Merge pull request #1032 from Microsoft/checkTypeAliasName

Type alias cannot have reserved type name (#1030)

Author: ahejlsberg

src/compiler/checker.ts

@@ -7697,6 +7697,7 @@ module ts {
         }
 
         function checkTypeAliasDeclaration(node: TypeAliasDeclaration) {
+            checkTypeNameIsReserved(node.name, Diagnostics.Type_alias_name_cannot_be_0);
             checkSourceElement(node.type);
         }
 

src/compiler/diagnosticInformationMap.generated.ts

@@ -269,6 +269,7 @@ module ts {
         The_type_argument_for_type_parameter_0_cannot_be_inferred_from_the_usage_Consider_specifying_the_type_arguments_explicitly: { code: 2453, category: DiagnosticCategory.Error, key: "The type argument for type parameter '{0}' cannot be inferred from the usage. Consider specifying the type arguments explicitly." },
         Type_argument_candidate_1_is_not_a_valid_type_argument_because_it_is_not_a_supertype_of_candidate_0: { code: 2455, category: DiagnosticCategory.Error, key: "Type argument candidate '{1}' is not a valid type argument because it is not a supertype of candidate '{0}'." },
         Type_alias_0_circularly_references_itself: { code: 2456, category: DiagnosticCategory.Error, key: "Type alias '{0}' circularly references itself." },
+        Type_alias_name_cannot_be_0: { code: 2457, category: DiagnosticCategory.Error, key: "Type alias name cannot be '{0}'" },
         Import_declaration_0_is_using_private_name_1: { code: 4000, category: DiagnosticCategory.Error, key: "Import declaration '{0}' is using private name '{1}'." },
         Type_parameter_0_of_exported_class_has_or_is_using_name_1_from_private_module_2: { code: 4001, category: DiagnosticCategory.Error, key: "Type parameter '{0}' of exported class has or is using name '{1}' from private module '{2}'." },
         Type_parameter_0_of_exported_class_has_or_is_using_private_name_1: { code: 4002, category: DiagnosticCategory.Error, key: "Type parameter '{0}' of exported class has or is using private name '{1}'." },

src/compiler/diagnosticMessages.json

@@ -1076,6 +1076,10 @@
         "category": "Error",
         "code": 2456
     },
+    "Type alias name cannot be '{0}'": {
+        "category": "Error",
+        "code": 2457
+    },
 
     "Import declaration '{0}' is using private name '{1}'.": {
         "category": "Error",