Failure in sbt/sbt, using sbt 1.3.0-RC2

[dwijnand]

Compiling and running some code in a branch based on current sbt/sbt I'm getting:

[error] java.lang.IllegalAccessError: tried to access method lmcoursier.definitions.Dependency.copy$default$1()Llmcoursier/definitions/Module; from class coursier.sbtcoursiershared.InputsTasks$
[error] 	at coursier.sbtcoursiershared.InputsTasks$.$anonfun$coursierProject0$1(InputsTasks.scala:53)
[error] 	at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:237)
[error] 	at scala.collection.immutable.List.foreach(List.scala:392)
[error] 	at scala.collection.TraversableLike.map(TraversableLike.scala:237)
[error] 	at scala.collection.TraversableLike.map$(TraversableLike.scala:230)
[error] 	at scala.collection.immutable.List.map(List.scala:298)
[error] 	at coursier.sbtcoursiershared.InputsTasks$.coursierProject0(InputsTasks.scala:51)
[error] 	at coursier.sbtcoursiershared.InputsTasks$.$anonfun$coursierProjectTask$2(InputsTasks.scala:75)
[error] 	at scala.Function1.$anonfun$compose$1(Function1.scala:49)
[error] 	at sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:62)
[error] 	at sbt.std.Transform$$anon$4.work(Transform.scala:67)
[error] 	at sbt.Execute.$anonfun$submit$2(Execute.scala:280)
[error] 	at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:19)
[error] 	at sbt.Execute.work(Execute.scala:289)
[error] 	at sbt.Execute.$anonfun$submit$1(Execute.scala:280)
[error] 	at sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:178)
[error] 	at sbt.CompletionService$$anon$2.call(CompletionService.scala:37)
[error] 	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[error] 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[error] 	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[error] 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[error] 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[error] 	at java.lang.Thread.run(Thread.java:748)

(about 10-20 times)