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IllegalArgumentException creating Array[Array[Unit]] #5680

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scabug opened this issue Apr 18, 2012 · 3 comments
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IllegalArgumentException creating Array[Array[Unit]] #5680

scabug opened this issue Apr 18, 2012 · 3 comments
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@xeno-by
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2.10.0-M2

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@scabug
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scabug commented Apr 18, 2012

in both 2.9 and trunk,

scala> Array.fill(1)(Array(()))
java.lang.IllegalArgumentException
	at java.lang.reflect.Array.newArray(Native Method)
	at java.lang.reflect.Array.newInstance(Array.java:52)
	at scala.reflect.ClassManifest$class.arrayClass(ClassManifest.scala:107)
	at scala.reflect.Manifest$$anon$9.arrayClass(Manifest.scala:152)
	at scala.reflect.Manifest$class.arrayManifest(Manifest.scala:46)
	at scala.reflect.Manifest$$anon$9.arrayManifest(Manifest.scala:152)
	at scala.reflect.Manifest$$anon$9.arrayManifest(Manifest.scala:152)
	at scala.reflect.ClassManifest$.arrayType(ClassManifest.scala:205)
	at .<init>(<console>:8)

I know that Array[Array[Unit]] doesn't seem useful or important, but, a friend of mine who's learning Scala actually hit this on his first day with the language. It can easily happen if you accidentally omit an equals sign in a method declaration, something like:

def foo(x: Int, y: Int) { x + y }; Array.tabulate(3, 3)(foo)
@scabug
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scabug commented Apr 18, 2012

Imported From: https://issues.scala-lang.org/browse/SI-5680?orig=1
Reporter: @SethTisue
Affected Versions: 2.9.2, 2.10.0
Other Milestones: 2.10.0-M3

@scabug
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scabug commented Apr 24, 2012

@xeno-by said:
Fixed in scala/scala@be11c92

@scabug scabug closed this as completed Apr 24, 2012
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scabug commented Apr 24, 2012

@SethTisue said:
awesome. thanks!

@scabug scabug added this to the 2.10.0-M2 milestone Apr 7, 2017
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