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Existential type for nested type argument fails to match #9300

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scabug opened this issue May 4, 2015 · 3 comments
Open

Existential type for nested type argument fails to match #9300

scabug opened this issue May 4, 2015 · 3 comments
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minimized should compile

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@scabug
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scabug commented May 4, 2015

This fails to compile:

trait Id[E]

class C[TC[_[_]]] {

  val d: Set[Id[TC[I]] forSome { type I[_] }] = ???

  d.contains((???): Id[TC[Id]])

}

The error is

Bug.scala:7: error: type mismatch;
 found   : Id[TC[Id]]
 required: Id[TC[I]] forSome { type I[_] <: Any }
  d.contains((???): Id[TC[Id]])
@scabug
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scabug commented May 4, 2015

Imported From: https://issues.scala-lang.org/browse/SI-9300?orig=1
Reporter: Robin Green (ST_robin_green)
Affected Versions: 2.10.3, 2.11.6
See #4721

@scabug
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scabug commented May 4, 2015

Robin Green (ST_robin_green) said:
The required type in the error message doesn't make sense to me. It says <: Any but a type constructor isn't a subclass of anything.

@scabug
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scabug commented May 4, 2015

Robin Green (ST_robin_green) said:
Possibly related to #4721, although the error message is different.

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