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, analyzer, 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 alternatives(tree: Tree): List[Type]

  7. def alternativesString(tree: Tree): String

  8. def applyErrorMsg(tree: Tree, msg: String, argtpes: List[Type], pt: Type): 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 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.

  17. def finalize(): Unit

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

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

  19. final def getClass(): java.lang.Class[_]

    Definition Classes
    AnyRef → Any

  20. def hashCode(): Int

    Definition Classes
    AnyRef → Any

  21. def inferError(pos: Position, msg: String): Unit

    It can be quite difficult to know which of the many functions called "error" is being called at any given point in the compiler.

    It can be quite difficult to know which of the many functions called "error" is being called at any given point in the compiler. To alleviate this I am renaming such functions inside this trait based on where it originated.

  22. final def isInstanceOf[T0]: Boolean

    Definition Classes
    Any

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

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

  24. def missingParameterTypeMsg(fun: Tree, vparam: ValDef, pt: Type): String

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

    Definition Classes
    AnyRef

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

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

  28. 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.

  29. def notAMember(sel: Tree, qual: Tree, name: Name): Unit

  30. def notEnoughArgumentsMsg(fun: Tree, missing: List[Symbol]): String

  31. final def notify(): Unit

    Definition Classes
    AnyRef

  32. final def notifyAll(): Unit

    Definition Classes
    AnyRef

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

  34. 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.

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

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

    Definition Classes
    AnyRef

  37. def toString(): String

    Definition Classes
    AnyRef → Any

  38. def treeSymTypeMsg(tree: Tree): String

  39. def varianceWord(sym: Symbol): String

  40. final def wait(): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws()

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

    Definition Classes
    AnyRef
    Annotations
    @throws()

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

    Definition Classes
    AnyRef
    Annotations
    @throws()

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

  44. 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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