder.build.<anonymous closure> (package:compiler/src/js_model/js_strategy.dart:516:22)
> #31     CompilerTask.measure (package:compiler/src/common/tasks.dart:64:51)
> #32     KernelSsaBuilder.build (package:compiler/src/js_model/js_strategy.dart:498:18)
> #33     SsaBuilderTask.build (package:compiler/src/ssa/ssa.dart:356:21)
> #34     SsaFunctionCompiler.compile (package:compiler/src/ssa/ssa.dart:80:29)
> #35     OnDemandCodegenResults.getCodegenResults (package:compiler/src/common/codegen.dart:453:30)
> #36     JsBackendStrategy.generateCode (package:compiler/src/js_model/js_strategy.dart:334:43)
> #37     KernelCodegenWorkItem.run (package:compiler/src/js_model/js_strategy.dart:465:29)
> #38     Compiler.emptyQueue.<anonymous closure>.<anonymous closure>.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:compiler/src/compiler.dart:460:70)
> #39     CompilerTask.measureSubtask (package:compiler/src/common/tasks.dart:179:35)
> #40     Compiler.emptyQueue.<anonymous closure>.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:compiler/src/compiler.dart:460:32)
> #41     CompilerTask.measureSubtask (package:compiler/src/common/tasks.dart:179:35)
> #42     Compiler.emptyQueue.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:compiler/src/compiler.dart:458:28)
> #43     CompilerDiagnosticReporter.withCurrentElement (package:compiler/src/compiler.dart:743:15)
> #44     Compiler.emptyQueue.<anonymous closure>.<anonymous closure> (package:compiler/src/compiler.dart:456:18)
> #45     CodegenEnqueuer._forEach (package:compiler/src/js_backend/enqueuer.dart:266:12)
> #46     CodegenEnqueuer.forEach (package:compiler/src/js_backend/enqueuer.dart:282:5)
> #47     Compiler.emptyQueue.<anonymous closure> (package:compiler/src/compiler.dart:452:16)
> #48     CompilerTask.measureSubtask (package:compiler/src/common/tasks.dart:179:35)
> #49     Compiler.emptyQueue (package:compiler/src/compiler.dart:451:14)
> #50     Compiler.processQueue.<anonymous closure> (package:compiler/src/compiler.dart:477:7)
> #51     CompilerTask.measureSubtask (package:compiler/src/common/tasks.dart:179:35)
> #52     Compiler.processQueue (package:compiler/src/compiler.dart:470:14)
> #53     Compiler.runCodegenEnqueuer (package:compiler/src/compiler.dart:382:5)
> #54     Compiler.generateJavaScriptCode (package:compiler/src/compiler.dart:284:9)
> #55     Compiler.compileFromKernel.<anonymous closure> (package:compiler/src/compiler.dart:432:9)
> #56     CompilerTask.measureSubtask (package:compiler/src/common/tasks.dart:179:35)
> #57     Compiler.compileFromKernel (package:compiler/src/compiler.dart:405:14)
> #58     Compiler.runInternal (package:compiler/src/compiler.dart:257:13)
> <asynchronous suspension>
> #59     Compiler.run.<anonymous closure>.<anonymous closure> (package:compiler/src/compiler.dart:212:38)
> #60     new Future.sync (dart:async/future.dart:222:31)
> #61     Compiler.run.<anonymous closure> (package:compiler/src/compiler.dart:212:20)
> #62     CompilerTask.measureSubtask (package:compiler/src/common/tasks.dart:179:35)
> #63     Compiler.run (package:compiler/src/compiler.dart:209:41)
> #64     CompilerImpl.run.<anonymous closure>.<anonymous closure> (package:compiler/src/apiimpl.dart:91:22)
> #65     _RootZone.runUnary (dart:async/zone.dart:1450:54)
> #66     _FutureListener.handleValue (dart:async/future_impl.dart:143:18)
> #67     Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:692:45)
> #68     Future._propagateToListeners (dart:async/future_impl.dart:721:32)
> #69     Future._completeWithValue (dart:async/future_impl.dart:529:5)
> #70     Future._asyncComplete.<anonymous closure> (dart:async/future_impl.dart:563:7)
> #71     _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
> #72     _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
> #73     _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:117:13)
> #74     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:5)
>