Scala 2.12 and Java 8 SAM interop doesn't compile -


i'm trying test java 8 class using rx.observable scala test. per scala 2.12.0-m3 release notes:

lambda syntax sam types (experimental) of m3, feature not yet on default. can enable -xexperimental compiler option.

when option enabled, similar java 8, scala 2.12 allows instantiating type 1 single abstract method passing lambda.

however, using gradle , intellij, can't following compile:

val o: rx.observable[util.map.entry[string, _ <: util.collection[string]]] = ??? val scheduler = new testscheduler() scheduler.createworker().schedule(_ => o.foreach { }) // argument action0, has sam void call()

build.gradle:

apply plugin: 'scala'  group = 'name.abhijitsarkar.scala' version = '1.0-snapshot'  tasks.withtype(scalacompile) {     scalacompileoptions.useant = false     scalacompileoptions.additionalparameters = ["-feature", "-xexperimental"]     targetcompatibility = "1.8" }  dependencies {     compile 'org.scala-lang:scala-library:2.12.0-m3'     compile 'com.typesafe.akka:akka-stream-experimental_2.11:2.0.3'     compile 'io.reactivex:rxjava:1.1.0'     testcompile 'org.scalatest:scalatest_2.12.0-m3:3.0.0-m12' } 

scheduler.createworker().schedule(_ => o.foreach { }) // argument action0, has sam void call()

that try pass "function" 1 argument (rather anonymous instance of interface/trait 1-argument sam). _ indicates don't use argument in body. action0's call() takes 0 arguments, try () => o.foreach { } instead.


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