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Typer error when instantiating value class from value in array #5608

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scabug opened this issue Mar 26, 2012 · 4 comments

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@scabug
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commented Mar 26, 2012

Here's a simple test program:

object Main {
  def main(args:Array[String]) {
    val ns = Array(3L, 3L, 3L)
    val a:A = new A(ns(0))
  }
}

class A(val u:Long) extends AnyVal

It currently crashes with an error in typer:

exception when typing new <error>(ns.apply(0).$asInstanceOf[<notype>]())
class type required but <notype> found in file test.scala
scala.reflect.internal.Types$TypeError: class type required but <notype> found
        at scala.tools.nsc.typechecker.Contexts$Context.issue(Contexts.scala:317)

If you save the dereference Long in a val and then instantiate A, things are fine.

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commented Mar 26, 2012

Imported From: https://issues.scala-lang.org/browse/SI-5608?orig=1
Reporter: @non
Other Milestones: 2.10.0
Attachments:

  • error.txt (created on Mar 27, 2012 2:42:37 PM UTC, 17511 bytes)
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commented Mar 26, 2012

@non said:
I should add that if you cast to A (rather than construct A) things seem to work:

ns(0).asInstanceOf[A]
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commented Mar 27, 2012

@cvogt said (edited on Mar 27, 2012 2:43:03 PM UTC):
confirmed in 8f42361d71d11e9522052dcb5d9be020df7e5cc5

I attached the complete error message as error.txt

@scabug scabug closed this May 3, 2012

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commented May 3, 2012

@paulp said:
453d615fb3

@scabug scabug added the valueclass label Apr 7, 2017

@scabug scabug added this to the 2.10.0-M3 milestone Apr 7, 2017

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