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package object cannot applied type parameter #9090

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scabug opened this issue Jan 15, 2015 · 2 comments
Closed

package object cannot applied type parameter #9090

scabug opened this issue Jan 15, 2015 · 2 comments
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@retronym
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duplicate infer

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@scabug
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scabug commented Jan 15, 2015 •
edited by retronym

Described here
http://stackoverflow.com/questions/27669605/why-cant-the-compiler-infer-type-parameter-for-package-object-while-it-works-f

// Foo.scala
trait Echo [T] {
  def echo(t: T): Unit
}

trait IntEcho extends Echo[Int] {
  def echo(t: Int) = println(t)
}

object echo extends IntEcho
package object echo1  extends IntEcho

object App extends App {
  echo.echo(1)
  echo1.echo(1)
}

And while I try to compile it( the attachment), it would fail

/tmp $ scalac Foo.scala
Foo.scala:14: error: type mismatch;
 found   : Int(1)
 required: T
  echo1.echo(1)
             ^
one error found
@scabug
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scabug commented Jan 15, 2015

Imported From: https://issues.scala-lang.org/browse/SI-9090?orig=1
Reporter: jilen
Affected Versions: 2.11.4
Attachments:

  • Foo.scala (created on Jan 15, 2015 12:20:18 PM UTC, 237 bytes)

@scabug
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scabug commented Jan 16, 2015

@retronym said:
Merging with #9074 as they fix for the two issues is the same.

@scabug scabug closed this as completed Jan 16, 2015
@scabug scabug mentioned this issue Apr 24, 2017
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@retronym @scabug