Index: include/clang-c/Index.h
===================================================================
--- include/clang-c/Index.h
+++ include/clang-c/Index.h
@@ -32,7 +32,7 @@
  * compatible, thus CINDEX_VERSION_MAJOR is expected to remain stable.
  */
 #define CINDEX_VERSION_MAJOR 0
-#define CINDEX_VERSION_MINOR 43
+#define CINDEX_VERSION_MINOR 44
 
 #define CINDEX_VERSION_ENCODE(major, minor) ( \
       ((major) * 10000)                       \
@@ -2616,6 +2616,16 @@
  */
 CINDEX_LINKAGE unsigned clang_isDeclaration(enum CXCursorKind);
 
+/**
+ * \brief Determine whether the given declaration is invalid.
+ *
+ * A declaration is invalid if it could not be parsed successfully.
+ *
+ * \returns non-zero if the cursor represents a declaration and it is
+ * invalid, otherwise NULL.
+ */
+CINDEX_LINKAGE unsigned clang_isInvalidDeclaration(CXCursor);
+
 /**
  * \brief Determine whether the given cursor kind represents a simple
  * reference.
Index: test/Index/print-type-size.cpp
===================================================================
--- test/Index/print-type-size.cpp
+++ test/Index/print-type-size.cpp
@@ -4,8 +4,8 @@
 
 namespace basic {
 
-// CHECK64: VarDecl=v:[[@LINE+2]]:6 (Definition) [type=void] [typekind=Void]
-// CHECK32: VarDecl=v:[[@LINE+1]]:6 (Definition) [type=void] [typekind=Void]
+// CHECK64: VarDecl=v:[[@LINE+2]]:6 (Definition) (invalid) [type=void] [typekind=Void]
+// CHECK32: VarDecl=v:[[@LINE+1]]:6 (Definition) (invalid) [type=void] [typekind=Void]
 void v;
 
 // CHECK64: VarDecl=v1:[[@LINE+2]]:7 (Definition) [type=void *] [typekind=Pointer] [sizeof=8] [alignof=8]
Index: tools/c-index-test/c-index-test.c
===================================================================
--- tools/c-index-test/c-index-test.c
+++ tools/c-index-test/c-index-test.c
@@ -810,6 +810,8 @@
       printf(" (variadic)");
     if (clang_Cursor_isObjCOptional(Cursor))
       printf(" (@optional)");
+    if (clang_isInvalidDeclaration(Cursor))
+      printf(" (invalid)");
 
     switch (clang_getCursorExceptionSpecificationType(Cursor))
     {
Index: tools/libclang/CIndex.cpp
===================================================================
--- tools/libclang/CIndex.cpp
+++ tools/libclang/CIndex.cpp
@@ -5379,6 +5379,15 @@
          (K >= CXCursor_FirstExtraDecl && K <= CXCursor_LastExtraDecl);
 }
 
+unsigned clang_isInvalidDeclaration(CXCursor C) {
+  if (clang_isDeclaration(C.kind)) {
+    if (const Decl *D = getCursorDecl(C))
+      return D->isInvalidDecl();
+  }
+
+  return 0;
+}
+
 unsigned clang_isReference(enum CXCursorKind K) {
   return K >= CXCursor_FirstRef && K <= CXCursor_LastRef;
 }
Index: tools/libclang/libclang.exports
===================================================================
--- tools/libclang/libclang.exports
+++ tools/libclang/libclang.exports
@@ -288,6 +288,7 @@
 clang_isConstQualifiedType
 clang_isCursorDefinition
 clang_isDeclaration
+clang_isInvalidDeclaration
 clang_isExpression
 clang_isFileMultipleIncludeGuarded
 clang_isFunctionTypeVariadic