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“No TypeTag available” regression #6649

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scabug opened this issue Nov 11, 2012 · 2 comments
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@scabug scabug commented Nov 11, 2012

In REPL:

scala> import scala.reflect.runtime.universe._
import scala.reflect.runtime.universe._

scala> { class B(b:Int); typeTag[B] }
<console>:11: error: No TypeTag available for B
              { class B(b:Int); typeTag[B] }
                                       ^

In 2.10.0-M7, this compiles fine.

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@scabug scabug commented Nov 11, 2012

Imported From: https://issues.scala-lang.org/browse/SI-6649?orig=1
Reporter: Platon Pronko (rogach)
Affected Versions: 2.10.0-RC1, 2.10.0-RC2

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@scabug scabug commented Nov 11, 2012

@xeno-by said (edited on Nov 11, 2012 11:55:50 AM UTC):
This is intentional. If you run scala with -Xlog-implicits, it will explain the reason:

scala> { class B(b:Int); typeTag[B] }
materializing requested reflect.runtime.universe.type.TypeTag[B] using `package`.this.materializeTypeTag[B](scala.reflect.runtime.`package`.universe)
<console>:30: `package`.this.materializeTypeTag[B](scala.reflect.runtime.`package`.universe) is not a valid implicit value for reflect.runtime.universe.TypeTag[B] because:
failed to typecheck the materialized tag: 
cannot create a TypeTag referring to local class B
              { class B(b:Int); typeTag[B] }
                                       ^
<console>:30: error: No TypeTag available for B
              { class B(b:Int); typeTag[B] }
                                       ^

scala> { class B(b:Int); weakTypeTag[B] }
res0: reflect.runtime.universe.WeakTypeTag[_ <: Object] = WeakTypeTag[B]
@scabug scabug closed this Nov 11, 2012
@scabug scabug added the reflection label Apr 7, 2017
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