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Type inference fails for a class instantiation for a refined class #9775

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scabug opened this issue May 14, 2016 · 1 comment
Open

Type inference fails for a class instantiation for a refined class #9775

scabug opened this issue May 14, 2016 · 1 comment
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infer typer
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@scabug
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scabug commented May 14, 2016 

scala> class Foo[T]
defined class Foo

scala> def foo[T](): Foo[T] = new Foo
foo: [T]()Foo[T]

is working, however, when we add a refinement, it doesn't:

scala> def bar[T](): Foo[T] { type U } = new Foo { type U = Int }
<console>:11: error: type mismatch;
 found   : Foo[Nothing]{type U = Int}
 required: Foo[T]{type U}
       def bar[T](): Foo[T] { type U } = new Foo { type U = Int }

as a workaround, it is needed to specify the type explicitly:

scala> def baz[T](): Foo[T] { type U } = new Foo [T] { type U = Int }
baz: [T]()Foo[T]{type U}

(this issue was found while working on #9361)
@scabug
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scabug commented May 14, 2016

Imported From: https://issues.scala-lang.org/browse/SI-9775?orig=1
Reporter: Sarunas Valaskevicius (rakatan)
Affected Versions: 2.11.7
See #9361

@scabug scabug added the quickfix label Apr 7, 2017
@scabug scabug added this to the Backlog milestone Apr 7, 2017
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@SethTisue @gourlaysama @scabug