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kotlinlang

Has anyone tried to use Kotlin 1.6.20 with the corresponding Compose pre-release compiler (`1.2.0-dev-k1.6.20-61e81dadb1c`)?

Over here, building the IntelliJ wizard Compose Web demo fails in `compileProductionExecutableKotlinJs` with
&gt; Internal error in file lowering: java.util.NoSuchElementException: Collection contains no element matching the predicate.

`build.gradle.kts` modified as follows:
```repositories {
    google()
    mavenCentral()
    maven("<https://maven.pkg.jetbrains.space/public/p/compose/dev>")
    maven("<https://androidx.dev/storage/compose-compiler/repository/>")  // for Compose pre-release compiler
}

// Compose pre-release compiler from <https://androidx.dev/storage/compose-compiler/repository>.
configurations.all {
    resolutionStrategy.dependencySubstitution {
        substitute(module("org.jetbrains.compose.compiler:compiler"))
            .using(module("androidx.compose.compiler:compiler:1.2.0-dev-k1.6.20-61e81dadb1c"))
            .because("using the compose pre-release compiler")
    }
}```


The above occurs with `org.jetbrains.compose.web:web-core` and `org.jetbrains.compose.runtime:runtime` versions up to (including) `1.2.0-alpha01-dev609`. For `1.2.0-alpha01-dev617` and above, it changes to
&gt; IR lowering failed at: Main.kt [...]
&gt; Caused by: java.lang.IllegalStateException: Could not find the singleton lambda for CALL 'internal final fun &lt;get-lambda-1&gt; (): @[ExtensionFunctionType] kotlin.Function3&lt;org.jetbrains.compose.web.dom.ElementScope&lt;org.w3c.dom.HTMLButtonElement&gt;, androidx.compose.runtime.Composer, <http://kotlin.Int|kotlin.Int>, kotlin.Unit&gt; declared in .ComposableSingletons$MainKt' type=@[ExtensionFunctionType] kotlin.Function3&lt;org.jetbrains.compose.web.dom.ElementScope&lt;org.w3c.dom.HTMLButtonElement&gt;, androidx.compose.runtime.Composer, <http://kotlin.Int|kotlin.Int>, kotlin.Unit&gt; origin=null
Seems there are no compatible artifacts in the JB repository and there is no version check in Compose for this which could provide a more meaningful diagnosis.

I would just wait until <https://android-review.googlesource.com/c/platform/frameworks/support/+/2020776> is merged in upstream and compose-jb is rebased on this commit.

Isn't 1.2.0-alpha01-dev609 the version published by Google? Google does not support compose-web, does it?
<https://maven.pkg.jetbrains.space/public/p/compose/dev/org/jetbrains/compose/web/web-core/> there is no 1.6.20 compatible version by JetBrains yet.

`web-core/1.2.0-alpha01-dev609`  metadata mentions `"buildPluginVersion": "1.6.10"`. Don't know if that's indicative of Compose compiler compatibility, as the Compose Gradle plugin is still at 1.6.10 when using the 1.6.20 pre-release compiler. Sure, I can always wait. Nevertheless, to encourage pre-release testing, an early warning about possible artifact incompatibility would be useful, like the one when trying to use Compose with an incompatible Kotlin version.

You could try to use `1.2.0-alpha01-dev667` :smile: But I still get some errors.