Scala compiler oddity #1

RiddleMeThis.scala

// So, given this declaration:

import java.io.File
val scalaDirs = new File("target").listFiles.filter(_.getName.startsWith("scala"))

// Why does this work:

scalaDirs.take(1).map(new File(_, "classes")).toList(0)

// but this fails to compile?

scalaDirs.take(1).map(new File(_, "classes")).toArray(0)

// <console>:15: error: type mismatch;
//  found   : Int(0)
//  required: scala.reflect.ClassManifest[?]
//               res8.take(1).map(new File(_, "classes")).toArray(0)

// This also fails to compile, though the error is slightly different:

scalaDirs.take(1).map(new File(_, "classes"))(0)

// <console>:15: error: type mismatch;
//  found   : Int(0)
//  required: scala.collection.generic.CanBuildFrom[Array[java.io.File],java.io.File,?]
//              res8.take(1).map(new File(_, "classes"))(0)

// ... even though

scalaDirs.take(1).map(new File(_, "classes"))

// is of type Array[File]

I think you'll find that Josh and I agree with you.