lib/graphql/language/parser.y in graphql-1.8.0 vs lib/graphql/language/parser.y in graphql-1.8.1

@@ -341,11 +341,11 @@
       INTERFACE name directives_list_opt LCURLY field_definition_list RCURLY {
         return make_node(:InterfaceTypeDefinition, name: val[1], directives: val[2], fields: val[4], description: get_description(val[0]), position_source: val[0])
       }
 
   union_members:
-      name                    { return [make_node(:TypeName, name: val[0])]}
-    | union_members PIPE name { val[0] << make_node(:TypeName, name: val[2]) }
+      name                    { return [make_node(:TypeName, name: val[0], position_source: val[0])]}
+    | union_members PIPE name { val[0] << make_node(:TypeName, name: val[2], position_source: val[2]) }
 
   union_type_definition:
       UNION name directives_list_opt EQUALS union_members {
         return make_node(:UnionTypeDefinition, name: val[1], directives: val[2], types: val[4], description: get_description(val[0]), position_source: val[0])
       }