managedClasspath(Runtime) contains scala-library from sbt boot path

[felixmulder]

Discovered when publishing JARs using custom build code. We're deprecating this in favor of sbt-assembly - but felt we should at least open an issue.

steps

// build.sbt
managedClasspath.in(Runtime)
  .value.files.find(_.getName.contains("scala-library")).foreach(println)

problem

This will print: /home/<user>/.sbt/boot/scala-2.12.4/lib/scala-library.jar. This will be the scala-library even if the scalaVersion is set to something like 2.12.3.

expectation

The ivy or coursier cached JAR should be on the classpath - and that it correctly reflects scalaVersion

notes

sbt version: 1.0.4

Our temporary hack around this was to upgrade the scalaVersion to the one sbt is using.