From 227955cbe8ff70b61ae2e8d04f64a77255513de6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fran=C3=A7ois=20Freitag?= <mail@franek.fr>
Date: Wed, 27 Jan 2021 17:11:41 +0100
Subject: [PATCH] linkcheck: Raise on unknown status in process_result()

Helps catching programming errors. The else clause should never be
reached.
---
 sphinx/builders/linkcheck.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sphinx/builders/linkcheck.py b/sphinx/builders/linkcheck.py
index 106303bd6..9a5ca6041 100644
--- a/sphinx/builders/linkcheck.py
+++ b/sphinx/builders/linkcheck.py
@@ -428,6 +428,8 @@ class CheckExternalLinksBuilder(DummyBuilder):
             self.write_entry('redirected ' + text, docname, filename,
                              lineno, uri + ' to ' + info)
             self.write_linkstat(linkstat)
+        else:
+            raise ValueError("Unknown status %s." % status)
 
     def write_entry(self, what: str, docname: str, filename: str, line: int,
                     uri: str) -> None: