I can't unimport names under scala package object

[eed3si9n]

steps

I want to mask scala.Seq.

scala> :paste
// Entering paste mode (ctrl-D to finish)

object Foo {
  import scala.{ Seq => _, _ }
  val xs = Seq(1, 2, 3)
}

// Exiting paste mode, now interpreting.

defined object Foo

scala> Foo.xs
res1: Seq[Int] = List(1, 2, 3)

problem

The name Seq is still available within object Foo { ... }.

expectation

The code does not compile.

[Jasper-M]

It's generally not possible to unimport something after it has already been imported:

scala> def foo = {
     |   import scala.util._
     |   import scala.util.{Try => _, _}
     |   Try(1/0)
     | }
foo: scala.util.Try[Int]

Also see:

-Yimports:<import>                       Custom root imports, default is `java.lang,scala,scala.Predef`.
-Yno-imports                             Compile without importing scala.*, java.lang.*, or Predef.
-Yno-predef                              Compile without importing Predef.

[eed3si9n]

It's generally not possible to unimport something after it has already been imported

Trying to tie this back to the spec.

2 says:

A binding in some inner scope shadows bindings of lower precedence in the same scope as well as bindings of the same or lower precedence in outer scopes.

I guess in my example, the unqualified Seq would not be bound in object Foo scope, so it would try the outer scope of that and finds import scala._ in there.