This gives me JS/IR compiler `ClassCastException` error on 1.5.21: ```console.log(delay(5))``` (it c...

# javascript

[Robert Jaros]

This gives me JS/IR compiler ClassCastException error on 1.5.21:

console.log(delay(5))

(it can be any suspending function inside console.log(...))

[Robert Jaros]

Works on legacy.
Also works on 1.5.10/IR with coroutines 1.5.0.

[Robert Jaros]

It's probably this stacktrace, but it's hard to get from logs:

e: java.lang.ClassCastException: class org.jetbrains.kotlin.ir.expressions.impl.IrGetValueImpl cannot be cast to class org.jetbrains.kotlin.ir.expressions.IrVararg (org.jetbrains.kotlin.ir.expressions.impl.IrGetValueImpl and org.jetbrains.kotlin.ir.expressions.IrVararg are in unnamed module of loader 'app')
        at org.jetbrains.kotlin.ir.backend.js.lower.VarargTransformer.transformFunctionAccessExpression(VarargLowering.kt:228)
        at org.jetbrains.kotlin.ir.backend.js.lower.VarargTransformer.visitFunctionAccess(VarargLowering.kt:255)
        at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitCall(IrElementTransformerVoid.kt:198)
        at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitCall(IrElementTransformerVoid.kt:199)
        at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitCall(IrElementTransformerVoid.kt:24)

[Robert Jaros]

Can someone confirm?

[Big Chungus]

Write an inline wrapper that takes a suspend lambda and returns a promise? Looks like it working on legacy was just a bug.

[Big Chungus]

Or are you logging in suspend scope already?

[Robert Jaros]

yes

[Big Chungus]

Ah, ignore the above then 😀

[Robert Jaros]

I want to report the issue but would like someone to confirm.

[Big Chungus]

I'll check it on my project in an hour and report back

[Big Chungus]

Just checked and can confirm that I'm getting the same error with 1.5.21

java.lang.ClassCastException: org.jetbrains.kotlin.ir.expressions.impl.IrGetValueImpl incompatible with org.jetbrains.kotlin.ir.expressions.IrVararg

[Ilya Kalibrov [JB]]

@Robert Jaros Thank you for letting us know! Will you create a ticket or should I do it?

[Ilya Kalibrov [JB]]

https://youtrack.jetbrains.com/issue/KT-47811

[Robert Jaros]

I've already started to fill an issue but had to do something else 😉

[andylamax]

Stumped into this again today, argh.