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Subject: weirdness in typechecking call on overloaded java method - msg#00099

List: lang.scala

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Hi,

I've stumbled upon a typing issue I'm at a loss to explain. Following is a minimal test case:

---------------------------------------------
// ScalaMenuTest.scala
object ScalaMenuTest {
  def main(args: Array[String]): Unit = {
    val v = new javax.swing.JMenu()
    v.add(new javax.swing.JMenuItem())
    //v.add(new java.awt.PopupMenu());
  }
}

//==> compiling with scalac2 results in
//
// found   : javax.swing.JMenuItem
// required: java.awt.PopupMenu
//    v.add(new javax.swing.JMenuItem())
//          ^
//one error found
---------------------------------------------

As a sanity check, here is the equivalent Java code:

---------------------------------------------
// JavaMenuTest.java

class JavaMenuTest {
  public static void main(String[] args) {
    javax.swing.JMenu v = new javax.swing.JMenu();
    v.add(new javax.swing.JMenuItem());
   //v.add(new java.awt.PopupMenu());
  }
}
---------------------------------------------

I'd greatly appreciate if someone could verify; perhaps it's a environment-related issue on my end?? If not, is it perhaps a compiler bug?
What I find truly bizarre is that if the call adding a PopupMenu is uncommented, it then typechecks just fine.

Many thanks,
Jason
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Thread at a glance:

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Re: gadt

Niels Hoogeveen wrote: I'm trying to toy around with Scala2 within Eclipse, but I can's seem to find a proper way to set the -Xgadt flag, any suggestions? If you want to play with GADT's there is acturaly no need to change the flag. Gadts are already enabled for function paramters in Scala 2. The - Xgadt flag enables them also for class constructor parameters, but this is not working completely right now. Cheers -- Martin

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Re: weirdness in typechecking call on overloaded java method

"Jason Kinzer" <jmkinzer@xxxxxxxxx> writes: > I've stumbled upon a typing issue I'm at a loss to explain. Following is a > minimal test case: > > --------------------------------------------- > // ScalaMenuTest.scala > object ScalaMenuTest { > def main(args: Array[String]): Unit = { > val v = new javax.swing.JMenu() > v.add(new javax.swing.JMenuItem()) > //v.add(new java.awt.PopupMenu()); > } > } > > //==> compiling with scalac2 results in > // > // found : javax.swing.JMenuItem > // required: java.awt.PopupMenu > // v.add(new javax.swing.JMenuItem()) > // ^ > //one error found > --------------------------------------------- There have been problems like this, but your example compiles for me using version 2.0.5843 and 2.0.5774 . Can you check your version (scalac -version), and upgrade if it is older than these? Otherwise, maybe it is environmental. I am using a 1.5 Sun SDK. -Lex

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gadt

I'm trying to toy around with Scala2 within Eclipse, but I can's seem to find a proper way to set the -Xgadt flag, any suggestions? k.r. Niels

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Re: weirdness in typechecking call on overloaded java method

"Jason Kinzer" <jmkinzer@xxxxxxxxx> writes: > I've stumbled upon a typing issue I'm at a loss to explain. Following is a > minimal test case: > > --------------------------------------------- > // ScalaMenuTest.scala > object ScalaMenuTest { > def main(args: Array[String]): Unit = { > val v = new javax.swing.JMenu() > v.add(new javax.swing.JMenuItem()) > //v.add(new java.awt.PopupMenu()); > } > } > > //==> compiling with scalac2 results in > // > // found : javax.swing.JMenuItem > // required: java.awt.PopupMenu > // v.add(new javax.swing.JMenuItem()) > // ^ > //one error found > --------------------------------------------- There have been problems like this, but your example compiles for me using version 2.0.5843 and 2.0.5774 . Can you check your version (scalac -version), and upgrade if it is older than these? Otherwise, maybe it is environmental. I am using a 1.5 Sun SDK. -Lex
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