Merge pull request #9298 from OrangeShark/new-rest-param-error

New rest parameter properties error message

src/compiler/checker.ts

@@ -18204,7 +18204,10 @@ namespace ts {
                 return grammarErrorOnNode(lastDeclare, Diagnostics.A_0_modifier_cannot_be_used_with_an_import_declaration, "declare");
             }
             else if (node.kind === SyntaxKind.Parameter && (flags & NodeFlags.ParameterPropertyModifier) && isBindingPattern((<ParameterDeclaration>node).name)) {
-                return grammarErrorOnNode(node, Diagnostics.A_parameter_property_may_not_be_a_binding_pattern);
+                return grammarErrorOnNode(node, Diagnostics.A_parameter_property_may_not_be_declared_using_a_binding_pattern);
+            }
+            else if (node.kind === SyntaxKind.Parameter && (flags & NodeFlags.ParameterPropertyModifier) && (<ParameterDeclaration>node).dotDotDotToken) {
+                return grammarErrorOnNode(node, Diagnostics.A_parameter_property_cannot_be_declared_using_a_rest_parameter);
             }
             if (flags & NodeFlags.Async) {
                 return checkGrammarAsyncModifier(node, lastAsync);

src/compiler/diagnosticMessages.json

@@ -571,7 +571,7 @@
         "category": "Error",
         "code": 1186
     },
-    "A parameter property may not be a binding pattern.": {
+    "A parameter property may not be declared using a binding pattern.": {
         "category": "Error",
         "code": 1187
     },
@@ -851,6 +851,10 @@
         "category": "Error",
         "code": 1316
     },
+    "A parameter property cannot be declared using a rest parameter.": {
+        "category": "Error",
+        "code": 1317
+    },
     "Duplicate identifier '{0}'.": {
         "category": "Error",
         "code": 2300

src/compiler/parser.ts

@@ -1178,6 +1178,7 @@ namespace ts {
             return token === SyntaxKind.OpenBracketToken
                 || token === SyntaxKind.OpenBraceToken
                 || token === SyntaxKind.AsteriskToken
+                || token === SyntaxKind.DotDotDotToken
                 || isLiteralPropertyName();
         }