diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index e29bb7499da..e87d3d70a37 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -3357,7 +3357,7 @@ module ts {
                     var sourceProp = getPropertyOfApparentType(<ApparentType>source, targetProp.name);
                     if (sourceProp !== targetProp) {
                         if (!sourceProp) {
-                            if (!isOptionalProperty(targetProp)) {
+                            if (relation ===subtypeRelation || !isOptionalProperty(targetProp)) {
                                 if (reportErrors) {
                                     reportError(Diagnostics.Property_0_is_missing_in_type_1, symbolToString(targetProp), typeToString(source));
                                 }
@@ -3646,10 +3646,6 @@ module ts {
             return forEach(types, t => isSupertypeOfEach(t, types) ? t : undefined);
         }
 
-        function getBestCommonType(types: Type[], contextualType: Type): Type {
-            return contextualType && isSupertypeOfEach(contextualType, types) ? contextualType : getUnionType(types);
-        }
-
         function isTypeOfObjectLiteral(type: Type): boolean {
             return (type.flags & TypeFlags.Anonymous) && type.symbol && (type.symbol.flags & SymbolFlags.ObjectLiteral) ? true : false;
         }
@@ -5736,7 +5732,7 @@ module ts {
                 case SyntaxKind.GreaterThanToken:
                 case SyntaxKind.LessThanEqualsToken:
                 case SyntaxKind.GreaterThanEqualsToken:
-                    if (!isTypeSubtypeOf(leftType, rightType) && !isTypeSubtypeOf(rightType, leftType)) {
+                    if (!isTypeAssignableTo(leftType, rightType) && !isTypeAssignableTo(rightType, leftType)) {
                         reportOperatorError();
                     }
                     return booleanType;
diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
index 57deae0b8f2..4dda5c92ca7 100644
--- a/src/compiler/emitter.ts
+++ b/src/compiler/emitter.ts
@@ -2868,7 +2868,7 @@ module ts {
                         }
                         return {
                             diagnosticMessage: diagnosticMessage,
-                            errorNode: node.parameters[0],
+                            errorNode: <Node>node.parameters[0],
                             typeName: node.name
                         };
                     }
@@ -2889,7 +2889,7 @@ module ts {
                         }
                         return {
                             diagnosticMessage: diagnosticMessage,
-                            errorNode: node.name,
+                            errorNode: <Node>node.name,
                             typeName: undefined
                         };
                     }