How best to call suspend functions from

Sequence.map

and

flatMap

? These operations on

Sequence

are not inlined, unlike

List

, so you get the error

Suspension functions can only be called within coroutine body

. I don't want to use

runBlocking

inside the lambda.

Use channel instead of sequence.

Thanks @Jonathan!

Maybe contracts can be used to capture the continuation from within lambdas.

@Dico. No lambda is not executed in place. The problem is that we don't know on which context the lambda of

Sequence.map

will be executed (or if it will be executed at all). This is inherent to sequences since everything will be evaluated lazily on the context of iterator's usage.

Right, the static extension functions of

Sequence

can't make any guarantees about where/when the programmer invokes a terminal operation.