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Matching on a singleton type fails with apparently nonsensical error #5406

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scabug opened this issue Jan 25, 2012 · 3 comments
Closed

Matching on a singleton type fails with apparently nonsensical error #5406

scabug opened this issue Jan 25, 2012 · 3 comments
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@scabug scabug commented Jan 25, 2012

scala> object Wuffles
defined module Wuffles

scala> (Some(Wuffles): Option[Wuffles.type]) match { case Some(Wuffles) => println("Woof"); case _ => println("Meow") }
<console>:10: error: pattern type is incompatible with expected type;
 found   : object Wuffles
 required: Wuffles.type
              (Some(Wuffles): Option[Wuffles.type]) match { case Some(Wuffles) => println("Woof"); case _ => println("Meow") }
                                                                      ^

The complaint is seems to be that Wuffles is not of Wuffles.type, but then

scala> Wuffles
res10: Wuffles.type = Wuffles$@11dc088

It seems to have a workaround:

scala> (Some(Wuffles): Option[Wuffles.type]) match { case Some(wuffles: Wuffles.type) => println("Woof"); case _ => println("Meow") }
Woof
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@scabug scabug commented Jan 25, 2012

Imported From: https://issues.scala-lang.org/browse/SI-5406?orig=1
Reporter: @oxbowlakes
Affected Versions: 2.9.1

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@scabug scabug commented Feb 6, 2012

Lars Hupel (larsrh) said:
Still occuring with 2.10-SNAPSHOT (93c2d93f4e7aa).

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@scabug scabug commented Feb 28, 2012

@paulp said:
c11ec6f532

@scabug scabug closed this Feb 28, 2012
@scabug scabug added the patmat label Apr 7, 2017
@scabug scabug added this to the 2.10.0 milestone Apr 7, 2017
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