What am I missing here This should compile right ``` GlobalS kotlinlang #coroutines

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Title

u

uhe

06/20/2019, 11:34 AM

What am I missing here? This should compile, right?

GlobalScope.launch {
            flowOf(1,2,3,4,5)
                .delayEach(500)
                .map { it * it }
                .collect { println(it) } // Type mismatch: inferred type is () -> ??? but FlowCollector<Int> was expected
        }

t

thana

06/20/2019, 11:51 AM

for me it does compile...

s

streetsofboston

06/20/2019, 12:08 PM

This may have improved with the new type inference of Kotlin v1.3.40. Malte may have that newest version, while you may have 1.3.31 or older...

t

thana

06/20/2019, 12:18 PM

even with 1.3.31 is seems to work well: https://pl.kotl.in/RYtHet74G

v

Vlad

06/20/2019, 12:36 PM

Check your imports for kotlinx.coroutines.flow.collect

u

uhe

06/20/2019, 1:08 PM

I tested this with both 1.3.40 and 1.3.31

I'll try the good ol' invalidate caches & restart, I guess

Well I'll be damned, I actually had to manually import the

collect

extension, because apparently without the import it references

Flow::collect

, resulting in the compile error. That's... unfortunate. Thanks @Vlad

e

elizarov

06/20/2019, 1:32 PM

Does it reproduce?

u

uhe

06/20/2019, 1:38 PM

In my project it does. I'll try to reproduce it in a fresh one.

It does actually. I mean, it can be easily remedied by pressing CTRL+Space on the

collect

method and selecting the extension function instead. It's just that the error was a bit misleading in the beginning, because a different

collect

method is being referenced by default (the one with

@InternalCoroutinesApi

in

Flow

).

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