Exception in manifest[Array[Unit]]

[scabug]

manifest[Array[Unit]] throws an exception:

scala> manifest[Array[Unit]]
java.lang.IllegalArgumentException
at java.lang.reflect.Array.newArray(Native Method)
at java.lang.reflect.Array.newInstance(Array.java:70)
at scala.reflect.ClassManifestDeprecatedApis$class.arrayClass(ClassManifestDeprecatedApis.scala:89)
at scala.reflect.AnyValManifest.arrayClass(Manifest.scala:66)
at scala.reflect.Manifest$class.arrayManifest(Manifest.scala:48)
at scala.reflect.AnyValManifest.arrayManifest(Manifest.scala:66)
at scala.reflect.ManifestFactory$.arrayType(Manifest.scala:245)
at .(:8)
at .()
at .(:7)
at .()
at $print()

Debugging shows that it tries to call Array.newArray(Void.TYPE), which obviously fails. This may be minor, since manifests are semi-deprecated, but still unpleasant.

[scabug]

Imported From: https://issues.scala-lang.org/browse/SI-8183?orig=1
Reporter: @alexeyr
Affected Versions: 2.10.3

[scabug]

@retronym said:
ClassTag gets this right:

scala> reflect.classTag[Array[Unit]].erasure
warning: there were 1 deprecation warning(s); re-run with -deprecation for details
res59: Class[_] = class [Lscala.runtime.BoxedUnit;

ClassTag is already safe to use, unlike TypeTag which invokes the not-yet-thread-safe runtime reflection library.

Marking as wont-fix, as we don't plan to touch manifests any more.