Disallow binding patterns in parameter properties.

src/compiler/checker.ts

@@ -10172,6 +10172,9 @@ module ts {
             else if (node.kind === SyntaxKind.InterfaceDeclaration && flags & NodeFlags.Ambient) {
                 return grammarErrorOnNode(lastDeclare, Diagnostics.A_declare_modifier_cannot_be_used_with_an_interface_declaration, "declare");
             }
+            else if (node.kind === SyntaxKind.Parameter && (flags & NodeFlags.AccessibilityModifier) && isBindingPattern((<ParameterDeclaration>node).name)) {
+                return grammarErrorOnNode(node, Diagnostics.A_parameter_property_may_not_be_a_binding_pattern);
+            }
         }
 
         function checkGrammarForDisallowedTrailingComma(list: NodeArray<Node>): boolean {

src/compiler/diagnosticInformationMap.generated.ts

@@ -146,6 +146,7 @@ module ts {
         Modifiers_cannot_appear_here: { code: 1184, category: DiagnosticCategory.Error, key: "Modifiers cannot appear here." },
         Merge_conflict_marker_encountered: { code: 1185, category: DiagnosticCategory.Error, key: "Merge conflict marker encountered." },
         A_rest_element_cannot_have_an_initializer: { code: 1186, category: DiagnosticCategory.Error, key: "A rest element cannot have an initializer." },
+        A_parameter_property_may_not_be_a_binding_pattern: { code: 1187, category: DiagnosticCategory.Error, key: "A parameter property may not be a binding pattern." },
         Duplicate_identifier_0: { code: 2300, category: DiagnosticCategory.Error, key: "Duplicate identifier '{0}'." },
         Initializer_of_instance_member_variable_0_cannot_reference_identifier_1_declared_in_the_constructor: { code: 2301, category: DiagnosticCategory.Error, key: "Initializer of instance member variable '{0}' cannot reference identifier '{1}' declared in the constructor." },
         Static_members_cannot_reference_class_type_parameters: { code: 2302, category: DiagnosticCategory.Error, key: "Static members cannot reference class type parameters." },

src/compiler/diagnosticMessages.json

@@ -224,7 +224,7 @@
     "A 'declare' modifier cannot be used with an import declaration.": {
         "category": "Error",
         "code": 1079,
-        "isEarly":  true
+        "isEarly": true
     },
     "Invalid 'reference' directive syntax.": {
         "category": "Error",
@@ -659,7 +659,7 @@
     "An implementation cannot be declared in ambient contexts.": {
         "category": "Error",
         "code": 1184,
-        "isEarly":  true
+        "isEarly": true
     },
     "Modifiers cannot appear here.": {
         "category": "Error",
@@ -673,6 +673,10 @@
         "category": "Error",
         "code": 1186
     },
+    "A parameter property may not be a binding pattern.": {
+        "category": "Error",
+        "code":  1187
+    },
 
     "Duplicate identifier '{0}'.": {
         "category": "Error",