Disallowing field name same as table name.

Change-Id: I4b5d822cc4eda975949d1b7cf33674c5bbf9d4b1
Tested: on Linux.

src/idl_parser.cpp

@@ -601,6 +601,10 @@ CheckedError Parser::AddField(StructDef &struct_def, const std::string &name,
 
 CheckedError Parser::ParseField(StructDef &struct_def) {
   std::string name = attribute_;
+
+  if (name == struct_def.name)
+    return Error("field name can not be the same as table/struct name");
+
   std::vector<std::string> dc = doc_comment_;
   EXPECT(kTokenIdentifier);
   EXPECT(':');

tests/test.cpp

@@ -1038,6 +1038,7 @@ void ErrorTest() {
   TestError("table X { Y:[[int]]; }", "nested vector");
   TestError("table X { Y:1; }", "illegal type");
   TestError("table X { Y:int; Y:int; }", "field already");
+  TestError("table X { X:int; }", "same as table");
   TestError("struct X { Y:string; }", "only scalar");
   TestError("struct X { Y:int (deprecated); }", "deprecate");
   TestError("union Z { X } table X { Y:Z; } root_type X; { Y: {}, A:1 }",