Why does this not work? ```fun CoroutineScope.launchIO(block: suspend CoroutineScope.() -> Unit)...

# coroutines

[cah]

Why does this not work?

fun CoroutineScope.launchIO(block: suspend CoroutineScope.() -> Unit): Job {
    return launch(
        context = IO,
        start = CoroutineStart.DEFAULT,
        block = block
    )
}

If I try to use this in place of the regular launch I get the following error:

java.lang.NoSuchMethodError: 'kotlinx.coroutines.Job com.some.misc.ExtensionsKt.launchIO(kotlinx.coroutines.CoroutineScope, kotlin.jvm.functions.Function2)'

I am more curious as to what I'm missing here rather than this being a serious use case

[Joffrey]

NoSuchMethodError usually sounds like the runtime classpath is missing something that was there at compile time. How are you compiling and running this code and the code that calls it?

[cah]

This is part of a ktor project which I'm running using the gradle run task

[Joffrey]

Is this a multi-module project? Maybe the module containing launchIO is declared as compileOnly dependency of the module using it?

[julian]

@cah I'm able to compile and run your code without errors.