What steps will reproduce the problem (please be specific and use wikiformatting)?

  scala> object MyEnum extends Enumeration {val V1, V2, V3=Value}
defined module MyEnum

scala> MyEnum.values.size
res0: Int = 3

scala> MyEnum.values.mkString
res1: String = V1V2V3

scala> MyEnum.values.size
res2: Int = 4

scala> MyEnum.values.mkString(" ")
res3: String = V1 V2 V3 Value

What is the expected behavior?

MyEnum.values.size should not change.

What do you see instead?

The first time MyEnum.values is iterated over, a new value is added to the enumeration, with name "Value."

What versions of the following are you using?

Scala: 2.8.1 (problem was not present in 2.8.0). Reproduced in scala-2.8.1.r23473-b20101109023137

Java: build 1.6.0_20-b02-279-10M3065

Operating system: Mac OS X 10.6.4