After deleting a package via the context menu in the package explorer containing a single file with a single object, the Problems view now reports the following error:

Error in Scala compiler: Resource '/FileEncodingErrorTesting/src/test/DeleteMe.scala' does not exist.

The error disappears when cleaning the project, it seems.

I'm using Eclipse 3.5.2 Classic 32-bit on Windows 7 x64, with the Scala Plugin wip_exp_backport, nightly 1.0.0.201101060121.

The stack trace from the error log:

org.eclipse.core.internal.resources.ResourceException: Resource '/FileEncodingErrorTesting/src/test/DeleteMe.scala' does not exist.
at org.eclipse.core.internal.resources.Resource.checkExists(Resource.java:319)
at org.eclipse.core.internal.resources.Resource.checkAccessible(Resource.java:196)
at org.eclipse.core.internal.resources.File.getContents(File.java:286)
at scala.tools.eclipse.util.EclipseFile.input(EclipseFile.scala:139)
at scala.tools.nsc.io.AbstractFile.toByteArray(AbstractFile.scala:153)
at scala.tools.nsc.io.SourceReader.read(SourceReader.scala:70)
at scala.tools.nsc.Global.getSourceFile(Global.scala:232)
at scala.tools.nsc.Global$Run$$anonfun$compileFiles$1.apply(Global.scala:811)
at scala.tools.nsc.Global$Run$$anonfun$compileFiles$1.apply(Global.scala:811)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:206)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:206)
at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:61)
at scala.collection.immutable.List.foreach(List.scala:45)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:206)
at scala.collection.immutable.List.map(List.scala:45)
at scala.tools.nsc.Global$Run.compileFiles(Global.scala:811)
at scala.tools.nsc.interactive.RefinedBuildManager.update0$1(RefinedBuildManager.scala:127)
at scala.tools.nsc.interactive.RefinedBuildManager.update(RefinedBuildManager.scala:186)
at scala.tools.nsc.interactive.RefinedBuildManager.update(RefinedBuildManager.scala:93)
at scala.tools.eclipse.EclipseBuildManager.build(EclipseBuildManager.scala:133)
at scala.tools.eclipse.ScalaProject.build(ScalaProject.scala:403)
at scala.tools.eclipse.ScalaBuilder$$anonfun$build$1.apply(ScalaBuilder.scala:79)
at scala.tools.eclipse.ScalaBuilder$$anonfun$build$1.apply(ScalaBuilder.scala:38)
at scala.tools.eclipse.internal.logging.Tracer$.timeOf(Tracer.scala:28)
at scala.tools.eclipse.ScalaBuilder.build(ScalaBuilder.scala:38)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:627)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:170)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:201)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:253)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:256)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:309)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:341)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:140)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:238)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)