Re: [scala-user] How to ignore a "side-effecting nullary methods are discouraged" warning?

[Jon Pretty]

+typelevel

I seem to remember we discussed a "suppress warning" annotation for Typelevel Scala at some point that would work around situations like this. I think I wanted to call it @sic, though Lars thought that was too easy and would lead to overliberal usage, so preferred @entschuldigenSieBitte.

We should revive that idea, possibly compromising on @suppressWarning.

Jon

On 8 January 2015 at 12:15, Miles Sabin <mi...@milessabin.com> wrote:

You can change the signature, but unfortunately that just gets you a
different warning,

trait MyCode extends LibraryCode {

  var mutable = 0
  override def someMethod(): Unit = mutable = 1
}

<console>:11: warning: non-nullary method overrides nullary method
         override def someMethod(): Unit = mutable = 1
                      ^
defined trait MyCode

Cheers,


Miles

On Thu, Jan 8, 2015 at 11:50 AM, David Miguel Antunes
<davidbr...@gmail.com> wrote:
> Hi,
>
> I want to compile with "-Xfatal-warnings", but I have a situation where I
> cannot avoid a "side-effecting nullary methods are discouraged" warning:
>
> trait LibraryCode {
>   // This is in a library, I can't change it!:
>   def someMethod: Unit = {}
> }
>
> trait MyCode extends LibraryCode {
>
>   var mutable = 0
>   override def someMethod: Unit = mutable = 1
>   // Compiler says:
>   // side-effecting nullary methods are discouraged: suggest defining as
> `def someMethod()` instead
> }
>
> (I'm overriding a method which is on a library, so I can't change the method
> signature to fix the "side-effecting nullary methods are discouraged"
> warning.)
>
> Is there a way I can ask the compiler to ignore this warning?
>
> Thanks!
> David
>
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Jon Pretty | @propensive

[Som Snytt]

Depending on what you mean by ignore:

$ scalac -Xlint:help
Enable or disable specific warnings
  adapted-args               Warn if an argument list is modified to match the receiver.
  nullary-unit               Warn when nullary methods return Unit.
  inaccessible               Warn about inaccessible types in method signatures.
  nullary-override           Warn when non-nullary `def f()' overrides nullary `def f'.
  infer-any                  Warn when a type argument is inferred to be `Any`.
  missing-interpolator       A string literal appears to be missing an interpolator id.
  doc-detached               A ScalaDoc comment appears to be detached from its element.
  private-shadow             A private field (or class parameter) shadows a superclass field.
  type-parameter-shadow      A local type parameter shadows a type already in scope.
  poly-implicit-overload     Parameterized overloaded implicit methods are not visible as view bounds.
  option-implicit            Option.apply used implicit view.
  delayedinit-select         Selecting member of DelayedInit
  by-name-right-associative  By-name parameter of right associative operator.
  package-object-classes     Class or object defined in package object.
  unsound-match              Pattern match may not be typesafe.
$ scala
Welcome to Scala version 2.11.4 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_11).
Type in expressions to have them evaluated.
Type :help for more information.

scala> :se -Xlint:-nullary-unit,_

scala> trait X { def x = () }
defined trait X

scala> { val hi = 42 ; "$hi, world" }
<console>:8: warning: possible missing interpolator: detected interpolated identifier `$hi`
              { val hi = 42 ; "$hi, world" }
                              ^
res0: String = $hi, world

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[virtualeyes]

-Xlint:-nullary-unit,_

Exactly what I needed with -Yno-adapted-args and -Xfatal-warnings

Thanks ;-)