AST: Remove unused ProtocolType::visitAllProtocols()

Author: slavapestov

include/swift/AST/Types.h

@@ -5926,16 +5926,6 @@ class ProtocolType : public NominalType {
   /// in the protocol list, then sorting them in some stable order.
   static void canonicalizeProtocols(SmallVectorImpl<ProtocolDecl *> &protocols);
 
-  /// Visit all of the protocols in the given list of protocols, along with their
-  ///
-  /// \param fn Visitor function called for each protocol (just once). If it
-  /// returns \c true, the visit operation will abort and return \c true.
-  ///
-  /// \returns \c true if any invocation of \c fn returns \c true, and \c false
-  /// otherwise.
-  static bool visitAllProtocols(ArrayRef<ProtocolDecl *> protocols,
-                                llvm::function_ref<bool(ProtocolDecl *)> fn);
-
 private:
   friend class NominalTypeDecl;
   ProtocolType(ProtocolDecl *TheDecl, Type Parent, const ASTContext &Ctx,

lib/AST/Type.cpp

@@ -1501,37 +1501,6 @@ static void addProtocols(Type T,
   Superclass = T;
 }
 
-bool ProtocolType::visitAllProtocols(
-                                 ArrayRef<ProtocolDecl *> protocols,
-                                 llvm::function_ref<bool(ProtocolDecl *)> fn) {
-  SmallVector<ProtocolDecl *, 4> stack;
-  SmallPtrSet<ProtocolDecl *, 4> knownProtocols;
-
-  // Prepopulate the stack.
-  for (auto proto : protocols) {
-    if (knownProtocols.insert(proto).second)
-      stack.push_back(proto);
-  }
-  std::reverse(stack.begin(), stack.end());
-
-  while (!stack.empty()) {
-    auto proto = stack.back();
-    stack.pop_back();
-
-    // Visit this protocol.
-    if (fn(proto))
-      return true;
-
-    // Add inherited protocols that we haven't seen already.
-    for (auto inherited : proto->getInheritedProtocols()) {
-      if (knownProtocols.insert(inherited).second)
-        stack.push_back(inherited);
-    }
-  }
-
-  return false;
-}
-
 static void canonicalizeProtocols(SmallVectorImpl<ProtocolDecl *> &protocols,
                                   ParameterizedProtocolMap *parameterized) {
   llvm::SmallDenseMap<ProtocolDecl *, unsigned> known;