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Why for (i <- 1 to 10) { s } += i compile and work ? #5582

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scabug opened this issue Mar 17, 2012 · 3 comments
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Why for (i <- 1 to 10) { s } += i compile and work ? #5582

scabug opened this issue Mar 17, 2012 · 3 comments
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@paulp

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@scabug
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scabug commented Mar 17, 2012

Why this code compile and work?

object TestForResults extends App {
  var s = 0
  val a = for (i <- 1 to 10) { s } += i
  println(a)
  println(s)
}

Output will be:

()
55
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scabug commented Mar 17, 2012

Imported From: https://issues.scala-lang.org/browse/SI-5582?orig=1
Reporter: Tomas Shestakov (megaprog)
Affected Versions: 2.9.1

@scabug
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scabug commented Mar 18, 2012

@soc said:
Hi Thomas,

this should have been asked on the mailing list first, probably.

Maybe it makes it a bit more clear, this code is equivalent:

  for (i <- 1 to 10) s += i

The {} is not doing what you expect.

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scabug commented Mar 18, 2012

@paulp said:
I guess "why does this work" has some novelty value. Yes, please don't open bugs without some evidence there is a bug.

@scabug scabug closed this as completed Mar 18, 2012
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