Frequently seeing the following build error on `AS...

# compose

[Tash]

Frequently seeing the following build error on AS 4.2 Canary 15 & 1.0.0-alpha04 :

e: java.lang.IllegalArgumentException: Unbound type parameters are forbidden: [Unbound private symbol org.jetbrains.kotlin.ir.symbols.impl.IrTypeParameterSymbolImpl@4decb5a, Unbound private symbol org.jetbrains.kotlin.ir.symbols.impl.IrTypeParameterSymbolImpl@45aa5e3d]

Haven't had success with isolating it to anything in particular. Anyone know what might be causing this?

[Leland Richardson [G]]

is there any more to the stack trace?

[Leland Richardson [G]]

i’d be very interested in a minimal repro for this

[Leland Richardson [G]]

i think the easiest way to repro would be to bisect / binary search the code by just commenting code out until it succeeds

[Tash]

compiler-error-stacktrace.txt

[Tash]

@Leland Richardson [G] Here's the rest of the trace ran with --stacktrace

[Tash]

i’d be very interested in a minimal repro for this

Let me try commenting stuff out

[Leland Richardson [G]]

i see that that stack trace is from the incremental compiler. it might also be worth seeing if the exception happens / doesn’t happen depending on whether or not you are doing an incremental compile or not

[Tash]

non-incr-comp-trace.txt

[Tash]

Tried turning off incremental comp, seeing a similar failure, albeit different trace ^^ @Leland Richardson [G]

[Leland Richardson [G]]

thanks, good to know. it would be great if you could figure out what code is causing this. it is either a bug in the compose compiler (most likely) or a bug in the kotlin compiler

[Tash]

Still trying to pin it down. Its seems intermittent, so haven't gotten a good series of green builds

[Tash]

Will update this thread if anything turns up

[Leland Richardson [G]]

thanks!

[Tash]

@Leland Richardson [G] Update: A potential candidate seems to be a custom ViewModelProvider.Factory that I had created for DI purposes.

It is accessed in a Composable via an Ambient like so:

@Composable
internal fun ImageScreen() -> Unit) {
    val viewModel = viewModel<ImageViewModel>(factory = ViewModelFactoryAmbient.current)
}

[Tash]

The custom factory itself looks something like this:

class ViewModelFactory(...) : ViewModelProvider.Factory {
    @Suppress("UNCHECKED_CAST")
    override fun <T : ViewModel> create(modelClass: Class<T>): T {
        return when {
            modelClass.isAssignableFrom(ImageViewModel::class.java) -> {
                ImageViewModel(...) as T
            }
            else -> throw IllegalArgumentException("...")
        }
    }
}

[Leland Richardson [G]]

if you can come up with a small example that reproduces this, that would be very helpful

[Tash]

Ah this looks to be the issue: https://youtrack.jetbrains.com/issue/KT-41006
reportedly fixed in the unreleased kotlin 1.4.20

[Leland Richardson [G]]

ah. nice find

[Tash]

Couple of other related links:
https://issuetracker.google.com/issues/166927559
https://github.com/JetBrains/kotlin/pull/3726

[Tash]

Tried with 1.4.20-RC, but then getting a different error 😅 . I am guessing Compose might need its own updates for 1.4.20

[Leland Richardson [G]]

yep. we are working on 1.4.20 support, but aren’t there yet

[Tash]

Thank you! For the time being, going to pass the `ViewModel`s around via arguments instead of using the Compose viewinterop viewModel method.