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classManifest[List[_]] doesn't work under some rare conditions #6329

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scabug opened this issue Sep 6, 2012 · 3 comments
Closed

classManifest[List[_]] doesn't work under some rare conditions #6329

scabug opened this issue Sep 6, 2012 · 3 comments
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@scabug
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@scabug scabug commented Sep 6, 2012

object Test extends App {
  implicit val m1 = classManifest[Int]
  implicit val m2 = classManifest[String]
  println(classManifest[List[_]])
  // same bug happens for: println(classManifest[List[Any]])
}
C:\Projects\Kepler\sandbox @ ticket/6329>myke compile Test.scala
Test.scala:7: error: ambiguous implicit values:
 both value m1 in object Test of type => ClassManifest[Int]
 and value m2 in object Test of type => ClassManifest[String]
 match expected type scala.reflect.OptManifest[Any]
  println(classManifest[List[Any]])
                       ^
one error found
@scabug
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@scabug scabug commented Sep 6, 2012

@scabug
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@scabug scabug commented Sep 6, 2012

@xeno-by said:
OptManifest is covariant in T (no idea why), hence implicit manifests in scope can prevent some manifests from being constructed (for types that are subtypes of the lub of those manifests).

@scabug
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@scabug scabug commented Nov 21, 2013

@retronym said:
The residual test cases pass now, I've graduated them from pending: scala/scala#3175

@scabug scabug closed this Nov 21, 2013
@scabug scabug added this to the 2.11.0-M2 milestone Apr 7, 2017
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