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False positives on unused variable / class. #11647

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kamilkloch opened this issue Jul 22, 2019 · 0 comments

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@kamilkloch
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commented Jul 22, 2019

Scala 2.12.8.

  1. The following code
 def verify[T](...)(implicit eq: Equality[T]): Unit = {
    class DefaultValueUsedException extends Exception

   scala.util.Try {provider.applyOrElse(idx, throw new DefaultValueUsedException)}
 [...]
}

produces compilation warning:

[warn] ProviderPropertyTests.scala:49:11: local class DefaultValueUsedException is never used
[warn]     class DefaultValueUsedException extends Exception
[warn]  
  1. Shapeless code produces unused variable compilation warning:
[warn] Unzipper.scala:60:4: parameter value gen in method shapelessSeriesUnzipper is never used
[warn]    gen: Generic.Aux[T, V], // captures V - the values of the product type T
[warn]    ^

@lrytz lrytz added the lint label Jul 22, 2019

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