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Hello, just tried the new backend 1.4.31 on my pro...
# jvm-ir-backend-feedback
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Hello, just tried the new backend 1.4.31 on my project => build failed. Below the stack trace and attaching the source file on which it seems to have crashed. I do not have a simple way to reproduce available. 
[ERROR] org.jetbrains.kotlin.backend.common.BackendException: Backend Internal error: Exception during IR lowering
File being compiled: /Users/emmanuel/Documents/code/janngo/janngoship/src/main/kotlin/com/janngo/jpay/repo/sec/JpayUserRepo.kt
The root cause java.lang.IndexOutOfBoundsException was thrown at: com.intellij.util.text.CharSequenceSubSequence.<init>(CharSequenceSubSequence.java:20)
at org.jetbrains.kotlin.backend.common.CodegenUtil.reportBackendException(CodegenUtil.kt:239)
at org.jetbrains.kotlin.backend.common.CodegenUtil.reportBackendException$default(CodegenUtil.kt:235)
at org.jetbrains.kotlin.backend.common.phaser.PerformByIrFilePhase.invoke(PhaseBuilders.kt:124)
at org.jetbrains.kotlin.backend.common.phaser.PerformByIrFilePhase.invoke(PhaseBuilders.kt:112)
at org.jetbrains.kotlin.backend.common.phaser.NamedCompilerPhase.invoke(CompilerPhase.kt:94)
at org.jetbrains.kotlin.backend.common.phaser.CompositePhase.invoke(PhaseBuilders.kt:30)
at org.jetbrains.kotlin.backend.common.phaser.NamedCompilerPhase.invoke(CompilerPhase.kt:94)
at org.jetbrains.kotlin.backend.common.phaser.CompilerPhaseKt.invokeToplevel(CompilerPhase.kt:41)
at org.jetbrains.kotlin.backend.jvm.JvmLower.lower(JvmLower.kt:407)
at org.jetbrains.kotlin.backend.jvm.JvmIrCodegenFactory.doGenerateFilesInternal$backend_jvm(JvmIrCodegenFactory.kt:147)
at org.jetbrains.kotlin.backend.jvm.JvmIrCodegenFactory.generateModule(JvmIrCodegenFactory.kt:120)
at org.jetbrains.kotlin.codegen.KotlinCodegenFacade.compileCorrectFiles(KotlinCodegenFacade.java:35)
at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.generate(KotlinToJVMBytecodeCompiler.kt:595)
at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules$cli(KotlinToJVMBytecodeCompiler.kt:211)
at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules$cli$default(KotlinToJVMBytecodeCompiler.kt:154)
at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:169)
at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:52)
at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:88)
at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:44)
at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:98)
at org.jetbrains.kotlin.maven.KotlinCompileMojoBase.execCompiler(KotlinCompileMojoBase.java:228)
at org.jetbrains.kotlin.maven.K2JVMCompileMojo.execCompiler(K2JVMCompileMojo.java:237)
at org.jetbrains.kotlin.maven.K2JVMCompileMojo.execCompiler(K2JVMCompileMojo.java:55)
at org.jetbrains.kotlin.maven.KotlinCompileMojoBase.execute(KotlinCompileMojoBase.java:209)
at org.jetbrains.kotlin.maven.K2JVMCompileMojo.execute(K2JVMCompileMojo.java:222)
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.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:81)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:56)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:305)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:192)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:105)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:956)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:192)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:282)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:225)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:406)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:347)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.apache.maven.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:39)
at org.apache.maven.wrapper.WrapperExecutor.execute(WrapperExecutor.java:122)
at org.apache.maven.wrapper.MavenWrapperMain.main(MavenWrapperMain.java:50)
Caused by: java.lang.IndexOutOfBoundsException: chars sequence.length:1831, start:1917, end:1922
at com.intellij.util.text.CharSequenceSubSequence.<init>(CharSequenceSubSequence.java:20)
at com.intellij.util.text.ImmutableText.subSequence(ImmutableText.java:194)
at org.jetbrains.kotlin.backend.jvm.lower.TypeOperatorLowering.visitTypeOperator(TypeOperatorLowering.kt:155)
at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitTypeOperator(IrElementTransformerVoid.kt:245)
at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitTypeOperator(IrElementTransformerVoid.kt:24)
at org.jetbrains.kotlin.ir.expressions.impl.IrTypeOperatorCallImpl.accept(IrTypeOperatorCallImpl.kt:40)
at org.jetbrains.kotlin.ir.expressions.IrExpression.transform(IrExpression.kt:33)
at org.jetbrains.kotlin.ir.expressions.IrExpressionBody.transformChildren(IrBody.kt:46)
at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitBody(IrElementTransformerVoid.kt:108)
at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitExpressionBody(IrElementTransformerVoid.kt:114)
at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitExpressionBody(IrElementTransformerVoid.kt:115)
at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitExpressionBody(IrElementTransformerVoid.kt:24)
at org.jetbrains.kotlin.ir.expressions.IrExpressionBody.accept(IrBody.kt:36)
at org.jetbrains.kotlin.ir.expressions.IrExpressionBody.transform(IrBody.kt:39)
at org.jetbrains.kotlin.ir.declarations.IrValueParameter.transformChildren(IrValueParameter.kt:55)
at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitDeclaration(IrElementTransformerVoid.kt:57)
at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitValueParameter(IrElementTransformerVoid.kt:98)
at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitValueParameter(IrElementTransformerVoid.kt:99)
at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitValueParameter(IrElementTransformerVoid.kt:24)
at org.jetbrains.kotlin.ir.declarations.IrValueParameter.transform(IrValueParameter.kt:48)
at org.jetbrains.kotlin.ir.declarations.IrValueParameter.transform(IrValueParameter.kt:27)
at org.jetbrains.kotlin.ir.util.TransformKt.transformIfNeeded(transform.kt:107)
at org.jetbrains.kotlin.ir.declarations.IrFunction.transformChildren(IrFunction.kt:69)
at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitDeclaration(IrElementTransformerVoid.kt:57)
at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitFunction(IrElementTransformerVoid.kt:69)
at org.jetbrains.kotlin.backend.common.lower.IrBuildingTransformer.visitFunction(LowerUtils.kt:143)
at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitSimpleFunction(IrElementTransformerVoid.kt:72)
at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitSimpleFunction(IrElementTransformerVoid.kt:73)
at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitSimpleFunction(IrElementTransformerVoid.kt:24)
at org.jetbrains.kotlin.ir.declarations.IrSimpleFunction.accept(IrSimpleFunction.kt:28)
at org.jetbrains.kotlin.ir.IrElement$DefaultImpls.transform(IrElement.kt:32)
at org.jetbrains.kotlin.ir.IrElementBase.transform(IrElementBase.kt:19)
at org.jetbrains.kotlin.ir.util.TransformKt.transformInPlace(transform.kt:35)
at org.jetbrains.kotlin.ir.declarations.IrClass.transformChildren(IrClass.kt:66)
at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitDeclaration(IrElementTransformerVoid.kt:57)
at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitClass(IrElementTransformerVoid.kt:66)
at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitClass(IrElementTransformerVoid.kt:67)
at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitClass(IrElementTransformerVoid.kt:24)
at org.jetbrains.kotlin.ir.declarations.IrClass.accept(IrClass.kt:55)
at org.jetbrains.kotlin.ir.IrElement$DefaultImpls.transform(IrElement.kt:32)
at org.jetbrains.kotlin.ir.IrElementBase.transform(IrElementBase.kt:19)
at org.jetbrains.kotlin.ir.declarations.impl.IrFileImpl.transformChildren(IrFileImpl.kt:71)
at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoidKt.transformChildrenVoid(IrElementTransformerVoid.kt:330)
at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.transformChildrenVoid(IrElementTransformerVoid.kt:325)
at org.jetbrains.kotlin.backend.jvm.lower.TypeOperatorLowering.lower(TypeOperatorLowering.kt:52)
at org.jetbrains.kotlin.backend.common.phaser.FileLoweringPhaseAdapter.invoke(PhaseBuilders.kt:155)
at org.jetbrains.kotlin.backend.common.phaser.FileLoweringPhaseAdapter.invoke(PhaseBuilders.kt:151)
at org.jetbrains.kotlin.backend.common.phaser.NamedCompilerPhase.invoke(CompilerPhase.kt:94)
at org.jetbrains.kotlin.backend.common.phaser.PerformByIrFilePhase.invoke(PhaseBuilders.kt:121)
... 51 more
JpayUserRepo.kt
👀 1
Additional information: • no error when removing the -Xuse-ir flag • there was also a (probably unrelated) warning just before the error (but I also had it with previous versions), copied below 
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.intellij.util.ReflectionUtil (file:/Users/emmanuel/.m2/repository/org/jetbrains/kotlin/kotlin-compiler/1.4.31/kotlin-compiler-1.4.31.jar) to method java.util.ResourceBundle.setParent(java.util.ResourceBundle)
WARNING: Please consider reporting this to the maintainers of com.intellij.util.ReflectionUtil
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
c
you could try making a copy of JpayUserRepo and delete code until it no longer fails. then you know whats causing it
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