Scala Compiler2.13.18 < 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 transform
  Definition Classes
    nsc
-  abstract class Erasure extends SubComponent with InfoTransform with reflect.internal.transform.Erasure with Analyzer with TypingTransformers with TreeDSL with TypeAdaptingTransformer
  Definition Classes
    transform
- AbsAmbiguousTypeError
- AbsTypeError
- AccessTypeError
- Adaptation
- AdjustedTypeArgs
- AmbiguousImplicitTypeError
- AmbiguousTypeError
- AnalyzerPlugin
- BoxingErasure
- ByNameFormatter
- CODE
- CacheAttachment
- CaseApplyDefaultGetters
- Checkability
- ClassForCaseCompanionAttachment
- ClassMethodSynthesis
- CompleterWrapper
- ConstructorDefaultsAttachment
- Context
- ContextReporter
- ContextWarning
- DefMacroExpander
- DefaultsOfLocalMethodAttachment
- DivergentImplicitTypeError
- DynamicRewriteAttachment
- EnterBridges
- Eraser
- ErasureMap
- ErasureTransformer
- ErrorUtils
- Function1
- FunctionFormatter
- GenerateBridges
- GenericArray
- HasMember
- HasMethodMatching
- HasUnapply
- ImplicitAmbiguousMsg
- ImplicitAnnotationMsg
- ImplicitError
- ImplicitErrorLink
- ImplicitErrorSpecifics
- ImplicitErrorTree
- ImplicitErrors
- ImplicitInfo
- ImplicitNotFoundMsg
- ImplicitSearch
- ImplicitsContextErrors
- ImportContext
- ImportInfo
- InferCheckable
- Inferencer
- InferencerContextErrors
- JavaErasureMap
- JavaReflectionResolvers
- LockingTypeCompleter
- MacroArgs
- MacroExpander
- MacroExpanderAttachment
- MacroExpansionAttachment
- MacroImplBinding
- MacroImplRefAttachment
- MacroPlugin
- MacroRuntimeAttachment
- MacroRuntimeResolver
- Message
- MethodSynth
- NamedApplyBlock
- NamedApplyInfo
- Namer
- NamerContextErrors
- NamesDefaultsErrorsGen
- NoContext
- NoInstance
- NormalTypeError
- OpenImplicit
- OriginalTreeAttachment
- PatternTyper
- Phase
- PolyTypeCompleter
- PosAndMsgTypeError
- Refined
- RefinedFormatter
- RichTree
- Scala2JavaArrayErasure
- Scala3ErasureMap
- ScalaErasureMap
- SearchResult
- Shadower
- SilentResult
- SilentResultValue
- SilentTypeError
- SpecialFormatter
- SpecialScalaErasure
- StdPhase
- SuperArgsAttachment
- SuppressMacroExpansionAttachment
- SymbolCompleterAttachment
- SymbolExpansionAttachment
- SymbolSourceAttachment
- SymbolTypeError
- Tag
- ThicketTransformer
- TreeTypeError
- TupleFormatter
- TypeAdapter
- TypeCompleter
- TypeCompleterBase
- TypeDiag
- TypeErrorWithUnderlyingTree
- TypeErrorWrapper
- TypeParts
- Typer
- TyperContextErrors
- TyperDiagnostics
- TypingTransformer
- UnapplyMemberResult
- UnknownSig
- UnusedPrivates
- WeakSymbolAttachment
- approximateAbstracts
- checkDead
- checkUnused
- instantiate
- javaErasure
- namerFactory
- packageObjects
- specialScalaErasure
- toOrigin
- typerFactory
- typingStack

c

scala.tools.nsc.transform.Erasure

# Eraser

###

#### class Eraser extends Typer

The modifier typer which retypes with erased types.

Source
  Erasure.scala

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

1. Alphabetic
2. By Inheritance

Inherited

1. Eraser
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

1. Hide All
2. Show All

Visibility

1. Public
2. Protected

### Instance Constructors

1.  new Eraser(_context: Erasure.Context)

### Type Members

1.  class NonCyclicStack extends AnyRef
   Definition Classes
     Typer

### Value Members

1.  final def !=(arg0: Any): Boolean
   Definition Classes
     AnyRef → Any
2.  final def ##: Int
   Definition Classes
     AnyRef → Any
3.  def +(other: String): String
   Implicit
     This member is added by an implicit conversion from Eraser toany2stringadd[Eraser] performed by method any2stringadd in scala.Predef.
   Definition Classes
     any2stringadd
4.  def ->[B](y: B): (Eraser, B)
   Implicit
     This member is added by an implicit conversion from Eraser toArrowAssoc[Eraser] performed by method ArrowAssoc in scala.Predef.
   Definition Classes
     ArrowAssoc
   Annotations
     @inline()
5.  final def ==(arg0: Any): Boolean
   Definition Classes
     AnyRef → Any
6.  def adapt(tree: Global.Tree, mode: Mode, pt: Global.Type, original: Global.Tree = EmptyTree): Global.Tree

   A replacement for the standard typer's adapt method.

   A replacement for the standard typer's adapt method.

   Attributes
     protected
   Definition Classes
     Eraser → Typer
7.  def adaptAfterOverloadResolution(tree: Global.Tree, mode: Mode, pt: Global.Type = WildcardType, original: Global.Tree = EmptyTree): Global.Tree
   Definition Classes
     Typer
8.  def adaptCase(cdef: Global.CaseDef, mode: Mode, tpe: Global.Type): Global.CaseDef
   Definition Classes
     Typer
9.  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
10.  def adaptToMember(qual: Global.Tree, searchTemplate: Global.Type, reportAmbiguous: Boolean = true, saveErrors: Boolean = true): Global.Tree
    Definition Classes
      Typer
11.  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
12.  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
13.  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
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.  def applyTypeToWildcards(tp: Global.Type): Global.Type
    Definition Classes
      PatternTyper
16.  final def asInstanceOf[T0]: T0
    Definition Classes
      Any
17.  def atOwner(tree: Global.Tree, owner: Global.Symbol): Erasure.Typer
    Definition Classes
      Typer
18.  def atOwner(owner: Global.Symbol): Erasure.Typer
    Definition Classes
      Typer
19.  def callToCompanionConstr(context: Erasure.Context, calledFun: Global.Symbol): Boolean
    Definition Classes
      Typer
20.  def canAdaptConstantTypeToLiteral: Boolean
    Definition Classes
      Typer
21.  def canTranslateEmptyListToNil: Boolean
    Definition Classes
      Typer
22.  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
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.  def checkNoEscapingPrivates(typer: Erasure.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
28.  def checkNonCyclic(defn: Global.ValOrDefDef, 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, 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
31.  def checkRootOfPackageQualifier(q: Global.Tree): Global.Tree
    Definition Classes
      Typer
32.  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
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.  def checkValidAdaptation(t: Global.Tree, args: List[Global.Tree]): Boolean
    Definition Classes
      Adaptation
35.  def clone(): AnyRef
    Attributes
      protected[lang]
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.CloneNotSupportedException]) @native()
36.  def computeMacroDefType(ddef: Global.DefDef, pt: Global.Type): Global.Type
    Definition Classes
      Typer
37.  def computeType(tree: Global.Tree, pt: Global.Type): Global.Type
    Definition Classes
      Typer
38.  final def constrTyperIf(inConstr: Boolean): Erasure.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
39.  var context: Erasure.Context
    Definition Classes
      Typer
40.  def context1: Erasure.Context
    Definition Classes
      Typer
41.  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
42.  def doTypedApply(tree: Global.Tree, fun0: Global.Tree, args: List[Global.Tree], mode: Mode, pt: Global.Type): Global.Tree
    Definition Classes
      Typer
43.  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
44.  def dropExistential(tp: Global.Type): Global.Type
    Definition Classes
      Typer
45.  def ensuring(cond: (Eraser) => Boolean, msg: => Any): Eraser
    Implicit
      This member is added by an implicit conversion from Eraser toEnsuring[Eraser] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
46.  def ensuring(cond: (Eraser) => Boolean): Eraser
    Implicit
      This member is added by an implicit conversion from Eraser toEnsuring[Eraser] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
47.  def ensuring(cond: Boolean, msg: => Any): Eraser
    Implicit
      This member is added by an implicit conversion from Eraser toEnsuring[Eraser] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
48.  def ensuring(cond: Boolean): Eraser
    Implicit
      This member is added by an implicit conversion from Eraser toEnsuring[Eraser] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
49.  def enterSym(txt: Erasure.Context, tree: Global.Tree): Erasure.Context
    Attributes
      protected
    Definition Classes
      Typer
50.  def enterSyms(txt: Erasure.Context, trees: List[Global.Tree]): Unit
    Attributes
      protected
    Definition Classes
      Typer
51.  final def eq(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef
52.  def equals(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef → Any
53.  def extractorForUncheckedType(pos: Global.Position, pt: Global.Type): Global.Tree
    Definition Classes
      PatternTyper
54.  def finalize(): Unit
    Attributes
      protected[lang]
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.Throwable])
55.  def finishMethodSynthesis(templ: Global.Template, clazz: Global.Symbol, context: Erasure.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
56.  implicit def fresh: FreshNameCreator
    Definition Classes
      Typer
57.  final def getClass(): Class[_ <: AnyRef]
    Definition Classes
      AnyRef → Any
    Annotations
      @native()
58.  def hashCode(): Int
    Definition Classes
      AnyRef → Any
    Annotations
      @native()
59.  val infer: Erasure.Inferencer
    Definition Classes
      Typer
60.  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
61.  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
62.  def instantiate(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
    Definition Classes
      Typer
63.  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
64.  def instantiatePossiblyExpectingUnit(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
    Definition Classes
      Typer
65.  def isCapturedExistential(sym: Global.Symbol): Boolean
    Definition Classes
      Typer
66.  final def isInstanceOf[T0]: Boolean
    Definition Classes
      Any
67.  def isInteractive: Boolean

    Overridden to false in scaladoc and/or interactive.

    Overridden to false in scaladoc and/or interactive.

    Definition Classes
      Typer
68.  def isReferencedFrom(ctx: Erasure.Context, sym: Global.Symbol): Boolean
    Definition Classes
      Typer
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.

    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
70.  def labelTyper(ldef: Global.LabelDef): Erasure.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
71.  final def lookupTransformed(tree: Global.Tree): Option[Global.Tree]
    Definition Classes
      Typer
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

    The member with given name of given qualifier type

    Definition Classes
      Typer
74.  def missingSelectErrorTree(tree: Global.Tree, qual: Global.Tree, name: Global.Name): Global.Tree
    Definition Classes
      Typer
75.  def namer: Erasure.Namer
    Definition Classes
      Typer
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?

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

    Definition Classes
      Typer
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
    Definition Classes
      Typer
81.  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
82.  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
83.  def packedTypes(trees: List[Global.Tree]): List[Global.Type]
    Definition Classes
      Typer
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
    Definition Classes
      Typer
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

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

    Is symbol defined and not stale?

    Is symbol defined and not stale?

    Definition Classes
      Typer
88.  def reenterTypeParams(tparams: List[Global.TypeDef]): List[Global.Symbol]
    Definition Classes
      Typer
89.  def reenterValueParams(vparamss: List[List[Global.ValDef]]): Unit
    Definition Classes
      Typer
90.  def reportTypeError(context0: Erasure.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.

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

    Definition Classes
      Typer
94.  def silent[T](op: (Erasure.Typer) => T, reportAmbiguousErrors: Boolean = context.ambiguousErrors, newtree: Global.Tree = context.tree): Erasure.SilentResult[T]
    Definition Classes
      Typer
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
    Definition Classes
      Eraser → Typer
96.  def stabilizeFun(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
    Definition Classes
      Typer
97.  final def synchronized[T0](arg0: => T0): T0
    Definition Classes
      AnyRef
98.  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
99.  def toString(): String
    Definition Classes
      AnyRef → Any
100.  final def transformedOr(tree: Global.Tree, op: => Global.Tree): Global.Tree
     Definition Classes
       Typer
     Annotations
       @inline()
101.  final def transformedOrTyped(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
     Definition Classes
       Typer
     Annotations
       @inline()
102.  val typeAdapter: Erasure.TypeAdapter
103.  final def typed(tree: Global.Tree, mode: Mode): Global.Tree
     Definition Classes
       Typer
     Annotations
       @inline()
104.  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()
105.  final def typed(tree: Global.Tree): Global.Tree

     Types expression or definition `tree`.

     Types expression or definition `tree`.

     Definition Classes
       Typer
     Annotations
       @inline()
106.  def typed(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
     Definition Classes
       Typer
107.  def typed1(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree

     A replacement for the standard typer's `typed1` method.

     A replacement for the standard typer's `typed1` method.

     Definition Classes
       Eraser → Typer
108.  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
109.  def typedArg(arg: Global.Tree, mode: Mode, newmode: Mode, pt: Global.Type): Global.Tree
     Definition Classes
       Typer
110.  def typedArgs(args: List[Global.Tree], mode: Mode): collection.immutable.List[Global.Tree]
     Definition Classes
       Typer
111.  def typedArgsForFormals(args: List[Global.Tree], formals: List[Global.Type], mode: Mode): List[Global.Tree]
     Definition Classes
       PatternTyper
112.  def typedBlock(block0: Global.Block, mode: Mode, pt: Global.Type): Global.Block
     Definition Classes
       Typer
113.  final def typedByValueExpr(tree: Global.Tree, pt: Global.Type = WildcardType): Global.Tree
     Definition Classes
       Typer
     Annotations
       @inline()
114.  def typedCase(cdef: Global.CaseDef, pattpe: Global.Type, pt: Global.Type): Global.CaseDef
     Definition Classes
       Typer
115.  def typedCases(cases: List[Global.CaseDef], pattp: Global.Type, pt: Global.Type): List[Global.CaseDef]
     Definition Classes
       Typer
116.  def typedClassDef(cdef: Global.ClassDef): Global.Tree
     Definition Classes
       Typer
117.  def typedClassOf(tree: Global.Tree, tpt: Global.Tree, noGen: Boolean = false): Global.Tree
     Definition Classes
       Typer
118.  def typedConstructorPattern(fun0: Global.Tree, pt: Global.Type): Global.Tree
     Definition Classes
       PatternTyper
119.  def typedDefDef(ddef: Global.DefDef): Global.DefDef
     Definition Classes
       Typer
120.  def typedDocDef(docDef: Global.DocDef, mode: Mode, pt: Global.Type): Global.Tree
     Definition Classes
       Typer
121.  def typedEtaExpansion(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
     Definition Classes
       Typer
122.  def typedExistentialTypeTree(tree: Global.ExistentialTypeTree, mode: Mode): Global.Tree
     Attributes
       protected
     Definition Classes
       Typer
123.  def typedHigherKindedType(tree: Global.Tree, mode: Mode): Global.Tree
     Definition Classes
       Typer
124.  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
125.  def typedImport(imp: Global.Import): Global.Import
     Definition Classes
       Typer
126.  def typedInPattern(tree: Global.Typed, mode: Mode, pt: Global.Type): Global.Tree
     Attributes
       protected
     Definition Classes
       PatternTyper
127.  def typedLabelDef(ldef: Global.LabelDef): Global.LabelDef
     Definition Classes
       Typer
128.  def typedMacroAnnotation(cdef: Global.ClassDef): Global.ClassDef
     Definition Classes
       Typer
129.  def typedMatch(selector: Global.Tree, cases: List[Global.CaseDef], mode: Mode, pt: Global.Type, tree: Global.Tree = EmptyTree): Global.Match
     Definition Classes
       Typer
130.  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
131.  def typedModuleDef(mdef: Global.ModuleDef): Global.Tree
     Definition Classes
       Typer
132.  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()
133.  final def typedPackageQualifier(tree: Global.Tree): Global.Tree
     Definition Classes
       Typer
     Annotations
       @inline()
134.  def typedParentTypes(templ: Global.Template): List[Global.Tree]
     Definition Classes
       Typer
135.  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
136.  def typedPos(pos: Global.Position)(tree: Global.Tree): Global.Tree
     Definition Classes
       Typer
137.  def typedPos(pos: Global.Position, mode: Mode, pt: Global.Type)(tree: Global.Tree): Global.Tree
     Definition Classes
       Typer
138.  final def typedQualifier(tree: Global.Tree): Global.Tree
     Definition Classes
       Typer
     Annotations
       @inline()
139.  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()
140.  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()
141.  def typedRefinement(templ: Global.Template): Unit
     Definition Classes
       Typer
142.  def typedStarInPattern(tree: Global.Tree, mode: Mode, pt: Global.Type): Global.Tree
     Attributes
       protected
     Definition Classes
       PatternTyper
143.  def typedStats(stats: List[Global.Tree], exprOwner: Global.Symbol): List[Global.Tree]
     Definition Classes
       Typer
144.  def typedTemplate(templ0: Global.Template, parents1: List[Global.Tree]): Global.Template
     Definition Classes
       Typer
145.  def typedType(tree: Global.Tree): Global.Tree

     Types a (fully parameterized) type tree

     Types a (fully parameterized) type tree

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

     Types a (fully parameterized) type tree

     Types a (fully parameterized) type tree

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

### Deprecated Value Members

1.  def formatted(fmtstr: String): String
   Implicit
     This member is added by an implicit conversion from Eraser toStringFormat[Eraser] 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): (Eraser, B)
   Implicit
     This member is added by an implicit conversion from Eraser toArrowAssoc[Eraser] 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 Erasure.Typer

### Inherited from Erasure.TyperContextErrors

### Inherited from Erasure.PatternTyper

### Inherited from Erasure.Tag

### Inherited from Erasure.Adaptation

### Inherited from Erasure.TyperDiagnostics

### Inherited from AnyRef

### Inherited from Any

### Inherited by implicit conversion any2stringadd fromEraser to any2stringadd[Eraser]

### Inherited by implicit conversion StringFormat fromEraser to StringFormat[Eraser]

### Inherited by implicit conversion Ensuring fromEraser to Ensuring[Eraser]

### Inherited by implicit conversion ArrowAssoc fromEraser to ArrowAssoc[Eraser]

### Ungrouped