diff --git a/clang/docs/LibASTMatchersReference.html b/clang/docs/LibASTMatchersReference.html
--- a/clang/docs/LibASTMatchersReference.html
+++ b/clang/docs/LibASTMatchersReference.html
@@ -2790,7 +2790,7 @@
   int *p = 0;
 
 If the matcher is use from clang-query, CastKind parameter
-should be passed as a quoted string. e.g., ofKind("CK_NullToPointer").
+should be passed as a quoted string. e.g., hasCastKind("CK_NullToPointer").
 </pre></td></tr>
 
 
diff --git a/clang/include/clang/ASTMatchers/ASTMatchers.h b/clang/include/clang/ASTMatchers/ASTMatchers.h
--- a/clang/include/clang/ASTMatchers/ASTMatchers.h
+++ b/clang/include/clang/ASTMatchers/ASTMatchers.h
@@ -4913,7 +4913,7 @@
 /// \endcode
 ///
 /// If the matcher is use from clang-query, CastKind parameter
-/// should be passed as a quoted string. e.g., ofKind("CK_NullToPointer").
+/// should be passed as a quoted string. e.g., hasCastKind("CK_NullToPointer").
 AST_MATCHER_P(CastExpr, hasCastKind, CastKind, Kind) {
   return Node.getCastKind() == Kind;
 }
diff --git a/clang/lib/ASTMatchers/Dynamic/Marshallers.h b/clang/lib/ASTMatchers/Dynamic/Marshallers.h
--- a/clang/lib/ASTMatchers/Dynamic/Marshallers.h
+++ b/clang/lib/ASTMatchers/Dynamic/Marshallers.h
@@ -170,7 +170,7 @@
 private:
   static Optional<CastKind> getCastKind(llvm::StringRef AttrKind) {
     return llvm::StringSwitch<Optional<CastKind>>(AttrKind)
-#define CAST_OPERATION(Name) .Case( #Name, CK_##Name)
+#define CAST_OPERATION(Name) .Case("CK_" #Name, CK_##Name)
 #include "clang/AST/OperationKinds.def"
         .Default(llvm::None);
   }
diff --git a/clang/lib/ASTMatchers/Dynamic/Marshallers.cpp b/clang/lib/ASTMatchers/Dynamic/Marshallers.cpp
--- a/clang/lib/ASTMatchers/Dynamic/Marshallers.cpp
+++ b/clang/lib/ASTMatchers/Dynamic/Marshallers.cpp
@@ -75,11 +75,12 @@
 clang::ast_matchers::dynamic::internal::ArgTypeTraits<
     clang::CastKind>::getBestGuess(const VariantValue &Value) {
   static constexpr llvm::StringRef Allowed[] = {
-#define CAST_OPERATION(Name) #Name,
+#define CAST_OPERATION(Name) "CK_" #Name,
 #include "clang/AST/OperationKinds.def"
   };
   if (Value.isString())
-    return ::getBestGuess(Value.getString(), llvm::makeArrayRef(Allowed));
+    return ::getBestGuess(Value.getString(), llvm::makeArrayRef(Allowed),
+                          "CK_");
   return llvm::None;
 }
 
diff --git a/clang/unittests/ASTMatchers/Dynamic/ParserTest.cpp b/clang/unittests/ASTMatchers/Dynamic/ParserTest.cpp
--- a/clang/unittests/ASTMatchers/Dynamic/ParserTest.cpp
+++ b/clang/unittests/ASTMatchers/Dynamic/ParserTest.cpp
@@ -221,6 +221,15 @@
   EXPECT_FALSE(matches("int x = 1 - false;", M));
   EXPECT_FALSE(matches("int x = true - 1;", M));
 
+  Code = "implicitCastExpr(hasCastKind(\"CK_IntegralToBoolean\"))";
+  llvm::Optional<DynTypedMatcher> implicitIntBooleanCast(
+      Parser::parseMatcherExpression(Code, nullptr, nullptr, &Error));
+  EXPECT_EQ("", Error.toStringFull());
+  Matcher<Stmt> MCastStmt =
+      implicitIntBooleanCast->unconditionalConvertTo<Stmt>();
+  EXPECT_TRUE(matches("bool X = 1;", MCastStmt));
+  EXPECT_FALSE(matches("bool X = true;", MCastStmt));
+
   Code = "functionDecl(hasParameter(1, hasName(\"x\")))";
   llvm::Optional<DynTypedMatcher> HasParameter(
       Parser::parseMatcherExpression(Code, &Error));