scala.tools.nsc.typechecker.TreeCheckers

# TreeChecker

###
Related Doc: package TreeCheckers

#### class TreeChecker extends Typer

Source
  TreeCheckers.scala

Linear Supertypes
TreeCheckers.Typer, TreeCheckers.TyperContextErrors, TreeCheckers.PatternTyper, TreeCheckers.Tag, TreeCheckers.Adaptation, TreeCheckers.TyperDiagnostics, AnyRef, Any
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1. Alphabetic
2. By inheritance

Inherited

1. TreeChecker
2. Typer
3. TyperContextErrors
4. PatternTyper
5. Tag
6. Adaptation
7. TyperDiagnostics
8. AnyRef
9. Any

Implicitly

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

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Visibility

1. Public
2. All

### Instance Constructors

1. #### new TreeChecker(context0: TreeCheckers.Context)

### Value Members

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

   Test two objects for inequality.

   Test two objects for inequality.

   returns

     `true` if !(this == that), false otherwise.

   Definition Classes
     AnyRef → Any

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

   Equivalent to `x.hashCode` except for boxed numeric types and `null`.

   Equivalent to `x.hashCode` except for boxed numeric types and `null`. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them. For `null` returns a hashcode where `null.hashCode` throws a `NullPointerException`.

   returns

     a hash value consistent with ==

   Definition Classes
     AnyRef → Any

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

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

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

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

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

   The expression `x == that` is equivalent to `if (x eq null) that eq null else x.equals(that)`.

   The expression `x == that` is equivalent to `if (x eq null) that eq null else x.equals(that)`.

   arg0

     the object to compare against this object for equality.

   returns

     `true` if the receiver object is equivalent to the argument; `false` otherwise.

   Definition Classes
     AnyRef → Any

6. #### object TyperErrorGen

   Definition Classes
     TyperContextErrors

7. #### def adapt(tree: Global.Tree, mode: Mode, pt: Global.Type, original: Global.Tree = EmptyTree): Global.Tree

   Perform the following adaptations of expression, pattern or type `tree` wrt to given mode `mode` and given prototype `pt`: (-1) For expressions with annotated types, let AnnotationCheckers decide what to do (0) Convert expressions with constant types to literals (unless in interactive/scaladoc mode) (1) Resolve overloading, unless mode contains FUNmode (2) Apply parameterless functions (3) Apply polymorphic types to fresh instances of their type parameters and store these instances in context.undetparams, unless followed by explicit type application.

   Perform the following adaptations of expression, pattern or type `tree` wrt to given mode `mode` and given prototype `pt`: (-1) For expressions with annotated types, let AnnotationCheckers decide what to do (0) Convert expressions with constant types to literals (unless in interactive/scaladoc mode) (1) Resolve overloading, unless mode contains FUNmode (2) Apply parameterless functions (3) Apply polymorphic types to fresh instances of their type parameters and store these instances in context.undetparams, unless followed by explicit type application. (4) Do the following to unapplied methods used as values: (4.1) If the method has only implicit parameters pass implicit arguments (4.2) otherwise, if `pt` is a function type and method is not a constructor, convert to function by eta-expansion, (4.3) otherwise, if the method is nullary with a result type compatible to `pt` and it is not a constructor, apply it to () otherwise issue an error (5) Convert constructors in a pattern as follows: (5.1) If constructor refers to a case class factory, set tree's type to the unique instance of its primary constructor that is a subtype of the expected type. (5.2) If constructor refers to an extractor, convert to application of unapply or unapplySeq method.

   (6) Convert all other types to TypeTree nodes. (7) When in TYPEmode but not FUNmode or HKmode, check that types are fully parameterized (7.1) In HKmode, higher-kinded types are allowed, but they must have the expected kind-arity (8) When in both EXPRmode and FUNmode, add apply method calls to values of object type. (9) If there are undetermined type variables and not POLYmode, infer expression instance Then, if tree's type is not a subtype of expected type, try the following adaptations: (10) If the expected type is Byte, Short or Char, and the expression is an integer fitting in the range of that type, convert it to that type. (11) Widen numeric literals to their expected type, if necessary (12) When in mode EXPRmode, convert E to { E; () } if expected type is scala.Unit. (13) When in mode EXPRmode, apply AnnotationChecker conversion if expected type is annotated. (14) When in mode EXPRmode, apply a view If all this fails, error

   Attributes
     protected
   Definition Classes
     Typer

8. #### def adaptAfterOverloadResolution(tree: Global.Tree, mode: Mode, pt: Global.Type = WildcardType, original: Global.Tree = EmptyTree): Global.Tree

   Definition Classes
     Typer

9. #### def adaptCase(cdef: Global.CaseDef, mode: Mode, tpe: Global.Type): Global.CaseDef

   Definition Classes
     Typer

10. #### def adaptToArguments(qual: Global.Tree, name: Global.Name, args: List[Global.Tree], pt: Global.Type, reportAmbiguous: Boolean, saveErrors: Boolean): Global.Tree

    Try to apply an implicit conversion to `qual` to that it contains a method `name` which can be applied to arguments `args` with expected type `pt`.

    Try to apply an implicit conversion to `qual` to that it contains a method `name` which can be applied to arguments `args` with expected type `pt`. If `pt` is defined, there is a fallback to try again with pt = ?. This helps avoiding propagating result information too far and solves #1756. If no conversion is found, return `qual` unchanged.

    Definition Classes
      Typer

11. #### def adaptToMember(qual: Global.Tree, searchTemplate: Global.Type, reportAmbiguous: Boolean = true, saveErrors: Boolean = true): Global.Tree

    Definition Classes
      Typer

12. #### def adaptToMemberWithArgs(tree: Global.Tree, qual: Global.Tree, name: Global.Name, mode: Mode, reportAmbiguous: Boolean, saveErrors: Boolean): Global.Tree

    Try to apply an implicit conversion to `qual` so that it contains a method `name`.

    Try to apply an implicit conversion to `qual` so that it contains a method `name`. If that's ambiguous try taking arguments into account using `adaptToArguments`.

    Definition Classes
      Typer

13. #### def adaptToName(qual: Global.Tree, name: Global.Name): Global.Tree

    Try to apply an implicit conversion to `qual` to that it contains a member `name` of arbitrary type.

    Try to apply an implicit conversion to `qual` to that it contains a member `name` of arbitrary type. If no conversion is found, return `qual` unchanged.

    Definition Classes
      Typer

14. #### def applyImplicitArgs(fun: Global.Tree): Global.Tree

    Find implicit arguments and pass them to given tree.

    Find implicit arguments and pass them to given tree.

    Definition Classes
      Typer

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

    Cast the receiver object to be of type `T0`.

    Cast the receiver object to be of type `T0`.

    Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression `1.asInstanceOf[String]` will throw a `ClassCastException` at runtime, while the expression `List(1).asInstanceOf[List[String]]` will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.

    returns

      the receiver object.

    Definition Classes
      Any
    Exceptions thrown

      `ClassCastException` if the receiver object is not an instance of the erasure of type `T0`.

16. #### def atOwner(tree: Global.Tree, owner: Global.Symbol): TreeCheckers.Typer

    Definition Classes
      Typer

17. #### def atOwner(owner: Global.Symbol): TreeCheckers.Typer

    Definition Classes
      Typer

18. #### def callToCompanionConstr(context: TreeCheckers.Context, calledFun: Global.Symbol): Boolean

    Definition Classes
      Typer

19. #### def canAdaptConstantTypeToLiteral: Boolean

    Overridden to false in scaladoc and/or interactive.

    Overridden to false in scaladoc and/or interactive.

    Definition Classes
      Typer

20. #### def canTranslateEmptyListToNil: Boolean

    Definition Classes
      Typer

21. #### def checkClassType(tpt: Global.Tree): Boolean

    Check that `tpt` refers to a non-refinement class type

    Check that `tpt` refers to a non-refinement class type

    Definition Classes
      Typer

22. #### object checkDead

    Definition Classes
      TyperDiagnostics

23. #### def checkExistentialsFeature(pos: Global.Position, tpe: Global.Type, prefix: String): AnyVal

    Definition Classes
      Typer

24. #### def checkFeature(pos: Global.Position, featureTrait: Global.Symbol, construct: ⇒ String = "", immediate: Boolean = false): Boolean

    Check whether feature given by `featureTrait` is enabled.

    Check whether feature given by `featureTrait` is enabled. If it is not, issue an error or a warning depending on whether the feature is required.

    construct

      A string expression that is substituted for "#" in the feature description string

    immediate

      When set, feature check is run immediately, otherwise it is run at the end of the typechecking run for the enclosing unit. This is done to avoid potential cyclic reference errors by implicits that are forced too early.

    returns

      if feature check is run immediately: true if feature is enabled, false otherwise if feature check is delayed or suppressed because we are past typer: true

    Definition Classes
      Typer

25. #### def checkFinitary(classinfo: Global.ClassInfoType): Unit

    Definition Classes
      Typer

26. #### def checkMethodStructuralCompatible(ddef: Global.DefDef): Unit

    Check if a structurally defined method violates implementation restrictions.

    Check if a structurally defined method violates implementation restrictions. A method cannot be called if it is a non-private member of a refinement type and if its parameter's types are any of:

    - the self-type of the refinement
    - a type member of the refinement
    - an abstract type declared outside of the refinement.
    - an instance of a value class Furthermore, the result type may not be a value class either
    Definition Classes
      Typer

27. #### object checkNoEscaping extends Global.TypeMap

    Check that type of given tree does not contain local or private components.

    Check that type of given tree does not contain local or private components.

    Definition Classes
      Typer

28. #### def checkNonCyclic(defn: Global.Tree, tpt: Global.Tree): Unit

    Definition Classes
      Typer

29. #### def checkNonCyclic(sym: Global.Symbol): Unit

    Definition Classes
      Typer

30. #### def checkNonCyclic(pos: Global.Position, tp: Global.Type, lockedSym: Global.Symbol): Boolean

    Definition Classes
      Typer

31. #### def checkNonCyclic(pos: Global.Position, tp: Global.Type): Boolean

    Check that type `tp` is not a subtype of itself.

    Check that type `tp` is not a subtype of itself.

    Definition Classes
      Typer

32. #### def checkParamsConvertible(tree: Global.Tree, tpe0: Global.Type): Unit

    Definition Classes
      Typer

33. #### def checkStablePrefixClassType(tpt: Global.Tree): Boolean

    Check that `tpt` refers to a class type with a stable prefix.

    Check that `tpt` refers to a class type with a stable prefix.

    Definition Classes
      Typer

34. #### object checkUnused

    Definition Classes
      TyperDiagnostics

35. #### def checkValidAdaptation(t: Global.Tree, args: List[Global.Tree]): Boolean

    Definition Classes
      Adaptation

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

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the `clone` method is platform dependent.

    returns

      a copy of the receiver object.

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

      not specified by SLS as a member of AnyRef

37. #### def computeMacroDefType(ddef: Global.DefDef, pt: Global.Type): Global.Type

    Definition Classes
      Typer

38. #### def computeParamAliases(clazz: Global.Symbol, vparamss: List[List[Global.ValDef]], rhs: Global.Tree): Unit

    Enter all aliases of local parameter accessors.

    Enter all aliases of local parameter accessors.

    Definition Classes
      Typer

39. #### def computeType(tree: Global.Tree, pt: Global.Type): Global.Type

    Definition Classes
      Typer

40. #### final def constrTyperIf(inConstr: Boolean): TreeCheckers.Typer

    The typer for an expression, depending on where we are.

    The typer for an expression, depending on where we are. If we are before a superclass call, this is a typer over a constructor context; otherwise it is the current typer.

    Definition Classes
      Typer

41. #### var context: TreeCheckers.Context

    Definition Classes
      Typer

42. #### def context1: TreeCheckers.Context

    Definition Classes
      Typer

43. #### def cyclicReferenceMessage(sym: Global.Symbol, tree: Global.Tree): Option[String]

    Returns Some(msg) if the given tree is untyped apparently due to a cyclic reference, and None otherwise.

    Returns Some(msg) if the given tree is untyped apparently due to a cyclic reference, and None otherwise.

    Definition Classes
      TyperDiagnostics

44. #### def doTypedApply(tree: Global.Tree, fun0: Global.Tree, args: List[Global.Tree], mode: Mode, pt: Global.Type): Global.Tree

    Definition Classes
      Typer

45. #### def doTypedUnapply(tree: Global.Tree, fun0: Global.Tree, fun: Global.Tree, args: List[Global.Tree], mode: Mode, pt: Global.Type): Global.Tree

    Definition Classes
      PatternTyper

46. #### def dropExistential(tp: Global.Type): Global.Type

    Definition Classes
      Typer

47. #### object dyna

    Definition Classes
      Typer

48. #### def ensuring(cond: (TreeChecker) ⇒ Boolean, msg: ⇒ Any): TreeChecker

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

49. #### def ensuring(cond: (TreeChecker) ⇒ Boolean): TreeChecker

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

50. #### def ensuring(cond: Boolean, msg: ⇒ Any): TreeChecker

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

51. #### def ensuring(cond: Boolean): TreeChecker

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

52. #### def enterSym(txt: TreeCheckers.Context, tree: Global.Tree): TreeCheckers.Context

    Attributes
      protected
    Definition Classes
      Typer

53. #### def enterSyms(txt: TreeCheckers.Context, trees: List[Global.Tree]): Unit

    Attributes
      protected
    Definition Classes
      Typer

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

    Tests whether the argument (`arg0`) is a reference to the receiver object (`this`).

    Tests whether the argument (`arg0`) is a reference to the receiver object (`this`).

    The `eq` method implements an equivalence relation on non-null instances of `AnyRef`, and has three additional properties:

    - It is consistent: for any non-null instances `x` and `y` of type `AnyRef`, multiple invocations of `x.eq(y)` consistently returns `true` or consistently returns `false`.
    - For any non-null instance `x` of type `AnyRef`, `x.eq(null)` and `null.eq(x)` returns `false`.
    - `null.eq(null)` returns `true`.

    When overriding the `equals` or `hashCode` methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (`o1 eq o2`), they should be equal to each other (`o1 == o2`) and they should hash to the same value (`o1.hashCode == o2.hashCode`).

    returns

      `true` if the argument is a reference to the receiver object; `false` otherwise.

    Definition Classes
      AnyRef

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

    The equality method for reference types.

    The equality method for reference types. Default implementation delegates to `eq`.

    See also `equals` in scala.Any.

    returns

      `true` if the receiver object is equivalent to the argument; `false` otherwise.

    Definition Classes
      AnyRef → Any

56. #### def extractorForUncheckedType(pos: Global.Position, pt: Global.Type): Global.Tree

    Definition Classes
      PatternTyper

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

    Called by the garbage collector on the receiver object when there are no more references to the object.

    Called by the garbage collector on the receiver object when there are no more references to the object.

    The details of when and if the `finalize` method is invoked, as well as the interaction between `finalize` and non-local returns and exceptions, are all platform dependent.

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

      not specified by SLS as a member of AnyRef

58. #### def finishMethodSynthesis(templ: Global.Template, clazz: Global.Symbol, context: TreeCheckers.Context): Global.Template

    In order to override this in the TreeCheckers Typer so synthetics aren't re-added all the time, it is exposed here the module/class typing methods go through it.

    In order to override this in the TreeCheckers Typer so synthetics aren't re-added all the time, it is exposed here the module/class typing methods go through it. ...but it turns out it's also the ideal spot for namer/typer coordination for the tricky method synthesis scenarios, so we'll make it that.

    Attributes
      protected
    Definition Classes
      TreeChecker → Typer

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

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

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

    A representation that corresponds to the dynamic class of the receiver object.

    A representation that corresponds to the dynamic class of the receiver object.

    The nature of the representation is platform dependent.

    returns

      a representation that corresponds to the dynamic class of the receiver object.

    Definition Classes
      AnyRef → Any
    Note

      not specified by SLS as a member of AnyRef

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

    The hashCode method for reference types.

    The hashCode method for reference types. See hashCode in scala.Any.

    returns

      the hash code value for this object.

    Definition Classes
      AnyRef → Any

62. #### val infer: TreeCheckers.Inferencer

    Definition Classes
      Typer

63. #### def inferView(tree: Global.Tree, from: Global.Type, to: Global.Type, reportAmbiguous: Boolean, saveErrors: Boolean): Global.Tree

    Infer an implicit conversion (`view`) between two types.

    Infer an implicit conversion (`view`) between two types.

    tree

      The tree which needs to be converted.

    from

      The source type of the conversion

    to

      The target type of the conversion

    reportAmbiguous

      Should ambiguous implicit errors be reported? False iff we search for a view to find out whether one type is coercible to another.

    saveErrors

      Should ambiguous and divergent implicit errors that were buffered during the inference of a view be put into the original buffer. False iff we don't care about them.

    Definition Classes
      Typer

64. #### def inferView(tree: Global.Tree, from: Global.Type, to: Global.Type, reportAmbiguous: Boolean): Global.Tree

    Definition Classes
      Typer

65. #### def instantiate(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree

    Definition Classes
      Typer

66. #### def instantiateExpectingUnit(tree: Global.Tree, mode: Mode): Global.Tree

    If the expected type is Unit: try instantiating type arguments with expected type Unit, but if that fails, try again with pt = WildcardType and discard the expression.

    If the expected type is Unit: try instantiating type arguments with expected type Unit, but if that fails, try again with pt = WildcardType and discard the expression.

    Definition Classes
      Typer

67. #### def instantiatePossiblyExpectingUnit(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree

    Definition Classes
      Typer

68. #### def isCapturedExistential(sym: Global.Symbol): Boolean

    Definition Classes
      Typer

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

    Test whether the dynamic type of the receiver object is `T0`.

    Test whether the dynamic type of the receiver object is `T0`.

    Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression `1.isInstanceOf[String]` will return `false`, while the expression `List(1).isInstanceOf[List[String]]` will return `true`. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the specified type.

    returns

      `true` if the receiver object is an instance of erasure of type `T0`; `false` otherwise.

    Definition Classes
      Any

70. #### def isNamedApplyBlock(tree: Global.Tree): Boolean

    Is `tree` a block created by a named application?

    Is `tree` a block created by a named application?

    Definition Classes
      Typer

71. #### def isReferencedFrom(ctx: TreeCheckers.Context, sym: Global.Symbol): Boolean

    Definition Classes
      Typer

72. #### def isStale(sym: Global.Symbol): Boolean

    A symbol is stale if it is toplevel, to be loaded from a classfile, and the classfile is produced from a sourcefile which is compiled in the current run.

    A symbol is stale if it is toplevel, to be loaded from a classfile, and the classfile is produced from a sourcefile which is compiled in the current run.

    Definition Classes
      Typer

73. #### def labelTyper(ldef: Global.LabelDef): TreeCheckers.Typer

    The typer for a label definition.

    The typer for a label definition. If this is part of a template we first have to enter the label definition.

    Definition Classes
      Typer

74. #### def macroImplementationNotFoundMessage(name: Global.Name): String

    This file will be the death of me.

    This file will be the death of me.

    Attributes
      protected
    Definition Classes
      TyperContextErrors

75. #### def member(qual: Global.Tree, name: Global.Name): Global.Symbol

    The member with given name of given qualifier tree

    The member with given name of given qualifier tree

    Definition Classes
      Typer

76. #### def missingSelectErrorTree(tree: Global.Tree, qual: Global.Tree, name: Global.Name): Global.Tree

    Definition Classes
      Typer

77. #### def namer: TreeCheckers.Namer

    Definition Classes
      Typer

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

    Equivalent to `!(this eq that)`.

    Equivalent to `!(this eq that)`.

    returns

      `true` if the argument is not a reference to the receiver object; `false` otherwise.

    Definition Classes
      AnyRef

79. #### def needsInstantiation(tparams: List[Global.Symbol], formals: List[Global.Type], args: List[Global.Tree]): Boolean

    Does function need to be instantiated, because a missing parameter in an argument closure overlaps with an uninstantiated formal?

    Does function need to be instantiated, because a missing parameter in an argument closure overlaps with an uninstantiated formal?

    Definition Classes
      Typer

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

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Definition Classes
      AnyRef
    Note

      not specified by SLS as a member of AnyRef

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

    Wakes up all threads that are waiting on the receiver object's monitor.

    Wakes up all threads that are waiting on the receiver object's monitor.

    Definition Classes
      AnyRef
    Note

      not specified by SLS as a member of AnyRef

82. #### def packCaptured(tpe: Global.Type): Global.Type

    Definition Classes
      Typer

83. #### def packSymbols(hidden: List[Global.Symbol], tp: Global.Type): Global.Type

    Compute an existential type from raw hidden symbols `syms` and type `tp`

    Compute an existential type from raw hidden symbols `syms` and type `tp`

    Definition Classes
      Typer

84. #### def packedType(tree: Global.Tree, owner: Global.Symbol): Global.Type

    convert local symbols and skolems to existentials

    convert local symbols and skolems to existentials

    Definition Classes
      Typer

85. #### def packedTypes(trees: List[Global.Tree]): List[Global.Type]

    Definition Classes
      Typer

86. #### def permanentlyHiddenWarning(pos: Global.Position, hidden: Global.Name, defn: Global.Symbol): Unit

    Definition Classes
      TyperDiagnostics

87. #### object postcheck extends Global.Traverser

88. #### object precheck extends Global.Traverser with Global.TreeStackTraverser

89. #### def qualifyingClass(tree: Global.Tree, qual: Global.Name, packageOK: Boolean): Global.Symbol

    The qualifying class of a this or super with prefix `qual`.

    The qualifying class of a this or super with prefix `qual`. packageOk is equal false when qualifying class symbol

    Definition Classes
      Typer

90. #### def reallyExists(sym: Global.Symbol): Boolean

    Is symbol defined and not stale?

    Is symbol defined and not stale?

    Definition Classes
      Typer

91. #### def reenterTypeParams(tparams: List[Global.TypeDef]): List[Global.Symbol]

    Definition Classes
      Typer

92. #### def reenterValueParams(vparamss: List[List[Global.ValDef]]): Unit

    Definition Classes
      Typer

93. #### def reportTypeError(context0: TreeCheckers.Context, pos: Global.Position, ex: Global.TypeError): Unit

    Report a type error.

    Report a type error.

    pos

      The position where to report the error

    ex

      The exception that caused the error

    Definition Classes
      TyperDiagnostics

94. #### def resolveClassTag(pos: Global.Position, tp: Global.Type, allowMaterialization: Boolean = true): Global.Tree

    Finds in scope or materializes a ClassTag.

    Finds in scope or materializes a ClassTag. Should be used instead of ClassManifest every time compiler needs to persist an erasure.

    Once upon a time, we had an `ErasureTag` which was to `ClassTag` the same that `WeakTypeTag` is for `TypeTag`. However we found out that we don't really need this concept, so it got removed.

    pos

      Position for error reporting. Please, provide meaningful value.

    tp

      Type we're looking a ClassTag for, e.g. resolveClassTag(pos, IntTpe) will look for ClassTag[Int].

    allowMaterialization

      If true (default) then the resolver is allowed to launch materialization macros when there's no class tag in scope. If false then materialization macros are prohibited from running.

    Definition Classes
      Tag

95. #### def resolveTypeTag(pos: Global.Position, pre: Global.Type, tp: Global.Type, concrete: Boolean, allowMaterialization: Boolean = true): Global.Tree

    Finds in scope or materializes an WeakTypeTag (if `concrete` is false) or a TypeTag (if `concrete` is true).

    Finds in scope or materializes an WeakTypeTag (if `concrete` is false) or a TypeTag (if `concrete` is true).

    pos

      Position for error reporting. Please, provide meaningful value.

    pre

      Prefix that represents a universe this type tag will be bound to. If `pre` is set to `NoType`, then any type tag in scope will do, regardless of its affiliation. If `pre` is set to `NoType`, and tag resolution involves materialization, then `mkRuntimeUniverseRef` will be used.

    tp

      Type we're looking a TypeTag for, e.g. resolveTypeTag(pos, mkRuntimeUniverseRef, IntTpe, false) will look for scala.reflect.runtime.universe.TypeTag[Int].

    concrete

      If true then the result must not contain unresolved (i.e. not spliced) type parameters and abstract type members. If false then the function will always succeed (abstract types will be reified as free types).

    allowMaterialization

      If true (default) then the resolver is allowed to launch materialization macros when there's no type tag in scope. If false then materialization macros are prohibited from running.

    Definition Classes
      Tag

96. #### def rewrappingWrapperTrees(f: (Global.Tree) ⇒ List[Global.Tree]): (Global.Tree) ⇒ List[Global.Tree]

    For flatMapping a list of trees when you want the DocDefs and Annotated to be transparent.

    For flatMapping a list of trees when you want the DocDefs and Annotated to be transparent.

    Definition Classes
      Typer

97. #### val runDefinitions: reflect.internal.Definitions.definitions.RunDefinitions

    Definition Classes
      Typer

98. #### def samToFunctionType(tp: Global.Type, sam: Global.Symbol = NoSymbol): Global.Type

    Convert a SAM type to the corresponding FunctionType, extrapolating BoundedWildcardTypes in the process (no type precision is lost by the extrapolation, but this facilitates dealing with the types arising from Java's use-site variance).

    Convert a SAM type to the corresponding FunctionType, extrapolating BoundedWildcardTypes in the process (no type precision is lost by the extrapolation, but this facilitates dealing with the types arising from Java's use-site variance).

    Definition Classes
      Typer

99. #### def silent[T](op: (TreeCheckers.Typer) ⇒ T, reportAmbiguousErrors: Boolean = context.ambiguousErrors, newtree: Global.Tree = context.tree): TreeCheckers.SilentResult[T]

    Definition Classes
      Typer

100. #### def stabilize(tree: Global.Tree, pre: Global.Type, mode: Mode, pt: Global.Type): Global.Tree

     Post-process an identifier or selection node, performing the following:

     Post-process an identifier or selection node, performing the following:

     1. Check that non-function pattern expressions are stable (ignoring volatility concerns -- SI-6815) (and narrow the type of modules: a module reference in a pattern has type Foo.type, not "object Foo") 2. Check that packages and static modules are not used as values 3. Turn tree type into stable type if possible and required by context. 4. Give getClass calls a more precise type based on the type of the target of the call.
     Attributes
       protected
     Definition Classes
       Typer

101. #### def stabilizeFun(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree

     Definition Classes
       Typer

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

     Definition Classes
       AnyRef

103. #### def synthesizePartialFunction(paramName: Global.TermName, paramPos: Global.Position, paramSynthetic: Boolean, tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree

     synthesize and type check a PartialFunction implementation based on the match in `tree`

     synthesize and type check a PartialFunction implementation based on the match in `tree`

     `param => sel match { cases }` becomes:

     new AbstractPartialFunction[$argTp, $matchResTp] { def applyOrElse[A1 <: $argTp, B1 >: $matchResTp]($param: A1, default: A1 => B1): B1 = $selector match { $cases } def isDefinedAt(x: $argTp): Boolean = $selector match { $casesTrue } }

     TODO: it would be nicer to generate the tree specified above at once and type it as a whole, there are two gotchas:

     - matchResTp may not be known until we've typed the match (can only use resTp when it's fully defined),
       - if we typed the match in isolation first, you'd know its result type, but would have to re-jig the owner structure
       - could we use a type variable for matchResTp and backpatch it?
     - occurrences of `this` in `cases` or `sel` must resolve to the this of the class originally enclosing the match, not of the anonymous partial function subclass

     an alternative TODO: add partial function AST node or equivalent and get rid of this synthesis --> do everything in uncurry (or later) however, note that pattern matching codegen is designed to run *before* uncurry

     Definition Classes
       Typer

104. #### def synthesizeSAMFunction(sam: Global.Symbol, fun: Global.Function, resPt: Global.Type, samClassTp: Global.Type, mode: Mode): Global.Tree

     Synthesize and type check the implementation of a type with a Single Abstract Method

     Synthesize and type check the implementation of a type with a Single Abstract Method

     `{ (p1: T1, ..., pN: TN) => body } : S`

     expands to (where `S` is the expected type that defines a single abstract method named `apply`)

     `{ def apply$body(p1: T1, ..., pN: TN): T = body new S { def apply(p1: T1', ..., pN: TN'): T' = apply$body(p1,..., pN) } }`

     If 'T' is not fully defined, it is inferred by type checking `apply$body` without a result type before type checking the block. The method's inferred result type is used instead of T`. [See test/files/pos/sammy_poly.scala]`

     The `apply` method is identified by the argument `sam`; `S` corresponds to the argument `samClassTp`, and `resPt` is derived from `samClassTp` -- it may be fully defined, or not... If it is not fully defined, we derive `samClassTpFullyDefined` by inferring any unknown type parameters.

     The types T1' ... TN' and T' are derived from the method signature of the sam method, as seen from the fully defined `samClassTpFullyDefined`.

     The function's body is put in a method outside of the class definition to enforce scoping. S's members should not be in scope in `body`.

     The restriction on implicit arguments (neither S's constructor, nor sam may take an implicit argument list), is largely to keep the implementation of type inference (the computation of `samClassTpFullyDefined`) simple.

     NOTE: it would be nicer to not have to type check `apply$body` separately when `T` is not fully defined. However T must be fully defined before we type the instantiation, as it'll end up as a parent type, which must be fully defined. Would be nice to have some kind of mechanism to insert type vars in a block of code, and have the instantiation of the first occurrence propagate to the rest of the block.

     TODO: by-name params scala> trait LazySink { def accept(a: => Any): Unit } defined trait LazySink

     scala> val f: LazySink = (a) => (a, a) f: LazySink = $anonfun$1@1fb26910

     scala> f(println("!")) <console>:10: error: LazySink does not take parameters f(println("!")) ^

     scala> f.accept(println("!")) ! !

     Definition Classes
       Typer

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

     Creates a String representation of this object.

     Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.

     returns

       a String representation of the object.

     Definition Classes
       AnyRef → Any

106. #### def transformedOr(tree: Global.Tree, op: ⇒ Global.Tree): Global.Tree

     Definition Classes
       Typer

107. #### def transformedOrTyped(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree

     Definition Classes
       Typer

108. #### def typed(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree

     Definition Classes
       TreeChecker → Typer

109. #### def typed(tree: Global.Tree, mode: Mode): Global.Tree

     Definition Classes
       Typer

110. #### def typed(tree: Global.Tree, pt: Global.Type): Global.Tree

     Types expression `tree` with given prototype `pt`.

     Types expression `tree` with given prototype `pt`.

     Definition Classes
       Typer

111. #### def typed(tree: Global.Tree): Global.Tree

     Types expression or definition `tree`.

     Types expression or definition `tree`.

     Definition Classes
       Typer

112. #### def typed1(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree

     Definition Classes
       Typer

113. #### def typedAnnotation(ann: Global.Tree, mode: Mode = EXPRmode): Global.AnnotationInfo

     Convert an annotation constructor call into an AnnotationInfo.

     Convert an annotation constructor call into an AnnotationInfo.

     Definition Classes
       Typer

114. #### def typedArg(arg: Global.Tree, mode: Mode, newmode: Mode, pt: Global.Type): Global.Tree

     Definition Classes
       Typer

115. #### def typedArgs(args: List[Global.Tree], mode: Mode): collection.immutable.List[Global.Tree]

     Definition Classes
       Typer

116. #### def typedArgsForFormals(args: List[Global.Tree], formals: List[Global.Type], mode: Mode): List[Global.Tree]

     Definition Classes
       PatternTyper

117. #### def typedBlock(block0: Global.Block, mode: Mode, pt: Global.Type): Global.Block

     Definition Classes
       Typer

118. #### def typedByValueExpr(tree: Global.Tree, pt: Global.Type = WildcardType): Global.Tree

     Definition Classes
       Typer

119. #### def typedCase(cdef: Global.CaseDef, pattpe: Global.Type, pt: Global.Type): Global.CaseDef

     Definition Classes
       Typer

120. #### def typedCases(cases: List[Global.CaseDef], pattp: Global.Type, pt: Global.Type): List[Global.CaseDef]

     Definition Classes
       Typer

121. #### def typedClassDef(cdef: Global.ClassDef): Global.Tree

     Definition Classes
       Typer

122. #### def typedClassOf(tree: Global.Tree, tpt: Global.Tree, noGen: Boolean = false): Global.Tree

     Definition Classes
       Typer

123. #### def typedConstructorPattern(fun0: Global.Tree, pt: Global.Type): Global.Tree

     Definition Classes
       PatternTyper

124. #### def typedDefDef(ddef: Global.DefDef): Global.DefDef

     Definition Classes
       Typer

125. #### def typedDocDef(docDef: Global.DocDef, mode: Mode, pt: Global.Type): Global.Tree

     Definition Classes
       Typer

126. #### def typedExistentialTypeTree(tree: Global.ExistentialTypeTree, mode: Mode): Global.Tree

     Attributes
       protected
     Definition Classes
       Typer

127. #### def typedHigherKindedType(tree: Global.Tree, mode: Mode): Global.Tree

     Definition Classes
       Typer

128. #### def typedHigherKindedType(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree

     Types a higher-kinded type tree -- pt denotes the expected kind and must be one of `Kind.WildCard` and `Kind.FromParams`

     Types a higher-kinded type tree -- pt denotes the expected kind and must be one of `Kind.WildCard` and `Kind.FromParams`

     Definition Classes
       Typer

129. #### def typedImport(imp: Global.Import): Global.Import

     Definition Classes
       Typer

130. #### def typedInPattern(tree: Global.Typed, mode: Mode, pt: Global.Type): Global.Tree

     Attributes
       protected
     Definition Classes
       PatternTyper

131. #### def typedLabelDef(ldef: Global.LabelDef): Global.LabelDef

     Definition Classes
       Typer

132. #### def typedMatch(selector: Global.Tree, cases: List[Global.CaseDef], mode: Mode, pt: Global.Type, tree: Global.Tree = EmptyTree): Global.Match

     Definition Classes
       Typer

133. #### def typedModifiers(mods: Global.Modifiers): Global.Modifiers

     Remove definition annotations from modifiers (they have been saved into the symbol's `annotations` in the type completer / namer)

     Remove definition annotations from modifiers (they have been saved into the symbol's `annotations` in the type completer / namer)

     However reification does need annotation definitions to proceed. Unfortunately, AnnotationInfo doesn't provide enough info to reify it in general case. The biggest problem is with the "atp: Type" field, which cannot be reified in some situations that involve locally defined annotations. See more about that in Reifiers.scala.

     That's why the original tree gets saved into `original` field of AnnotationInfo (happens elsewhere). The field doesn't get pickled/unpickled and exists only during a single compilation run. This simultaneously allows us to reify annotations and to preserve backward compatibility.

     Definition Classes
       Typer

134. #### def typedModuleDef(mdef: Global.ModuleDef): Global.Tree

     Definition Classes
       Typer

135. #### def typedOperator(tree: Global.Tree): Global.Tree

     Types function part of an application

     Types function part of an application

     Definition Classes
       Typer

136. #### def typedParentTypes(templ: Global.Template): List[Global.Tree]

     Definition Classes
       Typer

137. #### def typedPattern(tree: Global.Tree, pt: Global.Type): Global.Tree

     Types a pattern with prototype `pt`

     Types a pattern with prototype `pt`

     Definition Classes
       Typer

138. #### def typedPos(pos: Global.Position)(tree: Global.Tree): Global.Tree

     Definition Classes
       Typer

139. #### def typedPos(pos: Global.Position, mode: Mode, pt: Global.Type)(tree: Global.Tree): Global.Tree

     Definition Classes
       Typer

140. #### def typedQualifier(tree: Global.Tree): Global.Tree

     Definition Classes
       Typer

141. #### def typedQualifier(tree: Global.Tree, mode: Mode): Global.Tree

     Types qualifier `tree` of a select node.

     Types qualifier `tree` of a select node. E.g. is tree occurs in a context like `tree.m`.

     Definition Classes
       Typer

142. #### def typedQualifier(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree

     Types qualifier `tree` of a select node.

     Types qualifier `tree` of a select node. E.g. is tree occurs in a context like `tree.m`.

     Definition Classes
       Typer

143. #### def typedRefinement(templ: Global.Template): Unit

     Definition Classes
       Typer

144. #### def typedStarInPattern(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree

     Attributes
       protected
     Definition Classes
       PatternTyper

145. #### def typedStats(stats: List[Global.Tree], exprOwner: Global.Symbol): List[Global.Tree]

     Definition Classes
       Typer

146. #### def typedTemplate(templ0: Global.Template, parents1: List[Global.Tree]): Global.Template

     Check that inner classes do not inherit from Annotation

     Check that inner classes do not inherit from Annotation

     Definition Classes
       Typer

147. #### def typedType(tree: Global.Tree): Global.Tree

     Types a (fully parameterized) type tree

     Types a (fully parameterized) type tree

     Definition Classes
       Typer

148. #### def typedType(tree: Global.Tree, mode: Mode): Global.Tree

     Types a (fully parameterized) type tree

     Types a (fully parameterized) type tree

     Definition Classes
       Typer

149. #### def typedTypeApply(tree: Global.Tree, mode: Mode, fun: Global.Tree, args: List[Global.Tree]): Global.Tree

     Attributes
       protected
     Definition Classes
       Typer

150. #### def typedTypeConstructor(tree: Global.Tree): Global.Tree

     Definition Classes
       Typer

151. #### def typedTypeConstructor(tree: Global.Tree, mode: Mode): Global.Tree

     Types a type constructor tree used in a new or supertype

     Types a type constructor tree used in a new or supertype

     Definition Classes
       Typer

152. #### def typedTypeDef(tdef: Global.TypeDef): Global.TypeDef

     Definition Classes
       Typer

153. #### def typedValDef(vdef: Global.ValDef): Global.ValDef

     Definition Classes
       Typer

154. #### final def typerWithCondLocalContext[T](c: ⇒ TreeCheckers.Context)(cond: Boolean)(f: (TreeCheckers.Typer) ⇒ T): T

     Definition Classes
       Typer
     Annotations
       @inline()

155. #### final def typerWithLocalContext[T](c: TreeCheckers.Context)(f: (TreeCheckers.Typer) ⇒ T): T

     Definition Classes
       Typer
     Annotations
       @inline()

156. #### def validateParentClasses(parents: List[Global.Tree], selfType: Global.Type): Unit

     Check that

     Check that

     - all parents are class types,
     - first parent class is not a mixin; following classes are mixins,
     - final classes are not inherited,

     - sealed classes are only inherited by classes which are nested within definition of base class, or that occur within same statement sequence,

     - self-type of current class is a subtype of self-type of each parent class.
     - no two parents define same symbol.
     Definition Classes
       Typer

157. #### def viewExists(from: Global.Type, to: Global.Type): Boolean

     Definition Classes
       Typer

158. #### def virtualizedMatch(match_: Global.Match, mode: Mode, pt: Global.Type): Global.Tree

     Definition Classes
       Typer

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

     Definition Classes
       AnyRef
     Annotations
       @throws( ... )

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

     Definition Classes
       AnyRef
     Annotations
       @throws( ... )

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

     Definition Classes
       AnyRef
     Annotations
       @throws( ... )

162. #### def warnTypeParameterShadow(tparams: List[Global.TypeDef], sym: Global.Symbol): Unit

     Definition Classes
       TyperDiagnostics

163. #### final def withCondConstrTyper[T](inConstr: Boolean)(f: (TreeCheckers.Typer) ⇒ T): T

     Definition Classes
       Typer
     Annotations
       @inline()

164. #### def wrapClassTagUnapply(uncheckedPattern: Global.Tree, classTagExtractor: Global.Tree, pt: Global.Type): Global.Tree

     Definition Classes
       PatternTyper

165. #### def →[B](y: B): (TreeChecker, B)

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

### Inherited from TreeCheckers.Typer

### Inherited from TreeCheckers.TyperContextErrors

### Inherited from TreeCheckers.PatternTyper

### Inherited from TreeCheckers.Tag

### Inherited from TreeCheckers.Adaptation

### Inherited from TreeCheckers.TyperDiagnostics

### Inherited from AnyRef

### Inherited from Any

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

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

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

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

### Ungrouped