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Compiler crash when doing structural typing with missing parameter lists #8098

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scabug opened this issue Dec 23, 2013 · 1 comment
Open

Compiler crash when doing structural typing with missing parameter lists #8098

scabug opened this issue Dec 23, 2013 · 1 comment
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backend compiler crash fixed in Scala 3 This issue does not exist in the Scala 3 compiler (https://github.com/lampepfl/dotty/) implicit structural types
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@scabug
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scabug commented Dec 23, 2013 •
edited by SethTisue

The following snippet slays the compiler:

class Foo {
  def duck()(times: Int) = this
}

object Bar {  
  def duckDuckGo[T](t: T { 
    def duck() /* (times: Int) */ : T 
  }) = {}

  duckDuckGo(new Foo())
}
uncaught exception during compilation: scala.reflect.internal.Types$NoCommonType
error: scala.reflect.internal.Types$NoCommonType: lub/glb of incompatible types: (implicit times: Int)Foo and Foo

There were a couple of related errors I came upon whilst trimming down the reproducible, but for now, this seems to be the core issue.
@scabug
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scabug commented Dec 23, 2013

Imported From: https://issues.scala-lang.org/browse/SI-8098?orig=1
Reporter: @melezov
Affected Versions: 2.10.3

@scabug scabug added this to the Backlog milestone Apr 7, 2017
@SethTisue SethTisue added the fixed in Scala 3 This issue does not exist in the Scala 3 compiler (https://github.com/lampepfl/dotty/) label Apr 29, 2023
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backend compiler crash fixed in Scala 3 This issue does not exist in the Scala 3 compiler (https://github.com/lampepfl/dotty/) implicit structural types
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