From fb024546ffd12cda771bb58a762b2ebc824f0299 Mon Sep 17 00:00:00 2001
From: Rapptz <rapptz@gmail.com>
Date: Sat, 24 Apr 2021 08:55:55 -0400
Subject: [PATCH] [commands] Fix Literal converter not working within flags

---
 discord/ext/commands/flags.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/discord/ext/commands/flags.py b/discord/ext/commands/flags.py
index 68a02911d..6bbfb00ba 100644
--- a/discord/ext/commands/flags.py
+++ b/discord/ext/commands/flags.py
@@ -41,6 +41,7 @@ from dataclasses import dataclass, field
 from typing import (
     Dict,
     Iterator,
+    Literal,
     Optional,
     Pattern,
     Set,
@@ -230,6 +231,9 @@ def get_flags(namespace: Dict[str, Any], globals: Dict[str, Any], locals: Dict[s
                     flag.max_args = -1
                 if flag.override is MISSING:
                     flag.override = True
+            elif origin is Literal:
+                if flag.max_args is MISSING:
+                    flag.max_args = 1
             else:
                 raise TypeError(f'Unsupported typing annotation {annotation!r} for {flag.name!r} flag')