error fix :remove unsed

[He-Pin]

before :

    private var upstreamFailed: OptionVal[Throwable] = OptionVal.None

after

    OptionVal.None

source :akka.stream.impl.fusing.ActorGraphInterpreter.ActorOutputBoundary

[He-Pin]

[marcelocenerine]

@hepin1989, looks like this behavior is intentional (see tests: input / output). The reason is that the the LHS RHS of a val/var definition may contain side effects. Thus, removing the entire line could change the behavior of the program. However, if the LHS RHS is a literal, then the rule does remove the entire thing.

[He-Pin]

@marcelocenerine after you removed that ,Akka did not compile:)

[olafurpg]

@hepin1989 what is the resulting compile error?

We can probably remove the right-hand side if it only references vals. We can try to reproduce what the compiler does

[marcelocenerine]

sorry, I meant RHS in my previous comment.

[marcelocenerine]

The following causes a compiler error:

• Input:

  private val opt: Option[String] = None
  private val num: Integer = { println("foo"); 1 }

• Output:

  None
  { println("foo"); 1 }

None.type does not take parameters
[error]   { println("foo"); 1 }
[error]   ^

[olafurpg]

Aah yes :) that is a good test case! Thank you @marcelocenerine

[He-Pin]

@olafurpg could not find the symbol.

[He-Pin]

@olafurpg I only make use of scalafix for remove the unused import now.the problem presents when I use the default settings.