I'm seeing a compiler error `Class has no primary ...

# javascript

[Robert Jaros]

I'm seeing a compiler error Class has no primary constructor: kotlin.Char when running production build (with jsBrowserProductionWebpack task) in my project. More in thread.

[Robert Jaros]

Full stacktrace:

e: java.lang.IllegalStateException: Class has no primary constructor: kotlin.Char
        at org.jetbrains.kotlin.backend.common.InlineClassesUtils.getInlineClassUnderlyingType(CommonBackendContext.kt:110)
        at org.jetbrains.kotlin.ir.backend.js.utils.JsInlineClassesUtils.getInlinedClass(JsInlineClassesUtils.kt:27)
        at org.jetbrains.kotlin.ir.backend.js.JsCommonInlineClassesUtils.isTypeInlined(JsCommonBackendContext.kt:138)
        at org.jetbrains.kotlin.ir.backend.js.utils.NameTablesKt.calculateJsFunctionSignature(NameTables.kt:153)
        at org.jetbrains.kotlin.ir.backend.js.utils.NameTablesKt.jsFunctionSignature(NameTables.kt:179)
        at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.JsNameLinkingNamer.fieldData(JsNameLinkingNamer.kt:207)
        at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.JsNameLinkingNamer.getNameForMemberFunction(JsNameLinkingNamer.kt:63)
        at org.jetbrains.kotlin.ir.backend.js.utils.JsStaticContext.getNameForMemberFunction(JsStaticContext.kt)
        at org.jetbrains.kotlin.ir.backend.js.utils.JsGenerationContext.getNameForMemberFunction(JsGenerationContext.kt)
        at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.JsAstUtilsKt.translateCall(jsAstUtils.kt:225)
        at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrElementToJsStatementTransformer.visitCall(IrElementToJsStatementTransformer.kt:200)
        at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrElementToJsStatementTransformer.visitCall(IrElementToJsStatementTransformer.kt:32)
        at org.jetbrains.kotlin.ir.expressions.IrCall.accept(IrCall.kt:26)
        at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrElementToJsStatementTransformer.visitBlockBody(IrElementToJsStatementTransformer.kt:40)
        at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrElementToJsStatementTransformer.visitBlockBody(IrElementToJsStatementTransformer.kt:32)
        at org.jetbrains.kotlin.ir.expressions.IrBlockBody.accept(IrBlockBody.kt:25)
        at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.JsAstUtilsKt.translateFunction(jsAstUtils.kt:118)
        at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrFunctionToJsTransformer.visitConstructor(IrFunctionToJsTransformer.kt:36)
        at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrFunctionToJsTransformer.visitConstructor(IrFunctionToJsTransformer.kt:16)
        at org.jetbrains.kotlin.ir.declarations.IrConstructor.accept(IrConstructor.kt:30)
        at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.JsClassGenerator.generateClassBlock(JsClassGenerator.kt:113)
        at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.JsClassGenerator.generate(JsClassGenerator.kt:64)
        at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrDeclarationToJsTransformer.visitClass(IrDeclarationToJsTransformer.kt:30)
        at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrDeclarationToJsTransformer.visitClass(IrDeclarationToJsTransformer.kt:13)
        at org.jetbrains.kotlin.ir.declarations.IrClass.accept(IrClass.kt:73)
        at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrFileToJsTransformer.visitFile(IrFileToJsTransformer.kt:25)
        at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrFileToJsTransformer.visitFile(IrFileToJsTransformer.kt:14)
        at org.jetbrains.kotlin.ir.declarations.IrFile.accept(IrFile.kt:31)
        at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrModuleToJsTransformer.generateProgramFragment(IrModuleToJsTransformer.kt:355)
        at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrModuleToJsTransformer.generateJsIrProgramPerModule(IrModuleToJsTransformer.kt:259)
        at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrModuleToJsTransformer.makeJsCodeGeneratorFromIr(IrModuleToJsTransformer.kt:244)
        at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrModuleToJsTransformer.makeJsCodeGenerator(IrModuleToJsTransformer.kt:204)
        at org.jetbrains.kotlin.cli.js.K2JsIrCompiler$Ir2JsTransformer.makeJsCodeGenerator(K2JsIrCompiler.kt:129)
        at org.jetbrains.kotlin.cli.js.K2JsIrCompiler$Ir2JsTransformer.compileAndTransformIrNew(K2JsIrCompiler.kt:133)
        at org.jetbrains.kotlin.cli.js.K2JsIrCompiler.doExecute(K2JsIrCompiler.kt:391)
        at org.jetbrains.kotlin.cli.js.K2JSCompiler.doExecute(K2JSCompiler.java:181)
        at org.jetbrains.kotlin.cli.js.K2JSCompiler.doExecute(K2JSCompiler.java:72)
        at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:104)
        at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:48)
        at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
        at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1523)
        at jdk.internal.reflect.GeneratedMethodAccessor42.invoke(Unknown Source)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:568)
        at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:360)
        at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)
        at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:712)
        at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)
        at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:587)
        at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828)
        at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:705)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
        at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:704)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
        at java.base/java.lang.Thread.run(Thread.java:840)

[Robert Jaros]

The problem doesn't occur with development build.

[Robert Jaros]

I'm on Kotlin 1.9.22.

[Robert Jaros]

Is it a know issue?

[Robert Jaros]

It's hard for me to pinpoint the exact code which triggers the error.

[Robert Jaros]

And that's because the error can be fixed by adding some code and not by removing it (!!)

[turansky]

Char usage in exported method/property?

[Robert Jaros]

no, I'm not using any exports

[Robert Jaros]

That's really weird. When my application code is empty like this:

class App : Application() {
    override fun start() {
        root("root") {
        }
    }
}

I see the above compiler error.

[Robert Jaros]

When I add a single line:

class App : Application() {
    override fun start() {

        root("root") {
            DefaultLocale()
        }
    }
}

it works.

[Robert Jaros]

It's definitely something about the DefaultLocale class, because it uses Char class, but how it's possible that adding some code fixes a compiler error?