scala.tools.nsc.typechecker

# TypeDiagnostics

#### trait TypeDiagnostics extends AnyRef

An interface to enable higher configurability of diagnostic messages regarding type errors. This is barely a beginning as error messages are distributed far and wide across the codebase. The plan is to partition error messages into some broad groups and provide some mechanism for being more or less verbose on a selective basis. Possible groups include such examples as

arity errors kind errors variance errors ambiguity errors volatility/stability errors implementation restrictions

And more, and there is plenty of overlap, so it'll be a process.

Self Type
  Analyzer
Version

  1.0

Linear Supertypes
AnyRef, Any
Known Subclasses
Analyzer, Duplicator, Duplicators, Erasure, SpecializationDuplicator, TreeCheckers, erasure, treeChecker
Type Hierarchy Learn more about scaladoc diagrams
Ordering

1. Alphabetic
2. By inheritance

Inherited

1. TypeDiagnostics
2. AnyRef
3. Any

Implicitly

1. by any2stringadd
2. by StringFormat
3. by Ensuring
4. by ArrowAssoc

1. Hide All
2. Show all

Learn more about member selection
Visibility

1. Public
2. All

### Type Members

1. #### case class TypeDiag(tp: Global.Type, sym: Global.Symbol) extends Ordered[Analyzer.TypeDiag] with Product with Serializable

2. #### trait TyperDiagnostics extends AnyRef

### Value Members

1. #### final def !=(arg0: Any): Boolean

   Definition Classes
     AnyRef → Any

2. #### final def ##(): Int

   Definition Classes
     AnyRef → Any

3. #### def +(other: String): String

   Implicit information
     This member is added by an implicit conversion from TypeDiagnostics to any2stringadd[TypeDiagnostics] performed by method any2stringadd in scala.Predef.
   Definition Classes
     any2stringadd

4. #### def ->[B](y: B): (TypeDiagnostics, B)

   Implicit information
     This member is added by an implicit conversion from TypeDiagnostics to ArrowAssoc[TypeDiagnostics] performed by method ArrowAssoc in scala.Predef.
   Definition Classes
     ArrowAssoc
   Annotations
     @inline()

5. #### final def ==(arg0: Any): Boolean

   Definition Classes
     AnyRef → Any

6. #### def abstractVarMessage(sym: Global.Symbol): String

   An explanatory note to be added to error messages when there's a problem with abstract var defs

7. #### def alternatives(tree: Global.Tree): List[Global.Type]

8. #### def alternativesString(tree: Global.Tree): String

9. #### final def asInstanceOf[T0]: T0

   Definition Classes
     Any

10. #### def clone(): AnyRef

    Attributes
      protected[java.lang]
    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

11. #### def decodeWithKind(name: Global.Name, owner: Global.Symbol): String

12. #### def disambiguate(ss: List[String]): collection.immutable.List[String]

13. #### def ensuring(cond: (TypeDiagnostics) ⇒ Boolean, msg: ⇒ Any): TypeDiagnostics

    Implicit information
      This member is added by an implicit conversion from TypeDiagnostics to Ensuring[TypeDiagnostics] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring

14. #### def ensuring(cond: (TypeDiagnostics) ⇒ Boolean): TypeDiagnostics

    Implicit information
      This member is added by an implicit conversion from TypeDiagnostics to Ensuring[TypeDiagnostics] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring

15. #### def ensuring(cond: Boolean, msg: ⇒ Any): TypeDiagnostics

    Implicit information
      This member is added by an implicit conversion from TypeDiagnostics to Ensuring[TypeDiagnostics] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring

16. #### def ensuring(cond: Boolean): TypeDiagnostics

    Implicit information
      This member is added by an implicit conversion from TypeDiagnostics to Ensuring[TypeDiagnostics] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring

17. #### final def eq(arg0: AnyRef): Boolean

    Definition Classes
      AnyRef

18. #### def equals(arg0: Any): Boolean

    Definition Classes
      AnyRef → Any

19. #### final def exampleTuplePattern(names: List[Global.Name]): String

    [a, b, c] => "(a, b, c)" [a, B] => "(param1, param2)" [a, B, c] => "(param1, .

    [a, b, c] => "(a, b, c)" [a, B] => "(param1, param2)" [a, B, c] => "(param1, ..., param2)"

20. #### def existentialContext(tp: Global.Type): String

21. #### def explainAlias(tp: Global.Type): String

22. #### def explainAnyVsAnyRef(found: Global.Type, req: Global.Type): String

23. #### def explainVariance(found: Global.Type, req: Global.Type): String

    Look through the base types of the found type for any which might have been valid subtypes if given conformant type arguments.

    Look through the base types of the found type for any which might have been valid subtypes if given conformant type arguments. Examine those for situations where the type error would have been eliminated if the variance were different. In such cases, append an additional explanatory message.

    TODO: handle type aliases better.

24. #### def finalize(): Unit

    Attributes
      protected[java.lang]
    Definition Classes
      AnyRef
    Annotations
      @throws( classOf[java.lang.Throwable] )

25. #### def formatted(fmtstr: String): String

    Implicit information
      This member is added by an implicit conversion from TypeDiagnostics to StringFormat[TypeDiagnostics] performed by method StringFormat in scala.Predef.
    Definition Classes
      StringFormat
    Annotations
      @inline()

26. #### def foundReqMsg(found: Global.Type, req: Global.Type): String

27. #### final def getClass(): Class[_]

    Definition Classes
      AnyRef → Any

28. #### def hashCode(): Int

    Definition Classes
      AnyRef → Any

29. #### final def isInstanceOf[T0]: Boolean

    Definition Classes
      Any

30. #### def linePrecedes(t1: Global.Tree, t2: Global.Tree): Boolean

31. #### final def ne(arg0: AnyRef): Boolean

    Definition Classes
      AnyRef

32. #### final def notify(): Unit

    Definition Classes
      AnyRef

33. #### final def notifyAll(): Unit

    Definition Classes
      AnyRef

34. #### def posPrecedes(p1: Global.Position, p2: Global.Position): Boolean

    Does the positioned line assigned to t1 precede that of t2?

35. #### def restrictionError(pos: Global.Position, unit: Global.CompilationUnit, msg: String): Unit

36. #### def restrictionWarning(pos: Global.Position, unit: Global.CompilationUnit, msg: String): Unit

    For errors which are artifacts of the implementation: such messages indicate that the restriction may be lifted in the future.

37. #### def setAddendum(pos: Global.Position, msg: () ⇒ String): Unit

38. #### final def synchronized[T0](arg0: ⇒ T0): T0

    Definition Classes
      AnyRef

39. #### def toString(): String

    Definition Classes
      AnyRef → Any

40. #### def treeSymTypeMsg(tree: Global.Tree): String

41. #### def typePatternAdvice(sym: Global.Symbol, ptSym: Global.Symbol): String

42. #### def typingInPattern[T](body: ⇒ T): T

    Devising new ways of communicating error info out of desperation to work on error messages.

    Devising new ways of communicating error info out of desperation to work on error messages. This is used by typedPattern to wrap its business so we can generate a sensible error message when things go south.

43. #### def underlyingSymbol(member: Global.Symbol): Global.Symbol

    The symbol which the given accessor represents (possibly in part).

    The symbol which the given accessor represents (possibly in part). This is used for error messages, where we want to speak in terms of the actual declaration or definition, not in terms of the generated setters and getters.

44. #### final def wait(): Unit

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

45. #### final def wait(arg0: Long, arg1: Int): Unit

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

46. #### final def wait(arg0: Long): Unit

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

47. #### def withAddendum(pos: Global.Position): (String) ⇒ String

48. #### def withDisambiguation[T](locals: List[Global.Symbol], types: Global.Type*)(op: ⇒ T): T

    Given any number of types, alters the name information in the symbols until they can be distinguished from one another: then executes the given code.

    Given any number of types, alters the name information in the symbols until they can be distinguished from one another: then executes the given code. The names are restored and the result is returned.

49. #### def →[B](y: B): (TypeDiagnostics, B)

    Implicit information
      This member is added by an implicit conversion from TypeDiagnostics to ArrowAssoc[TypeDiagnostics] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
      ArrowAssoc

### Inherited from AnyRef

### Inherited from Any

### Inherited by implicit conversion any2stringadd from TypeDiagnostics to any2stringadd[TypeDiagnostics]

### Inherited by implicit conversion StringFormat from TypeDiagnostics to StringFormat[TypeDiagnostics]

### Inherited by implicit conversion Ensuring from TypeDiagnostics to Ensuring[TypeDiagnostics]

### Inherited by implicit conversion ArrowAssoc from TypeDiagnostics to ArrowAssoc[TypeDiagnostics]

### Ungrouped