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Line nums in stack trace with extension method and delayed init #7594

scabug opened this Issue Jun 19, 2013 · 2 comments


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scabug commented Jun 19, 2013

A test class App loses line number specificity when exception is thrown from value class. Both DelayedInit and AnyVal are required for symptom.

object Test2 extends App {
  implicit class Averrable(val b: Boolean) extends AnyVal {
    def yes = assert(b)
    def no = assert(!b)
  // normal line number
  // at gline.Test2$delayedInit$body.apply(gline.scala:19)
  //throw new RuntimeException

  // line number is start of object Test
  //at scala.Predef$.assert(Predef.scala:165)
  //at gline.Test2$Averrable$.yes$extension(gline.scala:16)
  //at gline.Test2$delayedInit$body.apply(gline.scala:14)

  // same in new encoding
  //at gline.Test2$Averrable$.yes$extension(gline.scala:16)
  //at gline.Test2$.delayedEndpoint$gline$Test2$1(gline.scala:14)
  //at gline.Test2$delayedInit$body.apply(gline.scala:14)

And javap says:

  public final void delayedEndpoint$gline$Test2$1();
      stack=3, locals=1, args_size=1
         0: getstatic     #65                 // Field gline/Test2$Averrable$.MODULE$:Lgline/Test2$Averrable$;
         3: aload_0       
         4: iconst_0      
         5: invokevirtual #67                 // Method Averrable:(Z)Z
         8: invokevirtual #71                 // Method gline/Test2$Averrable$.yes$extension:(Z)V
        11: return        
        Start  Length  Slot  Name   Signature
               0      12     0  this   Lgline/Test2$;
        line 13: 0
        line 26: 3
        line 13: 8

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scabug commented Jun 19, 2013

Imported From:
Reporter: @som-snytt
Affected Versions: 2.10.1, 2.11.0-M3


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scabug commented Jun 9, 2016

@som-snytt said:
Progressed in 2.12. Test at scala/scala#5221

@scabug scabug closed this Jun 9, 2016

@scabug scabug added the quickfix label Apr 7, 2017

@scabug scabug added this to the 2.12.0-M2 milestone Apr 7, 2017

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