AST: Remove TypeBase::getRootOpenedExistentials()

Author: slavapestov

include/swift/AST/Types.h

@@ -770,10 +770,6 @@ class alignas(1 << TypeAlignInBits) TypeBase
   /// Determine whether the type is an opened existential type with Error inside
   bool isOpenedExistentialWithError();
 
-  /// Retrieve the set of root opened archetypes that occur within this type.
-  void getRootOpenedExistentials(
-      SmallVectorImpl<OpenedArchetypeType *> &rootOpenedArchetypes) const;
-
   /// Retrieve the set of type parameter packs that occur within this type.
   void getTypeParameterPacks(SmallVectorImpl<Type> &rootParameterPacks);
 

lib/AST/Type.cpp

@@ -536,25 +536,6 @@ bool TypeBase::hasOpenedExistentialWithRoot(
   });
 }
 
-void TypeBase::getRootOpenedExistentials(
-    SmallVectorImpl<OpenedArchetypeType *> &rootOpenedArchetypes) const {
-  if (!hasOpenedExistential())
-    return;
-
-  SmallPtrSet<OpenedArchetypeType *, 4> known;
-  getCanonicalType().findIf([&](Type type) -> bool {
-    auto *archetype = dyn_cast<OpenedArchetypeType>(type.getPointer());
-    if (!archetype)
-      return false;
-
-    auto *root = archetype->getRoot();
-    if (known.insert(root).second)
-      rootOpenedArchetypes.push_back(root);
-
-    return false;
-  });
-}
-
 Type TypeBase::addCurriedSelfType(const DeclContext *dc) {
   if (!dc->isTypeContext())
     return this;