We're considering to introduce something like comb...

# stdlib

[ilya.gorbunov]

We're considering to introduce something like combination of flatMap { buildSequence { }}, say flatBuild, so that one could yield several values from lambda:

listOf(2, 3, 4).flatBuild { 
    yield(it)
    if (it % 2 == 0) yield(-it)
}