Simplify templates

tests/parser_test.cpp

@@ -106,14 +106,6 @@ void ErrorTest() {
       "struct-typed fields");
   TestError(
       "struct X (native_type_template: \"Foo\") { Y:int; } "
-      "table T { y:X (native_type_template_arg:\"int\"); }",
-      "does not reference");
-  TestError(
-      "struct X (native_type_template: \"Foo<{{T0}}, {{T1}}>\") { Y:int; } "
-      "table T { y:X (native_type_template_arg:\"int\"); }",
-      "beyond the");
-  TestError(
-      "struct X (native_type_template: \"Foo<{{T}}>\") { Y:int; } "
       "table T { y:X (native_type_template_arg:\"\"); }",
       "empty template argument");
   TestError("{}", "no root");