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Implicit and hiding warnings interact #9850

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scabug opened this issue Jul 8, 2016 · 1 comment
Open

Implicit and hiding warnings interact #9850

scabug opened this issue Jul 8, 2016 · 1 comment
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help wanted usability
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@scabug
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scabug commented Jul 8, 2016

From a test. You don't see the warning that the import is not respected because of the implicit error; unless you uncomment the other import and implicitly.

If errors suppress warnings, then it would be nice if there were a way to always display warnings, for example, under -Xfatal-warnings.

case class K(s: java.lang.String)
class C { implicit val k: K = K("OK?"); override def toString = "C(" + k.toString + ")" }

object Test extends App {
  // uncomment to show the warning
  //import concurrent.ExecutionContext.Implicits._
  //def x = implicitly[concurrent.ExecutionContext]
  val c = new C
  import c.k
  def g = implicitly[K]
  val k = 42
}
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scabug commented Jul 8, 2016

Imported From: https://issues.scala-lang.org/browse/SI-9850?orig=1
Reporter: @som-snytt
Affected Versions: 2.12.0-M5

@scabug scabug added this to the Backlog milestone Apr 7, 2017
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