2.12 specialization compilation error

[kamilkloch]

Scala 2.12.7, the following snippet compiles:

 class ArrayGeneric[T: ClassTag](private var cacheSize: Int) {
    val arr: Array[T] = Array.ofDim[T](cacheSize)
  }

If we remove @specialized and drop private for cacheSize it compiles as well:

  class ArraySpecialized1[@specialized(Double) T: ClassTag](var cacheSize: Int) {
    val arr: Array[T] = Array.ofDim[T](cacheSize)
  }

If we remove @specialized only, compilation fails.

  class ArraySpecialized2[@specialized(Double) T: ClassTag](var cacheSize: Int) {
    val arr: Array[T] = Array.ofDim[T](cacheSize)
  }

[error] [...]: Int does not take parameters
[error]   val arr: Array[T] = Array.ofDim[T](cacheSize)
[error]                                      ^

[joroKr21]

Still fails in 2.13 - FTR the example that fails is:

  class ArraySpecialized2[@specialized(Double) T: ClassTag](private val cacheSize: Int) {
    val arr: Array[T] = Array.ofDim[T](cacheSize)
  }

I suspect it has to do with retyping val arr: Array[T] = Array.ofDim[T](cacheSize) and cacheSize() gets parens for some reason.