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Structural typing, exception #192

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scabug opened this issue Oct 18, 2007 · 4 comments
Closed

Structural typing, exception #192

scabug opened this issue Oct 18, 2007 · 4 comments
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scabug commented Oct 18, 2007

The following does yield an exception:

object Bug extends Application{
  def x(y: Any{def +(z: Int): Int}) = y + 5
  x(2)
}
Bug
java.lang.NoSuchMethodException: java.lang.Integer.$$plus(int)
        at java.lang.Class.getMethod(Unknown Source)
        at Bug$$.x(<console>:5)
        at Bug$$.<init>(<console>:6)
        at Bug$$.<clinit>(<console>)
        at .<init>(<console>:6)
        at .<clinit>(<console>)
        at RequestResult$$.<init>(<console>:3)
        at RequestResult$$.<clinit>(<console>)
        at RequestResult$$result(<console>)
        at sun.reflect.NativeM...
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scabug commented Oct 18, 2007

Imported From: https://issues.scala-lang.org/browse/SI-192?orig=1
Reporter: Henrik Huttunen (hvkhut)

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scabug commented Jan 1, 2008

Coda Hale (codahale) said:
This is still a problem (I think) with Array.

This script:

def printSize[T <% {def size: Int}](in: T) = println(in.size)

printSize(List(1, 2, 3))
printSize("caw")
printSize(Map(1 -> 2))
printSize(Array(1, 2, 3))

Produces this result:

3
3
1
java.lang.NoSuchMethodException: [I.size()
	at java.lang.Class.getMethod(Class.java:1581)
	at Main$$.reflMethod$$Method1((virtual file):4)
	at Main$$.printSize$$1((virtual file):4)
	at Main$$.main((virtual file):9)
	at Main.main((virtual file))
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at scala.tools.nsc.ObjectRunner$$$$anonfun$$run$$1.apply(ObjectRunner.scala:75)
	at scala.tools.nsc.ObjectRunner$$.withContextClassLoader(ObjectRunner.scala:49)
	at scala.tools.nsc.ObjectRunner$$.run(ObjectRunner.scala:74)
	at scala.tools.nsc.ScriptRunner$$.scala$$tools$$nsc$$ScriptRunner$$$$runCompiled(ScriptRunner.scala:363)
	at scala.tools.nsc.ScriptRunner$$$$anonfun$$runScript$$1.apply(ScriptRunner.scala:389)
	at scala.tools.nsc.ScriptRunner$$$$anonfun$$runScript$$1.apply(ScriptRunner.scala:388)
	at scala.tools.nsc.ScriptRunner$$.withCompiledScript(ScriptRunner.scala:325)
	at scala.tools.nsc.ScriptRunner$$.runScript(ScriptRunner.scala:388)
	at scala.tools.nsc.MainGenericRunner$$.main(MainGenericRunner.scala:172)
	at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

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scabug commented Jan 21, 2008

@dubochet said:
Problem with arrays is a separate issue (fix is completely different). I created ticket #397 for it.

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scabug commented Jan 14, 2009

@odersky said:
Milestone 2.6.1 deleted

@scabug scabug closed this as completed May 18, 2011
@scabug scabug added the critical label Apr 6, 2017
This was referenced Apr 6, 2017
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