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
Source
TypeDiagnostics.scala
Version

1.0

Linear Supertypes
AnyRef, Any
Known Subclasses
Analyzer, Duplicator, Duplicators, Erasure, TreeCheckers, erasure, treeChecker
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Type Members

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

  2. trait TyperDiagnostics extends AnyRef

Value Members

  1. final def !=(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  2. final def !=(arg0: Any): Boolean

    Definition Classes
    Any

  3. final def ##(): Int

    Definition Classes
    AnyRef → Any

  4. final def ==(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

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

    Definition Classes
    Any

  6. def abstractVarMessage(sym: Symbol): String

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

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

  8. def alternativesString(tree: Tree): String

  9. final def asInstanceOf[T0]: T0

    Definition Classes
    Any

  10. def clone(): AnyRef

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

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

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

  13. final def eq(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  14. def equals(arg0: Any): Boolean

    Definition Classes
    AnyRef → Any

  15. def existentialContext(tp: Type): String

  16. def explainAlias(tp: Type): String

  17. def explainVariance(found: Type, req: 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.

  18. def finalize(): Unit

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

  19. def foundReqMsg(found: Type, req: Type): String

  20. final def getClass(): Class[_]

    Definition Classes
    AnyRef → Any

  21. def hashCode(): Int

    Definition Classes
    AnyRef → Any

  22. final def isInstanceOf[T0]: Boolean

    Definition Classes
    Any

  23. def linePrecedes(t1: Tree, t2: Tree): Boolean

  24. final def ne(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  25. def noErroneousSyms(syms: Symbol*): Boolean

  26. def noErroneousTrees(trees: Tree*): Boolean

  27. def noErroneousTypes(tps: Type*): Boolean

    The common situation of making sure nothing is erroneous could be nicer if Symbols, Types, and Trees all implemented some common interface in which isErroneous and similar would be placed.

  28. final def notify(): Unit

    Definition Classes
    AnyRef

  29. final def notifyAll(): Unit

    Definition Classes
    AnyRef

  30. def posPrecedes(p1: Position, p2: Position): Boolean

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

  31. def restrictionError(pos: Position, unit: CompilationUnit, msg: String): Unit

  32. def restrictionWarning(pos: Position, unit: CompilationUnit, msg: String): Unit

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

  33. def setAddendum(pos: Position, msg: () ⇒ String): Unit

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

    Definition Classes
    AnyRef

  35. def toString(): String

    Definition Classes
    AnyRef → Any

  36. def treeSymTypeMsg(tree: Tree): String

  37. def underlyingSymbol(member: Symbol): 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.

  38. def varianceWord(sym: Symbol): String

  39. final def wait(): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws()

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

    Definition Classes
    AnyRef
    Annotations
    @throws()

  41. final def wait(arg0: Long): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws()

  42. def withAddendum(pos: Position): (String) ⇒ String

  43. def withDisambiguation[T](locals: List[Symbol], types: 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.

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