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com.digitalasset.canton

NonUnitForEach

object NonUnitForEach extends WartTraverser

This wart warns when methods scala.collection.IterableOnceOps.foreach and scala.collection.IterableOnceOps.tapEach are used with non-unit valued functions. This is needed because these methods' signature accepts any-valued functions. So -Ywarn-value-discard does not warn about such discarded values.

scala.collection.IterableOnceOps.foreach is also used in for loops without yield and therefore also covers cases such as for { x <- 1 to 10 } { x + 5 }.

Builder operations such as b += ... are identified by their return type this.type and ignored when checking for non-unit return values. This allows common usages such as for { x <- 1 to 10 } { b += x } and for { x <- 1 to 10 } { if (x % 2 == 0) b += x }. This does not work for all usages though; you can force a Unit type by specifying the type argument of scala.collection.IterableOnceOps.foreach and scala.collection.IterableOnceOps.tapEach as in (1 to 10).foreach[Unit] { ... }, or by ascribing Unit as in (1 to 10).foreach { x => f(x): Unit }, or by explicitly discarding the result: (1 to 10).foreach { x => f(x).discard }.

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  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##: Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. def apply(u: WartUniverse): Traverser
    Definition Classes
    NonUnitForEach → WartTraverser
  5. def asAnnotationMacro(c: Context)(annottees: scala.reflect.macros.blackbox.Context.Expr[Any]*): scala.reflect.macros.blackbox.Context.Expr[Any]
    Definition Classes
    WartTraverser
  6. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  7. def asMacro(c: Context)(expr: scala.reflect.macros.blackbox.Context.Expr[Any]): scala.reflect.macros.blackbox.Context.Expr[Any]
    Definition Classes
    WartTraverser
  8. lazy val className: String
    Definition Classes
    WartTraverser
  9. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
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    @throws(classOf[java.lang.CloneNotSupportedException]) @native() @IntrinsicCandidate()
  10. def compose(o: WartTraverser): WartTraverser
    Definition Classes
    WartTraverser
  11. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  12. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  13. def error(u: WartUniverse)(pos: scala.reflect.api.Universe.Position, message: String): Unit
    Definition Classes
    WartTraverser
  14. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @native() @IntrinsicCandidate()
  15. def hasTypeAscription(u: WartUniverse)(tree: scala.reflect.api.Universe.ValOrDefDef): Boolean
    Definition Classes
    WartTraverser
  16. def hasWartAnnotation(u: WartUniverse)(tree: scala.reflect.api.Universe.Tree): Boolean
    Definition Classes
    WartTraverser
  17. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native() @IntrinsicCandidate()
  18. def isAnonymousFunctionName(u: WartUniverse)(t: scala.reflect.api.Universe.TypeName): Boolean
    Definition Classes
    WartTraverser
  19. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  20. def isPrimitive(u: WartUniverse)(t: scala.reflect.api.Universe.Type): Boolean
    Definition Classes
    WartTraverser
  21. def isPrivate(u: WartUniverse)(t: scala.reflect.api.Universe.ValOrDefDef): Boolean
    Definition Classes
    WartTraverser
  22. def isPublic(u: WartUniverse)(t: scala.reflect.api.Universe.ValOrDefDef): Boolean
    Definition Classes
    WartTraverser
  23. def isSynthetic(u: WartUniverse)(t: scala.reflect.api.Universe.Tree): Boolean
    Definition Classes
    WartTraverser
  24. def isSyntheticPartialFunction(u: WartUniverse)(tree: scala.reflect.api.Universe.Tree): Boolean
    Definition Classes
    WartTraverser
  25. def isWartAnnotation(u: WartUniverse)(a: scala.reflect.api.Universe.Annotation): Boolean
    Definition Classes
    WartTraverser
  26. val messageAppliedForeach: String
  27. val messageUnappliedForeach: String
  28. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  29. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @IntrinsicCandidate()
  30. final def notifyAll(): Unit
    Definition Classes
    AnyRef
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    @native() @IntrinsicCandidate()
  31. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  32. def toString(): String
    Definition Classes
    AnyRef → Any
  33. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
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    @throws(classOf[java.lang.InterruptedException])
  34. final def wait(arg0: Long): Unit
    Definition Classes
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    @throws(classOf[java.lang.InterruptedException]) @native()
  35. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  36. def warning(u: WartUniverse)(pos: scala.reflect.api.Universe.Position, message: String): Unit
    Definition Classes
    WartTraverser
  37. lazy val wartName: String
    Definition Classes
    WartTraverser
  38. def wasInferred(u: WartUniverse)(t: scala.reflect.api.Universe.TypeTree): Boolean
    Definition Classes
    WartTraverser

Deprecated Value Members

  1. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable]) @Deprecated @Deprecated
    Deprecated

Inherited from WartTraverser

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