From acc0952ff841941fa289a759414af20c04810311 Mon Sep 17 00:00:00 2001
From: =?utf8?q?=C3=89ric=20Araujo?= <merwok@netwok.org>
Date: Mon, 14 Nov 2011 19:45:30 +0100
Subject: [PATCH] The error message should contain the key as given, not
 normalized.

Backout of 2e047702df7f.  Reported by Jeremy Kloth.
---
 Lib/packaging/metadata.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Lib/packaging/metadata.py b/Lib/packaging/metadata.py
index 2d0ffa49b1..2993ebbe71 100644
--- a/Lib/packaging/metadata.py
+++ b/Lib/packaging/metadata.py
@@ -229,8 +229,10 @@ class Metadata:
 
     def __delitem__(self, name):
         field_name = self._convert_name(name)
-        # we let a KeyError propagate
-        del self._fields[field_name]
+        try:
+            del self._fields[field_name]
+        except KeyError:
+            raise KeyError(name)
         self._set_best_version()
 
     def __contains__(self, name):
-- 
2.50.1