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compiler crashes trying to infer Bar[A] from Option[Bar[_ >: A]] #9788

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scabug opened this issue May 20, 2016 · 3 comments
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compiler crashes trying to infer Bar[A] from Option[Bar[_ >: A]] #9788

scabug opened this issue May 20, 2016 · 3 comments
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compiler crash duplicate infer minimized

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@scabug
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scabug commented May 20, 2016 

object crash {

  class Bar[A]

  def bar[A](barOpt: Option[Bar[_ >: A]]): Bar[A] = new Bar

  def build[A](barOpt: Option[Bar[_ >: A]]): Bar[A] =
    // fix the crash by inserting "[A]" on the following line                                                      
    bar(barOpt)

}

I put the error message and stack trace in gist here: https://gist.github.com/sullivan-/5e591458f3338ebf4be626cb5a8e91be
@scabug
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scabug commented May 20, 2016

Imported From: https://issues.scala-lang.org/browse/SI-9788?orig=1
Reporter: john sullivan (sullivan)
Affected Versions: 2.10.6, 2.11.7, 2.12.0-M3
See #5559

@scabug
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scabug commented May 20, 2016

john sullivan (sullivan) said:
Just to note, the problem goes away if I change the parameter type from Option[Bar[_ >: A]] to any of the following:

  • Bar[_ >: A]
  • Option[Bar[_]]
  • Option[Bar[A]]

@scabug
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scabug commented Aug 4, 2016

@SethTisue said:
looks like a dupe of #5559 (thanks though for the nicely minimized repro code)

@scabug scabug closed this as completed Aug 4, 2016
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