Scala Compiler2.13.9 < Back
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# 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 Typers extends Adaptations with Tags with TypersTracking with PatternTypers

  A provider of methods to assign types to trees.

  A provider of methods to assign types to trees.

  Definition Classes
    typechecker
- Adaptation
- PatternTyper
- SilentResult
- SilentResultValue
- SilentTypeError
- Tag
- Typer
- checkNoEscaping
- typingStack

c

scala.tools.nsc.typechecker.Typers

# Typer

###

#### abstract class Typer extends Analyzer.TyperDiagnostics with Analyzer.Adaptation with Analyzer.Tag with Analyzer.PatternTyper with Analyzer.TyperContextErrors

Source
  Typers.scala

Linear Supertypes
Analyzer.TyperContextErrors, Analyzer.PatternTyper, Analyzer.Tag, Analyzer.Adaptation, Analyzer.TyperDiagnostics, AnyRef, Any
Known Subclasses
typer, ScaladocTyper, InteractiveTyper, Eraser, BodyDuplicator, ImplicitSearch, TreeChecker, BodyDuplicator
Type Hierarchy

Ordering

1. Alphabetic
2. By Inheritance

Inherited

1. Typer
2. TyperContextErrors
3. PatternTyper
4. Tag
5. Adaptation
6. TyperDiagnostics
7. AnyRef
8. 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 Typer(context0: Analyzer.Context)

### 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.Typer toany2stringadd[Analyzer.Typer] performed by method any2stringadd in scala.Predef.
   Definition Classes
     any2stringadd
5.  def ->[B](y: B): (Analyzer.Typer, B)
   Implicit
     This member is added by an implicit conversion from Analyzer.Typer toArrowAssoc[Analyzer.Typer] performed by method ArrowAssoc in scala.Predef.
   Definition Classes
     ArrowAssoc
   Annotations
     @inline()
6.  final def ==(arg0: Any): Boolean
   Definition Classes
     AnyRef → Any
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 (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
8.  def adaptAfterOverloadResolution(tree: Global.Tree, mode: Mode, pt: Global.Type = WildcardType, original: Global.Tree = EmptyTree): Global.Tree
9.  def adaptCase(cdef: Global.CaseDef, mode: Mode, tpe: Global.Type): Global.CaseDef
10.  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.

11.  def adaptToMember(qual: Global.Tree, searchTemplate: Global.Type, reportAmbiguous: Boolean = true, saveErrors: Boolean = true): Global.Tree
12.  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`.

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.

14.  def analyzeSuperConsructor(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

15.  def applyImplicitArgs(fun: Global.Tree): Global.Tree

    Find implicit arguments and pass them to given tree.

16.  def applyTypeToWildcards(tp: Global.Type): Global.Type
    Definition Classes
      PatternTyper
17.  final def asInstanceOf[T0]: T0
    Definition Classes
      Any
18.  def atOwner(tree: Global.Tree, owner: Global.Symbol): Analyzer.Typer
19.  def atOwner(owner: Global.Symbol): Analyzer.Typer
20.  def callToCompanionConstr(context: Analyzer.Context, calledFun: Global.Symbol): Boolean
21.  def canAdaptConstantTypeToLiteral: Boolean

    Overridden to false in scaladoc and/or interactive.

22.  def canTranslateEmptyListToNil: Boolean
23.  def checkClassOrModuleType(tpt: Global.Tree): Boolean

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

24.  def checkExistentialsFeature(pos: Global.Position, tpe: Global.Type, prefix: String): AnyVal
25.  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

26.  def checkFinitary(classinfo: Global.ClassInfoType): Unit
27.  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
28.  def checkNonCyclic(defn: Global.Tree, tpt: Global.Tree): Unit
29.  def checkNonCyclic(sym: Global.Symbol): Unit
30.  def checkNonCyclic(pos: Global.Position, tp: Global.Type, lockedSym: Global.Symbol): Boolean
31.  def checkNonCyclic(pos: Global.Position, tp: Global.Type): Boolean

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

32.  def checkRootOfPackageQualifier(q: Global.Tree): Global.Tree
33.  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.

34.  def checkStablePrefixClassType(tpt: Global.Tree): Boolean

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

35.  def checkValidAdaptation(t: Global.Tree, args: List[Global.Tree]): Boolean
    Definition Classes
      Adaptation
36.  def clone(): AnyRef
    Attributes
      protected[lang]
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.CloneNotSupportedException]) @native()
37.  def computeMacroDefType(ddef: Global.DefDef, pt: Global.Type): Global.Type
38.  def computeType(tree: Global.Tree, pt: Global.Type): Global.Type
39.  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.

40.  var context: Analyzer.Context
41.  def context1: Analyzer.Context
42.  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
43.  def doTypedApply(tree: Global.Tree, fun0: Global.Tree, args: List[Global.Tree], mode: Mode, pt: Global.Type): Global.Tree
44.  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
45.  def dropExistential(tp: Global.Type): Global.Type
46.  def ensuring(cond: (Analyzer.Typer) => Boolean, msg: => Any): Analyzer.Typer
    Implicit
      This member is added by an implicit conversion from Analyzer.Typer toEnsuring[Analyzer.Typer] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
47.  def ensuring(cond: (Analyzer.Typer) => Boolean): Analyzer.Typer
    Implicit
      This member is added by an implicit conversion from Analyzer.Typer toEnsuring[Analyzer.Typer] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
48.  def ensuring(cond: Boolean, msg: => Any): Analyzer.Typer
    Implicit
      This member is added by an implicit conversion from Analyzer.Typer toEnsuring[Analyzer.Typer] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
49.  def ensuring(cond: Boolean): Analyzer.Typer
    Implicit
      This member is added by an implicit conversion from Analyzer.Typer toEnsuring[Analyzer.Typer] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
50.  def enterSym(txt: Analyzer.Context, tree: Global.Tree): Analyzer.Context
    Attributes
      protected
51.  def enterSyms(txt: Analyzer.Context, trees: List[Global.Tree]): Unit
    Attributes
      protected
52.  final def eq(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef
53.  def equals(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef → Any
54.  def extractorForUncheckedType(pos: Global.Position, pt: Global.Type): Global.Tree
    Definition Classes
      PatternTyper
55.  def finalize(): Unit
    Attributes
      protected[lang]
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.Throwable])
56.  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
57.  implicit def fresh: FreshNameCreator
58.  final def getClass(): Class[_ <: AnyRef]
    Definition Classes
      AnyRef → Any
    Annotations
      @native()
59.  def hashCode(): Int
    Definition Classes
      AnyRef → Any
    Annotations
      @native()
60.  val infer: Analyzer.Inferencer
61.  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
62.  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.

63.  def instantiate(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
64.  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.

65.  def instantiatePossiblyExpectingUnit(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
66.  def isCapturedExistential(sym: Global.Symbol): Boolean
67.  final def isInstanceOf[T0]: Boolean
    Definition Classes
      Any
68.  def isReferencedFrom(ctx: Analyzer.Context, sym: Global.Symbol): Boolean
69.  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.

70.  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.

71.  final def lookupTransformed(tree: Global.Tree): Option[Global.Tree]
72.  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
73.  def member(qual: Global.Type, name: Global.Name): Global.Symbol

    The member with given name of given qualifier type

74.  def missingSelectErrorTree(tree: Global.Tree, qual: Global.Tree, name: Global.Name): Global.Tree
75.  def namer: Analyzer.Namer
76.  final def ne(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef
77.  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?

78.  final def notify(): Unit
    Definition Classes
      AnyRef
    Annotations
      @native()
79.  final def notifyAll(): Unit
    Definition Classes
      AnyRef
    Annotations
      @native()
80.  def packCaptured(tpe: Global.Type): Global.Type
81.  def packSymbols(hidden: List[Global.Symbol], tp: Global.Type): Global.Type

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

82.  def packedType(tree: Global.Tree, owner: Global.Symbol): Global.Type

    convert local symbols and skolems to existentials

83.  def packedTypes(trees: List[Global.Tree]): List[Global.Type]
84.  def permanentlyHiddenWarning(pos: Global.Position, hidden: Global.Name, defn: Global.Symbol): Unit
    Definition Classes
      TyperDiagnostics
85.  def phasedAppliedType(sym: Global.Symbol, args: List[Global.Type]): Global.Type
86.  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

87.  def reallyExists(sym: Global.Symbol): Boolean

    Is symbol defined and not stale?

88.  def reenterTypeParams(tparams: List[Global.TypeDef]): List[Global.Symbol]
89.  def reenterValueParams(vparamss: List[List[Global.ValDef]]): Unit
90.  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
91.  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
92.  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
93.  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.

94.  def silent[T](op: (Analyzer.Typer) => T, reportAmbiguousErrors: Boolean = context.ambiguousErrors, newtree: Global.Tree = context.tree): Analyzer.SilentResult[T]
95.  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
96.  def stabilizeFun(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
97.  final def synchronized[T0](arg0: => T0): T0
    Definition Classes
      AnyRef
98.  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

99.  def toString(): String
    Definition Classes
      AnyRef → Any
100.  final def transformedOr(tree: Global.Tree, op: => Global.Tree): Global.Tree
     Annotations
       @inline()
101.  final def transformedOrTyped(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
     Annotations
       @inline()
102.  final def typed(tree: Global.Tree, mode: Mode): Global.Tree
     Annotations
       @inline()
103.  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`.

     Annotations
       @inline()
104.  final def typed(tree: Global.Tree): Global.Tree

     Types expression or definition `tree`.

     Types expression or definition `tree`.

     Annotations
       @inline()
105.  def typed(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
106.  def typed1(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
107.  def typedAnnotation(ann: Global.Tree, annotee: Option[Global.Tree], mode: Mode = EXPRmode): Global.AnnotationInfo

     Convert an annotation constructor call into an AnnotationInfo.

108.  def typedArg(arg: Global.Tree, mode: Mode, newmode: Mode, pt: Global.Type): Global.Tree
109.  def typedArgs(args: List[Global.Tree], mode: Mode): collection.immutable.List[Global.Tree]
110.  def typedArgsForFormals(args: List[Global.Tree], formals: List[Global.Type], mode: Mode): List[Global.Tree]
     Definition Classes
       PatternTyper
111.  def typedBlock(block0: Global.Block, mode: Mode, pt: Global.Type): Global.Block
112.  final def typedByValueExpr(tree: Global.Tree, pt: Global.Type = WildcardType): Global.Tree
     Annotations
       @inline()
113.  def typedCase(cdef: Global.CaseDef, pattpe: Global.Type, pt: Global.Type): Global.CaseDef
114.  def typedCases(cases: List[Global.CaseDef], pattp: Global.Type, pt: Global.Type): List[Global.CaseDef]
115.  def typedClassDef(cdef: Global.ClassDef): Global.Tree
116.  def typedClassOf(tree: Global.Tree, tpt: Global.Tree, noGen: Boolean = false): Global.Tree
117.  def typedConstructorPattern(fun0: Global.Tree, pt: Global.Type): Global.Tree
     Definition Classes
       PatternTyper
118.  def typedDefDef(ddef: Global.DefDef): Global.DefDef
119.  def typedDocDef(docDef: Global.DocDef, mode: Mode, pt: Global.Type): Global.Tree
120.  def typedEtaExpansion(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
121.  def typedExistentialTypeTree(tree: Global.ExistentialTypeTree, mode: Mode): Global.Tree
     Attributes
       protected
122.  def typedHigherKindedType(tree: Global.Tree, mode: Mode): Global.Tree
123.  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`

124.  def typedImport(imp: Global.Import): Global.Import
125.  def typedInPattern(tree: Global.Typed, mode: Mode, pt: Global.Type): Global.Tree
     Attributes
       protected
     Definition Classes
       PatternTyper
126.  def typedLabelDef(ldef: Global.LabelDef): Global.LabelDef
127.  def typedMacroAnnotation(cdef: Global.ClassDef): Global.ClassDef
128.  def typedMatch(selector: Global.Tree, cases: List[Global.CaseDef], mode: Mode, pt: Global.Type, tree: Global.Tree = EmptyTree): Global.Match
129.  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.

130.  def typedModuleDef(mdef: Global.ModuleDef): Global.Tree
131.  final def typedOperator(tree: Global.Tree): Global.Tree

     Types function part of an application

     Types function part of an application

     Annotations
       @inline()
132.  final def typedPackageQualifier(tree: Global.Tree): Global.Tree
     Annotations
       @inline()
133.  def typedParentTypes(templ: Global.Template): List[Global.Tree]
134.  def typedPattern(tree: Global.Tree, pt: Global.Type): Global.Tree

     Types a pattern with prototype `pt`

135.  def typedPos(pos: Global.Position)(tree: Global.Tree): Global.Tree
136.  def typedPos(pos: Global.Position, mode: Mode, pt: Global.Type)(tree: Global.Tree): Global.Tree
137.  final def typedQualifier(tree: Global.Tree): Global.Tree
     Annotations
       @inline()
138.  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`.

     Annotations
       @inline()
139.  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`.

     Annotations
       @inline()
140.  def typedRefinement(templ: Global.Template): Unit
141.  def typedStarInPattern(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
     Attributes
       protected
     Definition Classes
       PatternTyper
142.  def typedStats(stats: List[Global.Tree], exprOwner: Global.Symbol): List[Global.Tree]
143.  def typedTemplate(templ0: Global.Template, parents1: List[Global.Tree]): Global.Template
144.  def typedType(tree: Global.Tree): Global.Tree

     Types a (fully parameterized) type tree

145.  def typedType(tree: Global.Tree, mode: Mode): Global.Tree

     Types a (fully parameterized) type tree

146.  def typedTypeApply(tree: Global.Tree, mode: Mode, fun: Global.Tree, args: List[Global.Tree]): Global.Tree
     Attributes
       protected
147.  def typedTypeConstructor(tree: Global.Tree): Global.Tree
148.  def typedTypeConstructor(tree: Global.Tree, mode: Mode): Global.Tree

     Types a type constructor tree used in a new or supertype

149.  def typedTypeDef(tdef: Global.TypeDef): Global.TypeDef
150.  def typedValDef(vdef: Global.ValDef): Global.ValDef
151.  final def typerWithCondLocalContext[T](c: => Analyzer.Context)(cond: Boolean)(f: (Analyzer.Typer) => T): T
     Annotations
       @inline()
152.  final def typerWithLocalContext[T](c: Analyzer.Context)(f: (Analyzer.Typer) => T): T
     Annotations
       @inline()
153.  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.
154.  def viewExists(from: Global.Type, to: Global.Type): Boolean
155.  final def wait(): Unit
     Definition Classes
       AnyRef
     Annotations
       @throws(classOf[java.lang.InterruptedException])
156.  final def wait(arg0: Long, arg1: Int): Unit
     Definition Classes
       AnyRef
     Annotations
       @throws(classOf[java.lang.InterruptedException])
157.  final def wait(arg0: Long): Unit
     Definition Classes
       AnyRef
     Annotations
       @throws(classOf[java.lang.InterruptedException]) @native()
158.  def warnTypeParameterShadow(tparams: List[Global.TypeDef], sym: Global.Symbol): Unit
     Definition Classes
       TyperDiagnostics
159.  final def withCondConstrTyper[T](inConstr: Boolean)(f: (Analyzer.Typer) => T): T
     Annotations
       @inline()
160.  def wrapClassTagUnapply(uncheckedPattern: Global.Tree, classTagExtractor: Global.Tree, pt: Global.Type): Global.Tree
     Definition Classes
       PatternTyper

### Deprecated Value Members

1.  def formatted(fmtstr: String): String
   Implicit
     This member is added by an implicit conversion from Analyzer.Typer toStringFormat[Analyzer.Typer] 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
   Annotations
     @deprecated
   Deprecated

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

3.  def →[B](y: B): (Analyzer.Typer, B)
   Implicit
     This member is added by an implicit conversion from Analyzer.Typer toArrowAssoc[Analyzer.Typer] 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.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.Typer to any2stringadd[Analyzer.Typer]

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

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

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

### Ungrouped