commit 1b817d0a063dfdbb0ca0e9c870ed411a4f8e9c79
Author: Tom Tromey <tom@tromey.com>
Date:   Tue Jan 17 21:58:09 2017 -0700

    fix typo in mailcap-mime-extensions
    
    * lisp/net/mailcap.el (mailcap-mime-extensions): Use "text/x-patch",
    not "test/x-patch".

diff --git a/lisp/net/mailcap.el b/lisp/net/mailcap.el
index 4e53b5a..89f6c91 100644
--- a/lisp/net/mailcap.el
+++ b/lisp/net/mailcap.el
@@ -853,7 +853,7 @@ mailcap-mime-extensions
     (".css"   . "text/css")
     (".dvi"   . "application/x-dvi")
     (".diff"  . "text/x-patch")
-    (".dpatch". "test/x-patch")
+    (".dpatch". "text/x-patch")
     (".el"    . "application/emacs-lisp")
     (".eps"   . "application/postscript")
     (".etx"   . "text/x-setext")