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Private constructors of case class defined in method body should not be accessible outside of the class/object definitions #8821

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scabug opened this issue Aug 25, 2014 · 4 comments
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Private constructors of case class defined in method body should not be accessible outside of the class/object definitions #8821

scabug opened this issue Aug 25, 2014 · 4 comments
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case class
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2.11.8

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@scabug
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scabug commented Aug 25, 2014 •
edited by retronym

A private constructor of case class is only accessible in the class/companion object definition. Trying to access from anywhere else results a compilation error.

// CodeInBody.scala
object CodeInBody {
  case class A private (i: Int)
  val a1 = A(1)    // compilation error
}

Except if the case class is defined in a method body.

// CodeInMethod.scala
object CodeInMethod {
  def f {
    case class A private (i: Int)
    val a1 = A(1)   // no compilation error
  }
}

I would expect the same behavior in both cases.
@scabug
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scabug commented Aug 25, 2014

Imported From: https://issues.scala-lang.org/browse/SI-8821?orig=1
Reporter: @skyluc
Affected Versions: 2.11.2

@scabug
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scabug commented Aug 25, 2014

@skyluc said:
Related Scala IDE worksheet tickets:
scala-ide/scala-worksheet#194
https://scala-ide-portfolio.assembla.com/spaces/scala-ide/tickets/1002237

@scabug
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scabug commented Jul 31, 2015

@jsuereth said:
I think I ran into an instance of this recently with combined vs. separate compilation: https://gist.github.com/jsuereth/bf94458a0d03035b58c3

@scabug
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scabug commented Jun 29, 2016

@som-snytt said:
The related fix makes the behavior uniform.

The equivocation about the apply and the ctor is common parlance:

http://stackoverflow.com/questions/38097490/scala-case-class-private-constructor-isnt-private

@scabug scabug added this to the Backlog milestone Apr 7, 2017
@scabug scabug mentioned this issue Apr 7, 2017
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@SethTisue SethTisue modified the milestones: Backlog, 2.11.8 Aug 31, 2020
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