Where can I report a bug? there's nothing about compose in here https://source.android.com/setup/contribute/report-bugs

interface Foo {
    fun foo() =
        Stream.of(null) // null or any object
            .map { it }
}

e: java.lang.IllegalStateException: Backend Internal error: Exception during code generation

also throws that error when using

Flowable.fromIterable

from rxJava

There’s Jetpack compose component on google’s issue tracker: https://issuetracker.google.com/issues?q=componentid:612128

This is likely related to the ir compiler. Please report a big and I will forward it to the right people

I also hit this IR exception very quickly on my project. I tried removing code for a while but couldn't track down why it was happening.

What's IR ?

Intermediate representation. Jetbrains is rewriting their backend and I'm referring to that as "ir compiler". Compose relies on it so you might see bugs relating to it when using compose.

Well in a new project I didn't get this error so in the end I haven't reported it

I had the same problem, you can check thsi thread https://kotlinlang.slack.com/archives/CJLTWPH7S/p1572008095406200

@Jakub Valigura yeah but the nested ex was different

Yea I know but was also related to IR backend so maybe it will help 🙂