To execute: child/run

Following configuration fails with java.lang.NoSuchMethodError: cats.effect.ContextShift.$init$(Lcats/effect/ContextShift;)V:

lazy val core = project
  .settings(libraryDependencies += "org.typelevel" %% "cats-effect" % "2.0.0")

lazy val child = project
  .settings(dependencyOverrides += "org.typelevel" %% "cats-effect" % "1.4.0")
  .dependsOn(core)

Different combinations work:

lazy val core = project
  .settings(libraryDependencies += "org.typelevel" %% "cats-effect" % "1.4.0")

lazy val child = project
  .settings(dependencyOverrides += "org.typelevel" %% "cats-effect" % "2.0.0")
  .dependsOn(core)

lazy val core = project
  .settings(libraryDependencies += "org.typelevel" %% "cats-effect" % "1.4.0")

lazy val child = project
  .settings(libraryDependencies += "org.typelevel" %% "cats-effect" % "2.0.0")
  .dependsOn(core)

lazy val core = project
  .settings(libraryDependencies += "org.typelevel" %% "cats-effect" % "2.0.0")

lazy val child = project
  .settings(libraryDependencies += "org.typelevel" %% "cats-effect" % "1.4.0")
  .dependsOn(core)