Add error highlighting for duplicate variables/constants

modules/gdscript/gdscript_parser.cpp

@@ -1535,7 +1535,7 @@ GDScriptParser::SuiteNode *GDScriptParser::parse_suite(const String &p_context,
 				VariableNode *variable = static_cast<VariableNode *>(statement);
 				const SuiteNode::Local &local = current_suite->get_local(variable->identifier->name);
 				if (local.type != SuiteNode::Local::UNDEFINED) {
-					push_error(vformat(R"(There is already a %s named "%s" declared in this scope.)", local.get_name(), variable->identifier->name));
+					push_error(vformat(R"(There is already a %s named "%s" declared in this scope.)", local.get_name(), variable->identifier->name), variable->identifier);
 				}
 				current_suite->add_local(variable, current_function);
 				break;
@@ -1550,7 +1550,7 @@ GDScriptParser::SuiteNode *GDScriptParser::parse_suite(const String &p_context,
 					} else {
 						name = "variable";
 					}
-					push_error(vformat(R"(There is already a %s named "%s" declared in this scope.)", name, constant->identifier->name));
+					push_error(vformat(R"(There is already a %s named "%s" declared in this scope.)", name, constant->identifier->name), constant->identifier);
 				}
 				current_suite->add_local(constant, current_function);
 				break;