Index: clang/include/clang-c/Index.h
===================================================================
--- clang/include/clang-c/Index.h
+++ clang/include/clang-c/Index.h
@@ -4236,7 +4236,7 @@
   CXPrintingPolicy_Indentation,
   CXPrintingPolicy_SuppressSpecifiers,
   CXPrintingPolicy_SuppressTagKeyword,
-  CXPrintingPolicy_IncludeTagDefinition,
+  CXPrintingPolicy_IncludeTagDefinition, ///< deprecated and has no effect
   CXPrintingPolicy_SuppressScope,
   CXPrintingPolicy_SuppressUnwrittenScope,
   CXPrintingPolicy_SuppressInitializers,
Index: clang/include/clang/AST/PrettyPrinter.h
===================================================================
--- clang/include/clang/AST/PrettyPrinter.h
+++ clang/include/clang/AST/PrettyPrinter.h
@@ -93,14 +93,7 @@
   /// \endcode
   unsigned SuppressTagKeyword : 1;
 
-  /// When true, include the body of a tag definition.
-  ///
-  /// This is used to place the definition of a struct
-  /// in the middle of another declaration as with:
-  ///
-  /// \code
-  /// typedef struct { int x, y; } Point;
-  /// \endcode
+  /// This flag is deprecated and no longer has any effect.
   unsigned IncludeTagDefinition : 1;
 
   /// Suppresses printing of scope specifiers.
@@ -225,6 +218,25 @@
   /// When true, print the fully qualified name of function declarations.
   /// This is the opposite of SuppressScope and thus overrules it.
   unsigned FullyQualifiedName : 1;
+
+  /// Transient state that's internal to the printing algorithm and that's not
+  /// intended to be exposed as part of its external configuration (via
+  /// libclang, for example).
+  ///
+  /// FIXME: Many more flags above should be moved here and should be
+  /// deprecated in libclang's CXPrintingPolicyProperty.
+  struct TransientState {
+    TransientState() : PrintOwnedTagDecl(false) {}
+    /// When true, print any tag declaration owned by an elaborated type.
+    ///
+    /// This is used to faithfully print the exact tag declaration that appears
+    /// within another declaration.  For example:
+    ///
+    /// \code
+    /// typedef struct T { int x, y; } Point;
+    /// \endcode
+    unsigned PrintOwnedTagDecl : 1;
+  } State;
 };
 
 } // end namespace clang
Index: clang/lib/AST/DeclPrinter.cpp
===================================================================
--- clang/lib/AST/DeclPrinter.cpp
+++ clang/lib/AST/DeclPrinter.cpp
@@ -178,12 +178,12 @@
   for ( ; Begin != End; ++Begin) {
     if (isFirst) {
       if(TD)
-        SubPolicy.IncludeTagDefinition = true;
+        SubPolicy.State.PrintOwnedTagDecl = true;
       SubPolicy.SuppressSpecifiers = false;
       isFirst = false;
     } else {
       if (!isFirst) Out << ", ";
-      SubPolicy.IncludeTagDefinition = false;
+      SubPolicy.State.PrintOwnedTagDecl = false;
       SubPolicy.SuppressSpecifiers = true;
     }
 
@@ -849,7 +849,7 @@
       }
       PrintingPolicy SubPolicy(Policy);
       SubPolicy.SuppressSpecifiers = false;
-      SubPolicy.IncludeTagDefinition = false;
+      SubPolicy.State.PrintOwnedTagDecl = false;
       Init->printPretty(Out, nullptr, SubPolicy, Indentation);
       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
         Out << ")";
Index: clang/lib/AST/TypePrinter.cpp
===================================================================
--- clang/lib/AST/TypePrinter.cpp
+++ clang/lib/AST/TypePrinter.cpp
@@ -455,7 +455,7 @@
     OS << '(';
 
   PrintingPolicy InnerPolicy(Policy);
-  InnerPolicy.IncludeTagDefinition = false;
+  InnerPolicy.State.PrintOwnedTagDecl = false;
   TypePrinter(InnerPolicy).print(QualType(T->getClass(), 0), OS, StringRef());
 
   OS << "::*";
@@ -1103,9 +1103,9 @@
 }
 
 void TypePrinter::printTag(TagDecl *D, raw_ostream &OS) {
-  if (Policy.IncludeTagDefinition) {
+  if (Policy.State.PrintOwnedTagDecl) {
     PrintingPolicy SubPolicy = Policy;
-    SubPolicy.IncludeTagDefinition = false;
+    SubPolicy.State.PrintOwnedTagDecl = false;
     D->print(OS, SubPolicy, Indentation);
     spaceBeforePlaceHolder(OS);
     return;
@@ -1258,20 +1258,19 @@
 
 void TypePrinter::printElaboratedBefore(const ElaboratedType *T,
                                         raw_ostream &OS) {
-  if (Policy.IncludeTagDefinition && T->getOwnedTagDecl()) {
+  if (Policy.State.PrintOwnedTagDecl && T->getOwnedTagDecl()) {
     TagDecl *OwnedTagDecl = T->getOwnedTagDecl();
     assert(OwnedTagDecl->getTypeForDecl() == T->getNamedType().getTypePtr() &&
            "OwnedTagDecl expected to be a declaration for the type");
     PrintingPolicy SubPolicy = Policy;
-    SubPolicy.IncludeTagDefinition = false;
+    SubPolicy.State.PrintOwnedTagDecl = false;
     OwnedTagDecl->print(OS, SubPolicy, Indentation);
     spaceBeforePlaceHolder(OS);
     return;
   }
 
   // The tag definition will take care of these.
-  if (!Policy.IncludeTagDefinition)
-  {
+  if (!Policy.State.PrintOwnedTagDecl) {
     OS << TypeWithKeyword::getKeywordName(T->getKeyword());
     if (T->getKeyword() != ETK_None)
       OS << " ";
@@ -1286,7 +1285,7 @@
 
 void TypePrinter::printElaboratedAfter(const ElaboratedType *T,
                                         raw_ostream &OS) {
-  if (Policy.IncludeTagDefinition && T->getOwnedTagDecl())
+  if (Policy.State.PrintOwnedTagDecl && T->getOwnedTagDecl())
     return;
   ElaboratedTypePolicyRAII PolicyRAII(Policy);
   printAfter(T->getNamedType(), OS);
Index: clang/tools/c-index-test/c-index-test.c
===================================================================
--- clang/tools/c-index-test/c-index-test.c
+++ clang/tools/c-index-test/c-index-test.c
@@ -103,8 +103,6 @@
        CXPrintingPolicy_SuppressSpecifiers},
       {"CINDEXTEST_PRINTINGPOLICY_SUPPRESSTAGKEYWORD",
        CXPrintingPolicy_SuppressTagKeyword},
-      {"CINDEXTEST_PRINTINGPOLICY_INCLUDETAGDEFINITION",
-       CXPrintingPolicy_IncludeTagDefinition},
       {"CINDEXTEST_PRINTINGPOLICY_SUPPRESSSCOPE",
        CXPrintingPolicy_SuppressScope},
       {"CINDEXTEST_PRINTINGPOLICY_SUPPRESSUNWRITTENSCOPE",