Scala Compiler2.13.17 < Back


# Packages

-  package root

  The Scala compiler and reflection APIs.

  The Scala compiler and reflection APIs.

  Definition Classes
    root
-  package scala
  Definition Classes
    root
-  package tools
  Definition Classes
    scala
-  package nsc
  Definition Classes
    tools
-  package typechecker
  Definition Classes
    nsc
-  trait Implicits extends SplainData

  This trait provides methods to find various kinds of implicits.

  This trait provides methods to find various kinds of implicits.

  Definition Classes
    typechecker
- Function1
- HasMember
- HasMethodMatching
- ImplicitAmbiguousMsg
- ImplicitAnnotationMsg
- ImplicitError
- ImplicitErrorSpecifics
- ImplicitErrors
- ImplicitInfo
- ImplicitNotFoundMsg
- ImplicitSearch
- Message
- OpenImplicit
- SearchResult
- Shadower

c

scala.tools.nsc.typechecker.Implicits

# ImplicitSearch

###

#### class ImplicitSearch extends Analyzer.Typer with Analyzer.ImplicitsContextErrors

A class that sets up an implicit search. For more info, see comments for `inferImplicit`.

Source
  Implicits.scala

Linear Supertypes
Analyzer.ImplicitsContextErrors, Analyzer.Typer, Analyzer.TyperContextErrors, Analyzer.PatternTyper, Analyzer.Tag, Analyzer.Adaptation, Analyzer.TyperDiagnostics, AnyRef, Any
Type Hierarchy

Ordering

1. Alphabetic
2. By Inheritance

Inherited

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

Implicitly

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

1. Hide All
2. Show All

Visibility

1. Public
2. Protected

### Instance Constructors

1.  new ImplicitSearch(tree: Global.Tree, pt: Global.Type, isView: Boolean, context0: Analyzer.Context, pos0: Global.Position = NoPosition, isByNamePt: Boolean = false)

   tree

     The tree for which the implicit needs to be inserted.

   pt

     The original expected type of the implicit.

   isView

     We are looking for a view

   context0

     The context used for the implicit search

   pos0

     Position that is preferable for use in tracing and error reporting (useful when we infer synthetic stuff and pass EmptyTree in the `tree` argument) If it's set to NoPosition, then position-based services will use `tree.pos`

### Type Members

1.  class ImplicitComputation extends AnyRef

   Prune ImplicitInfos down to either all the eligible ones or the best one.

2.  class NonCyclicStack extends AnyRef
   Definition Classes
     Typer

### Value Members

1.  object TyperErrorGen
   Definition Classes
     TyperContextErrors
2.  final def !=(arg0: Any): Boolean
   Definition Classes
     AnyRef → Any
3.  final def ##: Int
   Definition Classes
     AnyRef → Any
4.  def +(other: String): String
   Implicit
     This member is added by an implicit conversion from Analyzer.ImplicitSearch toany2stringadd[Analyzer.ImplicitSearch] performed by method any2stringadd in scala.Predef.
   Definition Classes
     any2stringadd
5.  def ->[B](y: B): (Analyzer.ImplicitSearch, B)
   Implicit
     This member is added by an implicit conversion from Analyzer.ImplicitSearch toArrowAssoc[Analyzer.ImplicitSearch] performed by method ArrowAssoc in scala.Predef.
   Definition Classes
     ArrowAssoc
   Annotations
     @inline()
6.  final def ==(arg0: Any): Boolean
   Definition Classes
     AnyRef → Any
7.  def AmbiguousImplicitError(info1: Analyzer.ImplicitInfo, tree1: Global.Tree, info2: Analyzer.ImplicitInfo, tree2: Global.Tree, pre1: String, pre2: String, trailer: String)(isView: Boolean, pt: Global.Type, tree: Global.Tree)(implicit context0: Analyzer.Context): Unit
   Definition Classes
     ImplicitsContextErrors
8.  def DivergingImplicitExpansionError(tree: Global.Tree, pt: Global.Type, sym: Global.Symbol)(implicit context0: Analyzer.Context): Unit
   Definition Classes
     ImplicitsContextErrors
9.  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 (see adaptToImplicitMethod) (4.2) otherwise, if the method is 0-ary and it can be auto-applied (see checkCanAutoApply), apply it to () (4.3) otherwise, if the method is not a constructor, and can be eta-expanded (see checkCanEtaExpand), eta-expand 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, do SAM conversion (15) When in mode EXPRmode, apply a view If all this fails, error

   Note: the `original` tree parameter is for re-typing implicit method invocations (see below) and should not be used otherwise. TODO: can it be replaced with a tree attachment?

   Attributes
     protected
   Definition Classes
     Typer
10.  def adaptAfterOverloadResolution(tree: Global.Tree, mode: Mode, pt: Global.Type = WildcardType, original: Global.Tree = EmptyTree): Global.Tree
    Definition Classes
      Typer
11.  def adaptCase(cdef: Global.CaseDef, mode: Mode, tpe: Global.Type): Global.CaseDef
    Definition Classes
      Typer
12.  def adaptToArguments(qual: Global.Tree, name: Global.Name, args: List[Global.Tree], pt: Global.Type, reportAmbiguous: Boolean = true, saveErrors: Boolean = true): 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
13.  def adaptToMember(qual: Global.Tree, searchTemplate: Global.Type, reportAmbiguous: Boolean = true, saveErrors: Boolean = true): Global.Tree
    Definition Classes
      Typer
14.  def adaptToMemberWithArgs(tree: Global.Tree, qual: Global.Tree, name: Global.Name, mode: Mode, reportAmbiguous: Boolean = true, saveErrors: Boolean = true): 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
15.  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
16.  def allImplicits: List[Analyzer.SearchResult]
17.  def allImplicitsPoly(tvars: List[Global.TypeVar]): List[(Analyzer.SearchResult, List[Global.TypeConstraint])]
18.  def analyzeSuperConstructor(meth: Global.Symbol, vparamss: List[List[Global.ValDef]], rhs: Global.Tree): Unit

    Analyze the super constructor call to record information used later to compute parameter aliases

    Analyze the super constructor call to record information used later to compute parameter aliases

    Definition Classes
      Typer
19.  def applicableInfos(iss: Analyzer.Infoss, isLocalToCallsite: Boolean): LinkedHashMap[Analyzer.ImplicitInfo, Analyzer.SearchResult]

    Computes from a list of lists of implicit infos a map which takes infos which are applicable for given expected type `pt` to their attributed trees.

    Computes from a list of lists of implicit infos a map which takes infos which are applicable for given expected type `pt` to their attributed trees.

    iss

      The given list of lists of implicit infos

    isLocalToCallsite

      Is implicit definition visible without prefix? If this is the case then symbols in preceding lists shadow symbols of the same name in succeeding lists.

    returns

      map from infos to search results

20.  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
21.  def applyTypeToWildcards(tp: Global.Type): Global.Type
    Definition Classes
      PatternTyper
22.  def approximate(tp: Global.Type): Global.Type

    The expected type with all undetermined type parameters replaced with wildcards.

23.  final def asInstanceOf[T0]: T0
    Definition Classes
      Any
24.  def atOwner(tree: Global.Tree, owner: Global.Symbol): Analyzer.Typer
    Definition Classes
      Typer
25.  def atOwner(owner: Global.Symbol): Analyzer.Typer
    Definition Classes
      Typer
26.  def bestImplicit: Analyzer.SearchResult

    The result of the implicit search: First search implicits visible in current context.

    The result of the implicit search: First search implicits visible in current context. If that fails, search implicits in expected type `pt`.

    todo. the following lines should be deleted after we migrate delegate tag materialization to implicit macros If that fails, and `pt` is an instance of a ClassTag, try to construct a class tag. If that fails, and `pt` is an instance of a TypeTag, try to construct a type tag. If that fails, and `pt` is an instance of a ClassManifest, try to construct a class manifest. If that fails, and `pt` is an instance of a Manifest, try to construct a manifest. If that fails, and `pt` is an instance of a OptManifest, try to construct a class manifest and return NoManifest if construction fails. If all fails return SearchFailure

27.  def callToCompanionConstr(context: Analyzer.Context, calledFun: Global.Symbol): Boolean
    Definition Classes
      Typer
28.  def canAdaptConstantTypeToLiteral: Boolean
    Definition Classes
      Typer
29.  def canTranslateEmptyListToNil: Boolean
    Definition Classes
      Typer
30.  def checkClassOrModuleType(tpt: Global.Tree): Boolean

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

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

    Definition Classes
      Typer
31.  def checkExistentialsFeature(pos: Global.Position, tpe: Global.Type, prefix: String): AnyVal
    Definition Classes
      Typer
32.  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
33.  def checkFinitary(classinfo: Global.ClassInfoType): Unit
    Definition Classes
      Typer
34.  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
35.  def checkNoEscapingPrivates(typer: Analyzer.Typer, owner: Global.Symbol, tree: Global.Tree): Global.Tree

    Check that type `tree` does not refer to private components unless itself is wrapped in something private (`owner` tells where the type occurs).

    Check that type `tree` does not refer to private components unless itself is wrapped in something private (`owner` tells where the type occurs).

    Definition Classes
      TyperDiagnostics
36.  def checkNonCyclic(defn: Global.ValOrDefDef, tpt: Global.Tree): Unit
    Definition Classes
      Typer
37.  def checkNonCyclic(sym: Global.Symbol): Unit
    Definition Classes
      Typer
38.  def checkNonCyclic(pos: Global.Position, tp: Global.Type, stack: NonCyclicStack = new NonCyclicStack): Boolean

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

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

    Definition Classes
      Typer
39.  def checkRootOfPackageQualifier(q: Global.Tree): Global.Tree
    Definition Classes
      Typer
40.  def checkRootOfQualifier(q: Global.Tree, mode: Mode): Global.Tree

    If import from path starting with _root_, warn if there is a _root_ value in scope, and ensure _root_ can only be the root package in that position.

    If import from path starting with _root_, warn if there is a _root_ value in scope, and ensure _root_ can only be the root package in that position.

    Definition Classes
      Typer
41.  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
42.  def checkValidAdaptation(t: Global.Tree, args: List[Global.Tree]): Boolean
    Definition Classes
      Adaptation
43.  def clone(): AnyRef
    Attributes
      protected[lang]
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.CloneNotSupportedException]) @native()
44.  def computeMacroDefType(ddef: Global.DefDef, pt: Global.Type): Global.Type
    Definition Classes
      Typer
45.  def computeType(tree: Global.Tree, pt: Global.Type): Global.Type
    Definition Classes
      Typer
46.  final def constrTyperIf(inConstr: Boolean): Analyzer.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
47.  var context: Analyzer.Context
    Definition Classes
      Typer
48.  val context0: Analyzer.Context
49.  def context1: Analyzer.Context
    Definition Classes
      Typer
50.  def ctx_s: String
51.  def cyclicReferenceMessage(sym: Global.Symbol, tree: Global.Tree, trace: Array[Global.Symbol], pos: Global.Position): 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
52.  def doTypedApply(tree: Global.Tree, fun0: Global.Tree, args: List[Global.Tree], mode: Mode, pt: Global.Type): Global.Tree
    Definition Classes
      Typer
53.  def doTypedUnapply(tree: Global.Tree, funOrig: Global.Tree, funOverloadResolved: Global.Tree, args: List[Global.Tree], mode: Mode, pt: Global.Type): Global.Tree
    Definition Classes
      PatternTyper
54.  def dropExistential(tp: Global.Type): Global.Type
    Definition Classes
      Typer
55.  def ensuring(cond: (Analyzer.ImplicitSearch) => Boolean, msg: => Any): Analyzer.ImplicitSearch
    Implicit
      This member is added by an implicit conversion from Analyzer.ImplicitSearch toEnsuring[Analyzer.ImplicitSearch] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
56.  def ensuring(cond: (Analyzer.ImplicitSearch) => Boolean): Analyzer.ImplicitSearch
    Implicit
      This member is added by an implicit conversion from Analyzer.ImplicitSearch toEnsuring[Analyzer.ImplicitSearch] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
57.  def ensuring(cond: Boolean, msg: => Any): Analyzer.ImplicitSearch
    Implicit
      This member is added by an implicit conversion from Analyzer.ImplicitSearch toEnsuring[Analyzer.ImplicitSearch] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
58.  def ensuring(cond: Boolean): Analyzer.ImplicitSearch
    Implicit
      This member is added by an implicit conversion from Analyzer.ImplicitSearch toEnsuring[Analyzer.ImplicitSearch] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
59.  def enterSym(txt: Analyzer.Context, tree: Global.Tree): Analyzer.Context
    Attributes
      protected
    Definition Classes
      Typer
60.  def enterSyms(txt: Analyzer.Context, trees: List[Global.Tree]): Unit
    Attributes
      protected
    Definition Classes
      Typer
61.  final def eq(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef
62.  def equals(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef → Any
63.  def extractorForUncheckedType(pos: Global.Position, pt: Global.Type): Global.Tree
    Definition Classes
      PatternTyper
64.  final def failure(what: Any, reason: => String, pos: Global.Position = this.pos): Analyzer.SearchResult
    Annotations
      @inline()
65.  def finalize(): Unit
    Attributes
      protected[lang]
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.Throwable])
66.  def finishMethodSynthesis(templ: Global.Template, clazz: Global.Symbol, context: Analyzer.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
      Typer
67.  implicit def fresh: FreshNameCreator
    Definition Classes
      Typer
68.  final def functionArity(tp: Global.Type): Int
69.  final def getClass(): Class[_ <: AnyRef]
    Definition Classes
      AnyRef → Any
    Annotations
      @native()
70.  def hashCode(): Int
    Definition Classes
      AnyRef → Any
    Annotations
      @native()
71.  def ignoreSymbols(symbols: Set[Global.Symbol]): Unit
72.  def improves(info1: Analyzer.ImplicitInfo, info2: Analyzer.ImplicitInfo): Boolean

    Is implicit info `info1` better than implicit info `info2`?

73.  val infer: Analyzer.Inferencer
    Definition Classes
      Typer
74.  def inferSamType(fun: Global.Tree, pt: Global.Type, mode: Mode): Boolean

    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.

    Based on a type checked Function node `{ (p1: T1, ..., pN: TN) => body } : S` where `S` is the expected type that defines a single abstract method (call it `apply` for the example), that has signature `(p1: T1', ..., pN: TN'): T'`, synthesize the instantiation of the following anonymous class

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

    The `apply` method is identified by the argument `sam`; `S` corresponds to the argument `pt`, If `pt` 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 (static) method in the class definition to enforce scoping. S's members should not be in scope in `body`. (Putting it in the block outside the class runs into implementation problems described below)

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

    Impl notes:

    - `fun` has a FunctionType, but the expected type `pt` is some SAM type -- let's remedy that
    - `fun` is fully attributed, so we'll have to wrangle some symbols into shape (owner change, vparam syms)
    - after experimentation, it works best to type check function literals fully first and then adapt to a sam type, as opposed to a sam-specific code paths earlier on in type checking (in typedFunction). For one, we want to emit the same bytecode regardless of whether the expected function type is a built-in FunctionN or some SAM type
    Definition Classes
      Typer
75.  def inferView(tree: Global.Tree, from: Global.Type, to: Global.Type, reportAmbiguous: Boolean = true, saveErrors: Boolean = true): 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
76.  def instantiate(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
    Definition Classes
      Typer
77.  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
78.  def instantiatePossiblyExpectingUnit(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
    Definition Classes
      Typer
79.  val isByNamePt: Boolean
80.  def isCapturedExistential(sym: Global.Symbol): Boolean
    Definition Classes
      Typer
81.  final def isInstanceOf[T0]: Boolean
    Definition Classes
      Any
82.  def isInteractive: Boolean

    Overridden to false in scaladoc and/or interactive.

    Overridden to false in scaladoc and/or interactive.

    Definition Classes
      Typer
83.  def isPlausiblyCompatible(tp: Global.Type, pt: Global.Type): Boolean
84.  def isReferencedFrom(ctx: Analyzer.Context, sym: Global.Symbol): Boolean
    Definition Classes
      Typer
85.  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
86.  def isValid(sym: Global.Symbol): Boolean

    Should implicit definition symbol `sym` be considered for applicability testing? This is the case if one of the following holds:

    Should implicit definition symbol `sym` be considered for applicability testing? This is the case if one of the following holds:

    - the symbol's type is initialized
    - the symbol comes from a classfile
    - the symbol comes from a different sourcefile than the current one
    - the symbol and the accessed symbol's definitions come before, and do not contain the closest enclosing definition, // see #3373
    - the symbol's definition is a val, var, or def with an explicit result type The aim of this method is to prevent premature cyclic reference errors by computing the types of only those implicits for which one of these conditions is true.
87.  val isView: Boolean
88.  def labelTyper(ldef: Global.LabelDef): Analyzer.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
89.  final def lookupTransformed(tree: Global.Tree): Option[Global.Tree]
    Definition Classes
      Typer
90.  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
91.  def member(qual: Global.Type, name: Global.Name): Global.Symbol

    The member with given name of given qualifier type

    The member with given name of given qualifier type

    Definition Classes
      Typer
92.  def missingSelectErrorTree(tree: Global.Tree, qual: Global.Tree, name: Global.Name): Global.Tree
    Definition Classes
      Typer
93.  def namer: Analyzer.Namer
    Definition Classes
      Typer
94.  final def ne(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef
95.  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
96.  def normSubType(tp: Global.Type, pt: Global.Type): Boolean
97.  final def notify(): Unit
    Definition Classes
      AnyRef
    Annotations
      @native()
98.  final def notifyAll(): Unit
    Definition Classes
      AnyRef
    Annotations
      @native()
99.  def packCaptured(tpe: Global.Type): Global.Type
    Definition Classes
      Typer
100.  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
101.  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
102.  def packedTypes(trees: List[Global.Tree]): List[Global.Type]
     Definition Classes
       Typer
103.  def permanentlyHiddenWarning(pos: Global.Position, hidden: Global.Name, defn: Global.Symbol): Unit
     Definition Classes
       TyperDiagnostics
104.  def phasedAppliedType(sym: Global.Symbol, args: List[Global.Type]): Global.Type
     Definition Classes
       Typer
105.  def pos: Global.Position
106.  val pos0: Global.Position
107.  val pt: Global.Type
108.  def qualifyingClass(tree: Global.Tree, qual: Global.Name, packageOK: Boolean, immediate: 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
109.  def reallyExists(sym: Global.Symbol): Boolean

     Is symbol defined and not stale?

     Is symbol defined and not stale?

     Definition Classes
       Typer
110.  def reenterTypeParams(tparams: List[Global.TypeDef]): List[Global.Symbol]
     Definition Classes
       Typer
111.  def reenterValueParams(vparamss: List[List[Global.ValDef]]): Unit
     Definition Classes
       Typer
112.  def reportTypeError(context0: Analyzer.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
113.  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.

     returns

       Tree that represents an `scala.reflect.ClassTag` for `tp` if everything is okay. EmptyTree if the result contains unresolved (i.e. not spliced) type parameters and abstract type members. EmptyTree if `allowMaterialization` is false, and there is no class tag in scope.

     Definition Classes
       Tag
114.  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.

     returns

       Tree that represents a `scala.reflect.TypeTag` for `tp` if everything is okay. EmptyTree if `concrete` is true and the result contains unresolved (i.e. not spliced) type parameters and abstract type members. EmptyTree if `allowMaterialization` is false, and there is no array tag in scope.

     Definition Classes
       Tag
115.  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
116.  val searchId: Int
117.  def searchImplicit(implicitInfoss: Analyzer.Infoss, isLocalToCallsite: Boolean): Analyzer.SearchResult

     Search list of implicit info lists for one matching prototype `pt`.

     Search list of implicit info lists for one matching prototype `pt`. If found return a search result with a tree from found implicit info which is typed with expected type `pt`. Otherwise return SearchFailure.

     implicitInfoss

       The given list of lists of implicit infos

     isLocalToCallsite

       Is implicit definition visible without prefix? If this is the case then symbols in preceding lists shadow symbols of the same name in succeeding lists.

118.  def silent[T](op: (Analyzer.Typer) => T, reportAmbiguousErrors: Boolean = context.ambiguousErrors, newtree: Global.Tree = context.tree): Analyzer.SilentResult[T]
     Definition Classes
       Typer
119.  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 -- scala/bug#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
120.  def stabilizeFun(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
     Definition Classes
       Typer
121.  final def synchronized[T0](arg0: => T0): T0
     Definition Classes
       AnyRef
122.  def synthesizePartialFunction(paramName: Global.TermName, paramPos: Global.Position, paramType: Global.Type, 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
123.  def toString(): String
     Definition Classes
       AnyRef → Any
124.  final def transformedOr(tree: Global.Tree, op: => Global.Tree): Global.Tree
     Definition Classes
       Typer
     Annotations
       @inline()
125.  final def transformedOrTyped(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
     Definition Classes
       Typer
     Annotations
       @inline()
126.  val tree: Global.Tree
127.  def tree_s: String
128.  final def typed(tree: Global.Tree, mode: Mode): Global.Tree
     Definition Classes
       Typer
     Annotations
       @inline()
129.  final 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
     Annotations
       @inline()
130.  final def typed(tree: Global.Tree): Global.Tree

     Types expression or definition `tree`.

     Types expression or definition `tree`.

     Definition Classes
       Typer
     Annotations
       @inline()
131.  def typed(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
     Definition Classes
       Typer
132.  def typed1(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
     Definition Classes
       Typer
133.  def typedAnnotation(ann: Global.Tree, annotee: Option[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
134.  def typedArg(arg: Global.Tree, mode: Mode, newmode: Mode, pt: Global.Type): Global.Tree
     Definition Classes
       Typer
135.  def typedArgs(args: List[Global.Tree], mode: Mode): collection.immutable.List[Global.Tree]
     Definition Classes
       Typer
136.  def typedArgsForFormals(args: List[Global.Tree], formals: List[Global.Type], mode: Mode): List[Global.Tree]
     Definition Classes
       PatternTyper
137.  def typedBlock(block0: Global.Block, mode: Mode, pt: Global.Type): Global.Block
     Definition Classes
       Typer
138.  final def typedByValueExpr(tree: Global.Tree, pt: Global.Type = WildcardType): Global.Tree
     Definition Classes
       Typer
     Annotations
       @inline()
139.  def typedCase(cdef: Global.CaseDef, pattpe: Global.Type, pt: Global.Type): Global.CaseDef
     Definition Classes
       Typer
140.  def typedCases(cases: List[Global.CaseDef], pattp: Global.Type, pt: Global.Type): List[Global.CaseDef]
     Definition Classes
       Typer
141.  def typedClassDef(cdef: Global.ClassDef): Global.Tree
     Definition Classes
       Typer
142.  def typedClassOf(tree: Global.Tree, tpt: Global.Tree, noGen: Boolean = false): Global.Tree
     Definition Classes
       Typer
143.  def typedConstructorPattern(fun0: Global.Tree, pt: Global.Type): Global.Tree
     Definition Classes
       PatternTyper
144.  def typedDefDef(ddef: Global.DefDef): Global.DefDef
     Definition Classes
       Typer
145.  def typedDocDef(docDef: Global.DocDef, mode: Mode, pt: Global.Type): Global.Tree
     Definition Classes
       Typer
146.  def typedEtaExpansion(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
     Definition Classes
       Typer
147.  def typedExistentialTypeTree(tree: Global.ExistentialTypeTree, mode: Mode): Global.Tree
     Attributes
       protected
     Definition Classes
       Typer
148.  def typedHigherKindedType(tree: Global.Tree, mode: Mode): Global.Tree
     Definition Classes
       Typer
149.  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
150.  def typedImport(imp: Global.Import): Global.Import
     Definition Classes
       Typer
151.  def typedInPattern(tree: Global.Typed, mode: Mode, pt: Global.Type): Global.Tree
     Attributes
       protected
     Definition Classes
       PatternTyper
152.  def typedLabelDef(ldef: Global.LabelDef): Global.LabelDef
     Definition Classes
       Typer
153.  def typedMacroAnnotation(cdef: Global.ClassDef): Global.ClassDef
     Definition Classes
       Typer
154.  def typedMatch(selector: Global.Tree, cases: List[Global.CaseDef], mode: Mode, pt: Global.Type, tree: Global.Tree = EmptyTree): Global.Match
     Definition Classes
       Typer
155.  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
156.  def typedModuleDef(mdef: Global.ModuleDef): Global.Tree
     Definition Classes
       Typer
157.  final def typedOperator(tree: Global.Tree): Global.Tree

     Types function part of an application

     Types function part of an application

     Definition Classes
       Typer
     Annotations
       @inline()
158.  final def typedPackageQualifier(tree: Global.Tree): Global.Tree
     Definition Classes
       Typer
     Annotations
       @inline()
159.  def typedParentTypes(templ: Global.Template): List[Global.Tree]
     Definition Classes
       Typer
160.  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
161.  def typedPos(pos: Global.Position)(tree: Global.Tree): Global.Tree
     Definition Classes
       Typer
162.  def typedPos(pos: Global.Position, mode: Mode, pt: Global.Type)(tree: Global.Tree): Global.Tree
     Definition Classes
       Typer
163.  final def typedQualifier(tree: Global.Tree): Global.Tree
     Definition Classes
       Typer
     Annotations
       @inline()
164.  final 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
     Annotations
       @inline()
165.  final 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
     Annotations
       @inline()
166.  def typedRefinement(templ: Global.Template): Unit
     Definition Classes
       Typer
167.  def typedStarInPattern(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
     Attributes
       protected
     Definition Classes
       PatternTyper
168.  def typedStats(stats: List[Global.Tree], exprOwner: Global.Symbol): List[Global.Tree]
     Definition Classes
       Typer
169.  def typedTemplate(templ0: Global.Template, parents1: List[Global.Tree]): Global.Template
     Definition Classes
       Typer
170.  def typedType(tree: Global.Tree): Global.Tree

     Types a (fully parameterized) type tree

     Types a (fully parameterized) type tree

     Definition Classes
       Typer
171.  def typedType(tree: Global.Tree, mode: Mode): Global.Tree

     Types a (fully parameterized) type tree

     Types a (fully parameterized) type tree

     Definition Classes
       Typer
172.  def typedTypeApply(tree: Global.Tree, mode: Mode, fun: Global.Tree, args: List[Global.Tree]): Global.Tree
     Attributes
       protected
     Definition Classes
       Typer
173.  def typedTypeConstructor(tree: Global.Tree): Global.Tree
     Definition Classes
       Typer
174.  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
175.  def typedTypeDef(tdef: Global.TypeDef): Global.TypeDef
     Definition Classes
       Typer
176.  def typedValDef(vdef: Global.ValDef): Global.ValDef
     Definition Classes
       Typer
177.  final def typerWithCondLocalContext[T](c: => Analyzer.Context)(cond: Boolean)(f: (Analyzer.Typer) => T): T
     Definition Classes
       Typer
     Annotations
       @inline()
178.  final def typerWithLocalContext[T](c: Analyzer.Context)(f: (Analyzer.Typer) => T): T
     Definition Classes
       Typer
     Annotations
       @inline()
179.  val undetParams: List[Global.Symbol]

     The type parameters to instantiate

180.  def undet_s: String
181.  def validateParentClasses(parents: List[Global.Tree], selfType: Global.Type, clazzIsTrait: Boolean): 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
182.  def viewExists(from: Global.Type, to: Global.Type): Boolean
     Definition Classes
       Typer
183.  final def wait(): Unit
     Definition Classes
       AnyRef
     Annotations
       @throws(classOf[java.lang.InterruptedException])
184.  final def wait(arg0: Long, arg1: Int): Unit
     Definition Classes
       AnyRef
     Annotations
       @throws(classOf[java.lang.InterruptedException])
185.  final def wait(arg0: Long): Unit
     Definition Classes
       AnyRef
     Annotations
       @throws(classOf[java.lang.InterruptedException]) @native()
186.  def warnTypeParameterShadow(tparams: List[Global.TypeDef], sym: Global.Symbol): Unit
     Definition Classes
       TyperDiagnostics
187.  val wildPt: Global.Type
188.  final def withCondConstrTyper[T](inConstr: Boolean)(f: (Analyzer.Typer) => T): T
     Definition Classes
       Typer
     Annotations
       @inline()
189.  def wrapClassTagUnapply(uncheckedPattern: Global.Tree, classTagExtractor: Global.Tree, pt: Global.Type): Global.Tree
     Definition Classes
       PatternTyper
190.  def wrapResult(tree: Global.Tree): Analyzer.SearchResult

### Deprecated Value Members

1.  def formatted(fmtstr: String): String
   Implicit
     This member is added by an implicit conversion from Analyzer.ImplicitSearch toStringFormat[Analyzer.ImplicitSearch] performed by method StringFormat in scala.Predef.
   Definition Classes
     StringFormat
   Annotations
     @deprecated @inline()
   Deprecated

     (Since version 2.12.16) Use `formatString.format(value)` instead of `value.formatted(formatString)`, or use the `f""` string interpolator. In Java 15 and later, `formatted` resolves to the new method in String which has reversed parameters.

2.  def member(qual: Global.Tree, name: Global.Name): Global.Symbol
   Definition Classes
     Typer
   Annotations
     @deprecated
   Deprecated

     (Since version 2.12.9) Use the overload accepting a Type.

3.  def →[B](y: B): (Analyzer.ImplicitSearch, B)
   Implicit
     This member is added by an implicit conversion from Analyzer.ImplicitSearch toArrowAssoc[Analyzer.ImplicitSearch] performed by method ArrowAssoc in scala.Predef.
   Definition Classes
     ArrowAssoc
   Annotations
     @deprecated
   Deprecated

     (Since version 2.13.0) Use `->` instead. If you still wish to display it as one character, consider using a font with programming ligatures such as Fira Code.

### Inherited from Analyzer.ImplicitsContextErrors

### Inherited from Analyzer.Typer

### Inherited from Analyzer.TyperContextErrors

### Inherited from Analyzer.PatternTyper

### Inherited from Analyzer.Tag

### Inherited from Analyzer.Adaptation

### Inherited from Analyzer.TyperDiagnostics

### Inherited from AnyRef

### Inherited from Any

### Inherited by implicit conversion any2stringadd fromAnalyzer.ImplicitSearch to any2stringadd[Analyzer.ImplicitSearch]

### Inherited by implicit conversion StringFormat fromAnalyzer.ImplicitSearch to StringFormat[Analyzer.ImplicitSearch]

### Inherited by implicit conversion Ensuring fromAnalyzer.ImplicitSearch to Ensuring[Analyzer.ImplicitSearch]

### Inherited by implicit conversion ArrowAssoc fromAnalyzer.ImplicitSearch to ArrowAssoc[Analyzer.ImplicitSearch]

### Ungrouped