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2.11: -Xlint: in for comprehension, spurious "local val... is never used" warning #7712

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scabug opened this Issue Jul 31, 2013 · 5 comments

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scabug commented Jul 31, 2013

% cat S.scala                                                        
object O {
  for {
    s <- Seq[String]()
    Seq(a) = s.toSeq
  } yield a
}
% /usr/local/scala-2.11.0-M4/bin/scalac -Xlint S.scala               
S.scala:4: warning: local val in value $anonfun is never used
    Seq(a) = s.toSeq
        ^
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scabug commented Jul 31, 2013

Imported From: https://issues.scala-lang.org/browse/SI-7712?orig=1
Reporter: @SethTisue
Affected Versions: 2.11.0-M4
See #7707, #7711

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scabug commented Aug 1, 2013

@SethTisue said:
I'm getting a lot of spurious "unused" warnings with -Xlint and 2.11.0-M4. The details of what produces them are rather various. So far I've opened this ticket plus SI-7711 and SI-7707. I could open a few more with yet different details. Would it be better to keep opening separate tickets, or should we just have one meta-ticket that I add new and different test cases to as I discover them...?

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scabug commented Feb 17, 2014

@retronym said:
PR to disable unused warnings under Xlint: scala/scala#3544

Seth: its okay to add multiple issues, but please the same label to all of them (suggestion "unused-warning")

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scabug commented Feb 18, 2014

@SethTisue said:
awesome — thanks so much.

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scabug commented Jan 6, 2015

@som-snytt said:
Effective -Ywarn-unused per se is separate issue.

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