diff --git a/codan/org.eclipse.cdt.codan.checkers/src/org/eclipse/cdt/codan/internal/checkers/ProblemBindingChecker.java b/codan/org.eclipse.cdt.codan.checkers/src/org/eclipse/cdt/codan/internal/checkers/ProblemBindingChecker.java
index 75e2ecba211..a309e728b51 100644
--- a/codan/org.eclipse.cdt.codan.checkers/src/org/eclipse/cdt/codan/internal/checkers/ProblemBindingChecker.java
+++ b/codan/org.eclipse.cdt.codan.checkers/src/org/eclipse/cdt/codan/internal/checkers/ProblemBindingChecker.java
@@ -35,6 +35,7 @@ import org.eclipse.cdt.core.dom.ast.IBinding;
 import org.eclipse.cdt.core.dom.ast.IFunctionType;
 import org.eclipse.cdt.core.dom.ast.IProblemBinding;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTDeclarator;
+import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTLiteralExpression;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTQualifiedName;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTTemplateId;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPClassType;
@@ -245,6 +246,9 @@ public class ProblemBindingChecker extends AbstractIndexAstChecker {
 			}
 		} else if (parentNode instanceof ICPPASTDeclarator && name instanceof IASTImplicitName) {
 			return true;
+		} else if (parentNode instanceof ICPPASTLiteralExpression && name instanceof IASTImplicitName) {
+			// Implicit name for user-defined literal operator.
+			return true;
 		}
 		return false;
 	}
diff --git a/codan/org.eclipse.cdt.codan.core.test/src/org/eclipse/cdt/codan/core/internal/checkers/ProblemBindingCheckerTest.java b/codan/org.eclipse.cdt.codan.core.test/src/org/eclipse/cdt/codan/core/internal/checkers/ProblemBindingCheckerTest.java
index 3e250a259cd..67cbccdadae 100644
--- a/codan/org.eclipse.cdt.codan.core.test/src/org/eclipse/cdt/codan/core/internal/checkers/ProblemBindingCheckerTest.java
+++ b/codan/org.eclipse.cdt.codan.core.test/src/org/eclipse/cdt/codan/core/internal/checkers/ProblemBindingCheckerTest.java
@@ -95,4 +95,18 @@ public class ProblemBindingCheckerTest extends CheckerTestCase {
 		IMarker marker = checkErrorLine(3, ProblemBindingChecker.ERR_ID_FunctionResolutionProblem);
 		assertFalse(marker.getAttribute(IMarker.MESSAGE, "").contains("MACRO"));  //$NON-NLS-1$//$NON-NLS-2$
 	}
+
+	//	auto d = 42_waldo;
+	public void testNonexistentUDLOperator_484619() {
+		loadCodeAndRun(getAboveComment());
+		checkErrorLine(1, ProblemBindingChecker.ERR_ID_FunctionResolutionProblem);
+	}
+
+	//	struct R {};
+	//	R operator "" _waldo(const char*, unsigned long);  // expects a string literal
+	//	auto d = 42_waldo;                                 // passing an integer
+	public void testUDLOperatorWithWrongType_484619() {
+		loadCodeAndRun(getAboveComment());
+		checkErrorLine(3, ProblemBindingChecker.ERR_ID_InvalidArguments);
+	}
 }
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPSemantics.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPSemantics.java
index 5a14ad8c180..cb670ee54ff 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPSemantics.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPSemantics.java
@@ -3137,7 +3137,7 @@ public class CPPSemantics {
 		
 		if (funcs.length == 0) {
 			// S shall not be empty
-			return new ProblemBinding(data.getLookupName(), exp, IProblemBinding.SEMANTIC_INVALID_TYPE);
+			return new ProblemBinding(data.getLookupName(), exp, IProblemBinding.SEMANTIC_NAME_NOT_FOUND);
 		}
 		
 		if (kind == IASTLiteralExpression.lk_integer_constant || kind == IASTLiteralExpression.lk_float_constant) {
@@ -3209,7 +3209,7 @@ public class CPPSemantics {
 			}
 			else if (ret == null) {
 				// Couldn't find a valid operator
-				return new ProblemBinding(data.getLookupName(), exp, IProblemBinding.SEMANTIC_INVALID_TYPE);
+				return new ProblemBinding(data.getLookupName(), exp, IProblemBinding.SEMANTIC_INVALID_OVERLOAD);
 			}
 		} else if (kind == IASTLiteralExpression.lk_string_literal) {
 			/*