From 40b53bc29a10bb0f53266b0631dcfa9f0fb6de3f Mon Sep 17 00:00:00 2001
From: Thakee Nathees <thakeenathees@gmail.com>
Date: Sun, 1 Mar 2020 20:39:17 +0530
Subject: [PATCH] duplicate arguments in a function handled

(cherry picked from commit 5424b626f96c0fb9e00610036236e3e6c67eda55)
---
 modules/gdscript/gdscript_parser.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/modules/gdscript/gdscript_parser.cpp b/modules/gdscript/gdscript_parser.cpp
index d125da5b79f..44d0cb01059 100644
--- a/modules/gdscript/gdscript_parser.cpp
+++ b/modules/gdscript/gdscript_parser.cpp
@@ -3809,6 +3809,12 @@ void GDScriptParser::_parse_class(ClassNode *p_class) {
 						}
 
 						StringName argname = tokenizer->get_token_identifier();
+						for (int i = 0; i < arguments.size(); i++) {
+							if (arguments[i] == argname) {
+								_set_error("The argument name \"" + String(argname) + "\" is defined multiple times.");
+								return;
+							}
+						}
 						arguments.push_back(argname);
 #ifdef DEBUG_ENABLED
 						arguments_usage.push_back(0);