scala.reflect.api.Internals

# InternalApi

###
Related Doc: package Internals

#### trait InternalApi extends AnyRef

Reflection API exhibits a tension inherent to experimental things: on the one hand we want it to grow into a beautiful and robust API, but on the other hand we have to deal with immaturity of underlying mechanisms by providing not very pretty solutions to enable important use cases.

In Scala 2.10, which was our first stab at reflection API, we didn't have a systematic approach to dealing with this tension, sometimes exposing too much of internals (e.g. Symbol.deSkolemize) and sometimes exposing too little (e.g. there's still no facility to change owners, to do typing transformations, etc). This resulted in certain confusion with some internal APIs living among public ones, scaring the newcomers, and some internal APIs only available via casting, which requires intimate knowledge of the compiler and breaks compatibility guarantees.

This led to creation of the `internal` API module for the reflection API, which provides advanced APIs necessary for macros that push boundaries of the state of the art, clearly demarcating them from the more or less straightforward rest and providing compatibility guarantees on par with the rest of the reflection API (full compatibility within minor releases, best effort towards backward compatibility within major releases, clear replacement path in case of rare incompatible changes in major releases).

The `internal` module itself (the value that implements InternalApi) isn't defined here, in scala.reflect.api.Universe, but is provided on per-implementation basis. Runtime API endpoint (scala.reflect.runtime.universe) provides `universe.compat: InternalApi`, whereas compile-time API endpoints (instances of scala.reflect.macros.Context) provide `c.compat: ContextInternalApi`, which extends `InternalApi` with additional universe-specific and context-specific functionality.

Self Type
  Universe.InternalApi
Source
  Internals.scala

Linear Supertypes
AnyRef, Any
Known Subclasses
ContextInternalApi, MacroInternalApi
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2. AnyRef
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1. by any2stringadd
2. by StringFormat
3. by Ensuring
4. by ArrowAssoc

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### Type Members

1. #### trait DecoratorApi extends AnyRef

   See also

     Decorators

2. #### abstract type Decorators <: DecoratorApi

   Syntactic conveniences for additional internal APIs for trees, symbols and types

### Abstract Value Members

1. #### abstract def annotatedType(annotations: List[Universe.Annotation], underlying: Universe.Type): Universe.AnnotatedType

   A creator for `AnnotatedType` types.

2. #### abstract def asFreeTerm(symbol: Universe.Symbol): Universe.FreeTermSymbol

   This symbol cast to a free term symbol.

   This symbol cast to a free term symbol.

   Exceptions thrown

     `ScalaReflectionException` if `isFreeTerm` is false.

3. #### abstract def asFreeType(symbol: Universe.Symbol): Universe.FreeTypeSymbol

   This symbol cast to a free type symbol.

   This symbol cast to a free type symbol.

   Exceptions thrown

     `ScalaReflectionException` if `isFreeType` is false.

4. #### abstract def boundedWildcardType(bounds: Universe.TypeBounds): Universe.BoundedWildcardType

   A creator for `BoundedWildcardType` types.

5. #### abstract def classDef(sym: Universe.Symbol, impl: Universe.Template): Universe.ClassDef

   A factory method for `ClassDef` nodes.

6. #### abstract def classInfoType(parents: List[Universe.Type], decls: Universe.Scope, typeSymbol: Universe.Symbol): Universe.ClassInfoType

   A creator for `ClassInfoType` types.

7. #### abstract def constantType(value: Universe.Constant): Universe.ConstantType

   A creator for `ConstantType` types.

8. #### abstract def createImporter(from0: Universe): Universe.Importer { val from: from0.type }

   Creates an importer that moves reflection artifacts between universes.

   Creates an importer that moves reflection artifacts between universes.

   See also

     Importer

9. #### abstract def deSkolemize(symbol: Universe.Symbol): Universe.Symbol

   If this symbol is a skolem, its corresponding type parameter, otherwise the symbol itself.

   If this symbol is a skolem, its corresponding type parameter, otherwise the symbol itself.

   To quote Martin Odersky, skolems are synthetic type "constants" that are copies of existentially bound or universally bound type variables. E.g. if one is inside the right-hand side of a method:

       def foo[T](x: T) = ... foo[List[T]]....

   the skolem named `T` refers to the unknown type instance of `T` when `foo` is called. It needs to be different from the type parameter because in a recursive call as in the `foo[List[T]]` above the type parameter gets substituted with `List[T]`, but the type skolem stays what it is.

   The other form of skolem is an existential skolem. Say one has a function

       def bar(xs: List[T] forSome { type T }) = xs.head

   then each occurrence of `xs` on the right will have type `List[T']` where `T'` is a fresh copy of `T`.

10. #### abstract val decorators: Decorators

    See also

      Decorators

11. #### abstract def defDef(sym: Universe.Symbol, rhs: (List[List[Universe.Symbol]]) ⇒ Universe.Tree): Universe.DefDef

    A factory method for `DefDef` nodes.

12. #### abstract def defDef(sym: Universe.Symbol, rhs: Universe.Tree): Universe.DefDef

    A factory method for `DefDef` nodes.

13. #### abstract def defDef(sym: Universe.Symbol, mods: Universe.Modifiers, rhs: Universe.Tree): Universe.DefDef

    A factory method for `DefDef` nodes.

14. #### abstract def defDef(sym: Universe.Symbol, vparamss: List[List[Universe.ValDef]], rhs: Universe.Tree): Universe.DefDef

    A factory method for `DefDef` nodes.

15. #### abstract def defDef(sym: Universe.Symbol, mods: Universe.Modifiers, vparamss: List[List[Universe.ValDef]], rhs: Universe.Tree): Universe.DefDef

    A factory method for `DefDef` nodes.

16. #### abstract def existentialAbstraction(tparams: List[Universe.Symbol], tpe0: Universe.Type): Universe.Type

    A creator for existential types.

    A creator for existential types. This generates:

        tpe1 where { tparams }

    where `tpe1` is the result of extrapolating `tpe` with regard to `tparams`. Extrapolating means that type variables in `tparams` occurring in covariant positions are replaced by upper bounds, (minus any SingletonClass markers), type variables in `tparams` occurring in contravariant positions are replaced by upper bounds, provided the resulting type is legal with regard to stability, and does not contain any type variable in `tparams`.

    The abstraction drops all type parameters that are not directly or indirectly referenced by type `tpe1`. If there are no remaining type parameters, simply returns result type `tpe`.

17. #### abstract def existentialType(quantified: List[Universe.Symbol], underlying: Universe.Type): Universe.ExistentialType

    A creator for `ExistentialType` types.

18. #### abstract def flags(symbol: Universe.Symbol): Universe.FlagSet

    Returns internal flags associated with the symbol.

19. #### abstract def freeTerms(tree: Universe.Tree): List[Universe.FreeTermSymbol]

    Extracts free term symbols from a tree that is reified or contains reified subtrees.

20. #### abstract def freeTypes(tree: Universe.Tree): List[Universe.FreeTypeSymbol]

    Extracts free type symbols from a tree that is reified or contains reified subtrees.

21. #### abstract def fullyInitialize(scope: Universe.Scope): scope.type

    Calls initialize on all the symbols that the scope consists of.

22. #### abstract def fullyInitialize(tp: Universe.Type): tp.type

    Calls initialize on all the value and type parameters of the type.

23. #### abstract def fullyInitialize(symbol: Universe.Symbol): symbol.type

    Calls initialize on the owner and all the value and type parameters of the symbol.

24. #### abstract def initialize(symbol: Universe.Symbol): symbol.type

    Forces all outstanding completers associated with this symbol.

    Forces all outstanding completers associated with this symbol. After this call returns, the symbol becomes immutable and thread-safe.

25. #### abstract def intersectionType(tps: List[Universe.Type], owner: Universe.Symbol): Universe.Type

    A creator for intersection type where intersections of a single type are replaced by the type itself, and repeated parent classes are merged.

    A creator for intersection type where intersections of a single type are replaced by the type itself, and repeated parent classes are merged.

    !!! Repeated parent classes are not merged - is this a bug in the comment or in the code?

26. #### abstract def intersectionType(tps: List[Universe.Type]): Universe.Type

    A creator for intersection type where intersections of a single type are replaced by the type itself.

27. #### abstract def isErroneous(symbol: Universe.Symbol): Boolean

    Does this symbol or its underlying type represent a typechecking error?

28. #### abstract def isFreeTerm(symbol: Universe.Symbol): Boolean

    Does this symbol represent a free term captured by reification? If yes, `isTerm` is also guaranteed to be true.

29. #### abstract def isFreeType(symbol: Universe.Symbol): Boolean

    Does this symbol represent a free type captured by reification? If yes, `isType` is also guaranteed to be true.

30. #### abstract def isSkolem(symbol: Universe.Symbol): Boolean

    Does this symbol represent the definition of a skolem? Skolems are used during typechecking to represent type parameters viewed from inside their scopes.

31. #### abstract def labelDef(sym: Universe.Symbol, params: List[Universe.Symbol], rhs: Universe.Tree): Universe.LabelDef

    A factory method for `LabelDef` nodes.

32. #### abstract def methodType(params: List[Universe.Symbol], resultType: Universe.Type): Universe.MethodType

    A creator for `MethodType` types.

33. #### abstract def moduleDef(sym: Universe.Symbol, impl: Universe.Template): Universe.ModuleDef

    A factory method for `ModuleDef` nodes.

34. #### abstract def newClassSymbol(owner: Universe.Symbol, name: Universe.TypeName, pos: Universe.Position = NoPosition, flags: Universe.FlagSet = NoFlags): Universe.ClassSymbol

35. #### abstract def newFreeTerm(name: String, value: ⇒ Any, flags: Universe.FlagSet = NoFlags, origin: String = null): Universe.FreeTermSymbol

36. #### abstract def newFreeType(name: String, flags: Universe.FlagSet = NoFlags, origin: String = null): Universe.FreeTypeSymbol

37. #### abstract def newMethodSymbol(owner: Universe.Symbol, name: Universe.TermName, pos: Universe.Position = NoPosition, flags: Universe.FlagSet = NoFlags): Universe.MethodSymbol

38. #### abstract def newModuleAndClassSymbol(owner: Universe.Symbol, name: Universe.Name, pos: Universe.Position = NoPosition, flags: Universe.FlagSet = NoFlags): (Universe.ModuleSymbol, Universe.ClassSymbol)

39. #### abstract def newScopeWith(elems: Universe.Symbol*): Universe.Scope

    Create a new scope with the given initial elements.

40. #### abstract def newTermSymbol(owner: Universe.Symbol, name: Universe.TermName, pos: Universe.Position = NoPosition, flags: Universe.FlagSet = NoFlags): Universe.TermSymbol

41. #### abstract def newTypeSymbol(owner: Universe.Symbol, name: Universe.TypeName, pos: Universe.Position = NoPosition, flags: Universe.FlagSet = NoFlags): Universe.TypeSymbol

42. #### abstract def nullaryMethodType(resultType: Universe.Type): Universe.NullaryMethodType

    A creator for `NullaryMethodType` types.

43. #### abstract def polyType(tparams: List[Universe.Symbol], tpe: Universe.Type): Universe.PolyType

    A creator for type parameterizations that strips empty type parameter lists.

    A creator for type parameterizations that strips empty type parameter lists. Use this factory method to indicate the type has kind * (it's a polymorphic value) until we start tracking explicit kinds equivalent to typeFun (except that the latter requires tparams nonEmpty).

44. #### abstract def refinedType(parents: List[Universe.Type], owner: Universe.Symbol, decls: Universe.Scope, pos: Universe.Position): Universe.Type

    A creator for `RefinedType` types.

45. #### abstract def refinedType(parents: List[Universe.Type], owner: Universe.Symbol, decls: Universe.Scope): Universe.Type

    A creator for `RefinedType` types.

46. #### abstract def refinedType(parents: List[Universe.Type], owner: Universe.Symbol): Universe.Type

    A creator for `RefinedType` types.

47. #### abstract def refinedType(parents: List[Universe.Type], decls: Universe.Scope, clazz: Universe.Symbol): Universe.RefinedType

    A creator for `RefinedType` types.

48. #### abstract def refinedType(parents: List[Universe.Type], decls: Universe.Scope): Universe.RefinedType

    A creator for `RefinedType` types.

49. #### abstract val reificationSupport: Universe.ReificationSupportApi

    This is an internal implementation module.

50. #### abstract def singleType(pre: Universe.Type, sym: Universe.Symbol): Universe.Type

    A creator for `SingleType` types.

51. #### abstract def substituteSymbols(tree: Universe.Tree, from: List[Universe.Symbol], to: List[Universe.Symbol]): Universe.Tree

    Substitute symbols in `to` for corresponding occurrences of references to symbols `from` in this type.

52. #### abstract def substituteThis(tree: Universe.Tree, clazz: Universe.Symbol, to: Universe.Tree): Universe.Tree

    Substitute given tree `to` for occurrences of nodes that represent `C.this`, where `C` referes to the given class `clazz`.

53. #### abstract def substituteTypes(tree: Universe.Tree, from: List[Universe.Symbol], to: List[Universe.Type]): Universe.Tree

    Substitute types in `to` for corresponding occurrences of references to symbols `from` in this tree.

54. #### abstract def superType(thistpe: Universe.Type, supertpe: Universe.Type): Universe.Type

    A creator for `SuperType` types.

55. #### abstract def thisType(sym: Universe.Symbol): Universe.Type

    A creator for `ThisType` types.

56. #### abstract def typeBounds(lo: Universe.Type, hi: Universe.Type): Universe.TypeBounds

    A creator for `TypeBounds` types.

57. #### abstract def typeDef(sym: Universe.Symbol): Universe.TypeDef

    A factory method for `TypeDef` nodes.

58. #### abstract def typeDef(sym: Universe.Symbol, rhs: Universe.Tree): Universe.TypeDef

    A factory method for `TypeDef` nodes.

59. #### abstract def typeRef(pre: Universe.Type, sym: Universe.Symbol, args: List[Universe.Type]): Universe.Type

    A creator for `TypeRef` types.

60. #### abstract def valDef(sym: Universe.Symbol): Universe.ValDef

    A factory method for `ValDef` nodes.

61. #### abstract def valDef(sym: Universe.Symbol, rhs: Universe.Tree): Universe.ValDef

    A factory method for `ValDef` nodes.

### Concrete Value Members

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

   Test two objects for inequality.

   Test two objects for inequality.

   returns

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

   Definition Classes
     AnyRef → Any

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

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

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

   returns

     a hash value consistent with ==

   Definition Classes
     AnyRef → Any

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

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

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

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

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

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

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

   arg0

     the object to compare against this object for equality.

   returns

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

   Definition Classes
     AnyRef → Any

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

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

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

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

   returns

     the receiver object.

   Definition Classes
     Any
   Exceptions thrown

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

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

   Create a copy of the receiver object.

   Create a copy of the receiver object.

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

   returns

     a copy of the receiver object.

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

     not specified by SLS as a member of AnyRef

8. #### def ensuring(cond: (Universe.InternalApi) ⇒ Boolean, msg: ⇒ Any): Universe.InternalApi

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

9. #### def ensuring(cond: (Universe.InternalApi) ⇒ Boolean): Universe.InternalApi

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

10. #### def ensuring(cond: Boolean, msg: ⇒ Any): Universe.InternalApi

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

11. #### def ensuring(cond: Boolean): Universe.InternalApi

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

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

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

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

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

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

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

    returns

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

    Definition Classes
      AnyRef

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

    The equality method for reference types.

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

    See also `equals` in scala.Any.

    returns

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

    Definition Classes
      AnyRef → Any

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

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

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

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

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

      not specified by SLS as a member of AnyRef

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

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

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

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

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

    The nature of the representation is platform dependent.

    returns

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

    Definition Classes
      AnyRef → Any
    Note

      not specified by SLS as a member of AnyRef

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

    The hashCode method for reference types.

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

    returns

      the hash code value for this object.

    Definition Classes
      AnyRef → Any

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

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

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

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

    returns

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

    Definition Classes
      Any

19. #### def manifestToTypeTag[T](mirror: Any, manifest: Manifest[T]): Universe.TypeTag[T]

    Convert a scala.reflect.Manifest to a scala.reflect.api.TypeTags#TypeTag.

    Convert a scala.reflect.Manifest to a scala.reflect.api.TypeTags#TypeTag.

    Compiler usually generates these conversions automatically, when a manifest for a type `T` is in scope, and an implicit of type `TypeTag[T]` is requested, but this method can also be called manually. For example:

        manifestToTypeTag(scala.reflect.runtime.currentMirror, implicitly[Manifest[String]])

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

    Equivalent to `!(this eq that)`.

    Equivalent to `!(this eq that)`.

    returns

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

    Definition Classes
      AnyRef

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

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

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

    Definition Classes
      AnyRef
    Note

      not specified by SLS as a member of AnyRef

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

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

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

    Definition Classes
      AnyRef
    Note

      not specified by SLS as a member of AnyRef

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

    Definition Classes
      AnyRef

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

    Creates a String representation of this object.

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

    returns

      a String representation of the object.

    Definition Classes
      AnyRef → Any

25. #### def typeTagToManifest[T](mirror: Any, tag: Universe.TypeTag[T])(implicit arg0: ClassTag[T]): Manifest[T]

    Convert a scala.reflect.api.TypeTags#TypeTag to a scala.reflect.Manifest.

    Convert a scala.reflect.api.TypeTags#TypeTag to a scala.reflect.Manifest.

    Compiler usually generates these conversions automatically, when a type tag for a type `T` is in scope, and an implicit of type `Manifest[T]` is requested, but this method can also be called manually. For example:

        typeTagToManifest(scala.reflect.runtime.currentMirror, implicitly[TypeTag[String]])

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

29. #### def →[B](y: B): (Universe.InternalApi, B)

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

### Inherited from AnyRef

### Inherited from Any

### Inherited by implicit conversion any2stringadd from Universe.InternalApi to any2stringadd[Universe.InternalApi]

### Inherited by implicit conversion StringFormat from Universe.InternalApi to StringFormat[Universe.InternalApi]

### Inherited by implicit conversion Ensuring from Universe.InternalApi to Ensuring[Universe.InternalApi]

### Inherited by implicit conversion ArrowAssoc from Universe.InternalApi to ArrowAssoc[Universe.InternalApi]

### TagInterop

### TypeCreators

### Ungrouped