"java.lang.IllegalStateException: Couldn't find implementation for..." when app tries to use lib composables (plus generics?)

[bitspittle]

Please see the associated repository which includes a minimal sample that you can clone and then compile to reproduce:

https://github.com/bitspittle/bugreports/tree/jb-compose-compiler-app-lib

Note the weird branch. You might clone it using the following command:

 $ git clone --branch jb-compose-compiler-app-lib https://github.com/bitspittle/bugreports.git bug-1333

This may be a web only issue, I'm not sure. But I ran into it using Web Compose, so my repro sample is web code. But I wouldn't be surprised if this happens more generally than just web.

When you compile (./gradlew compileKotlinJs), you should get an exception stack like:

e: java.lang.IllegalStateException: Couldn't find implementation for toModifier                                                                               
        at androidx.compose.compiler.plugins.kotlin.lower.decoys.DecoyTransformBase$DefaultImpls.getComposableForDecoy(DecoyTransformBase.kt:134)             
        at androidx.compose.compiler.plugins.kotlin.lower.decoys.SubstituteDecoyCallsTransformer.getComposableForDecoy(SubstituteDecoyCallsTransformer.kt:49) 
        at androidx.compose.compiler.plugins.kotlin.lower.decoys.SubstituteDecoyCallsTransformer.visitSimpleFunction(SubstituteDecoyCallsTransformer.kt:113)  
        at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitSimpleFunction(IrElementTransformerVoid.kt:73)                                      
        at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitSimpleFunction(IrElementTransformerVoid.kt:24)                                      
        at org.jetbrains.kotlin.ir.declarations.IrSimpleFunction.accept(IrSimpleFunction.kt:28)                                                               
        at org.jetbrains.kotlin.ir.IrElement$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$DefaultImpls.transform(IrElement.kt:32)                                                                          
        at org.jetbrains.kotlin.ir.IrElementBase.transform(IrElementBase.kt:19)                                                                               
        at org.jetbrains.kotlin.ir.declarations.impl.IrFileImpl.transformChildren(IrFileImpl.kt:89)                                                           
        at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitPackageFragment(IrElementTransformerVoid.kt:41)                                     
        at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitFile(IrElementTransformerVoid.kt:47)                                                
        at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitFile(IrElementTransformerVoid.kt:48)                                                
        at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitFile(IrElementTransformerVoid.kt:24)
        at org.jetbrains.kotlin.ir.declarations.impl.IrFileImpl.accept(IrFileImpl.kt:81)
        at org.jetbrains.kotlin.ir.declarations.IrFile.transform(IrFile.kt:52)
        at org.jetbrains.kotlin.ir.declarations.impl.IrModuleFragmentImpl.transformChildren(IrModuleFragmentImpl.kt:45)
        at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoidKt.transformChildrenVoid(IrElementTransformerVoid.kt:330)
        at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.transformChildrenVoid(IrElementTransformerVoid.kt:325)
        at androidx.compose.compiler.plugins.kotlin.lower.decoys.SubstituteDecoyCallsTransformer.lower(SubstituteDecoyCallsTransformer.kt:64)
        at androidx.compose.compiler.plugins.kotlin.ComposeIrGenerationExtension.generate(ComposeIrGenerationExtension.kt:139)
        at org.jetbrains.kotlin.ir.backend.js.KlibKt.generateModuleFragmentWithPlugins$lambda-20(klib.kt:402)
        at org.jetbrains.kotlin.psi2ir.Psi2IrTranslator.generateModuleFragment(Psi2IrTranslator.kt:89)
        at org.jetbrains.kotlin.ir.backend.js.KlibKt.generateModuleFragmentWithPlugins(klib.kt:407)
        at org.jetbrains.kotlin.ir.backend.js.KlibKt.generateKLib(klib.kt:172)
        at org.jetbrains.kotlin.cli.js.K2JsIrCompiler.doExecute(K2JsIrCompiler.kt:243)
        at org.jetbrains.kotlin.cli.js.K2JSCompiler.doExecute(K2JSCompiler.java:182)
        at org.jetbrains.kotlin.cli.js.K2JSCompiler.doExecute(K2JSCompiler.java:75)
        at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:92)
        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.incremental.IncrementalJsCompilerRunner.runCompiler(IncrementalJsCompilerRunner.kt:191)
        at org.jetbrains.kotlin.incremental.IncrementalJsCompilerRunner.runCompiler(IncrementalJsCompilerRunner.kt:77)
        at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileIncrementally(IncrementalCompilerRunner.kt:358)
        at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileIncrementally$default(IncrementalCompilerRunner.kt:300)
        at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl$rebuild(IncrementalCompilerRunner.kt:119)
        at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:170)
        at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:81)
        at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile$default(IncrementalCompilerRunner.kt:72)
        at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execJsIncrementalCompiler(CompileServiceImpl.kt:550)
        at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execJsIncrementalCompiler(CompileServiceImpl.kt:96)
        at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1745)
        at jdk.internal.reflect.GeneratedMethodAccessor85.invoke(Unknown Source)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
        at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)
        at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:691)
        at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196) 
        at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:587)
        at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828)
        at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:705)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
        at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:704)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base/java.lang.Thread.run(Thread.java:831)