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type mismatch in ValDef with inferred existential type #4171

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scabug opened this issue Jan 19, 2011 · 10 comments
Closed

type mismatch in ValDef with inferred existential type #4171

scabug opened this issue Jan 19, 2011 · 10 comments
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@scabug scabug commented Jan 19, 2011

scala> val c = { class C; new C { def foo = 1 } }
<console>:5: error: type mismatch;
 found   : $$anon(in value c) where type $$anon(in value c) <: C{def foo: Int}
 required: $$anon(in value c) forSome { type $$anon(in value c) <: C{def foo: Int}; type C <: java.lang.Object with ScalaObject }
       val c = { class C; new C { def foo = 1 } }
           ^

or without an anonymous class:

scala> val a = { class B; class C extends B; new C }
<console>:6: error: type mismatch;
 found   : C(in value a) where type C(in value a) <: B with ScalaObject
 required: C(in value a) forSome { type C(in value a) <: B with ScalaObject; type B <: java.lang.Object with ScalaObject }
       val a = { class B; class C extends B; new C }
           ^
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@scabug scabug commented Jan 19, 2011

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@scabug scabug commented Jan 19, 2011

@paulp said:
Closely related to #1201.

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@scabug scabug commented Jan 26, 2011

@adriaanm said:
see also: #4110

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@scabug scabug commented Jan 26, 2011

@adriaanm said:
see also: #3960

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@scabug scabug commented Jul 7, 2011

@SethTisue said:
#1195, too

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@scabug scabug commented Jul 7, 2011

@SethTisue said:
this slight variant also triggers the error. could be part of the test coverage if a fix is found:

scala> { class A; class B extends A; classOf[B] }
<console>:7: error: type mismatch;
 found   : java.lang.Class[B(in value res4)] where type B(in value res4) <: A with ScalaObject
 required: java.lang.Class[_ <: A with ScalaObject]
       val res4 =
           ^
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@scabug scabug commented Jul 9, 2011

@paulp said:

scala> val c = { class C; new C { def foo = 1 } }
c: ScalaObject{def foo: Int} = $anon$1@7b26c885

scala> c.foo
res0: Int = 1
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@scabug scabug commented Jul 21, 2011

@SethTisue said:
Paul: is your comment meant to imply this is now fixed? I'm not seeing that it is fixed on trunk, as of r25323.

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@scabug scabug commented Jul 21, 2011

@paulp said:
Sorry, that was needlessly opaque. It was meant to show that I have fixed it in principle, but I'd have closed it if I was saying it's fixed. That code is not yet checked in.

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@scabug scabug commented Feb 11, 2012

@soc said:
Closed in scala/scala@c478eb7

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