From 52e12d9ef6885692c9c89bb0bf7510daf4f7c5b3 Mon Sep 17 00:00:00 2001
From: David Smith <smithdc@gmail.com>
Date: Wed, 9 Sep 2020 22:01:26 +0100
Subject: [PATCH] Return NotImplemented sooner for ErrorDetail equality test

The test suite raises warnings when tested against Python 3.9
`DeprecationWarning: NotImplemented should not be used in a boolean context`

Where `r` returns `NotImplemented` then this change returns `NotImplemented` first to avoid the comparison test.
---
 rest_framework/exceptions.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/rest_framework/exceptions.py b/rest_framework/exceptions.py
index 345a405248..943dcc88c3 100644
--- a/rest_framework/exceptions.py
+++ b/rest_framework/exceptions.py
@@ -73,6 +73,8 @@ def __new__(cls, string, code=None):
 
     def __eq__(self, other):
         r = super().__eq__(other)
+        if r is NotImplemented:
+            return NotImplemented
         try:
             return r and self.code == other.code
         except AttributeError: