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Sometimes you will encounter a bug in Emacs. Although we cannot promise we can or will fix the bug, and we might not even agree that it is a bug, we want to hear about problems you encounter. Often we agree they are bugs and want to fix them.
To make it possible for us to fix a bug, you must report it. In order to do so effectively, you must know when and how to do it.
Before reporting a bug, it is a good idea to see if it is already known. You can find the list of known problems in the file `etc/PROBLEMS' in the Emacs distribution; type C-h P to read it. Some additional user-level problems can be found in section `Bugs and problems' in GNU Emacs FAQ. Looking up your problem in these two documents might provide you with a solution or a work-around, or give you additional information about related issues.
AD.10.1 When Is There a Bug Have you really found a bug? AD.10.2 Understanding Bug Reporting How to report a bug effectively. AD.10.3 Checklist for Bug Reports Steps to follow for a good bug report. AD.10.4 Sending Patches for GNU Emacs How to send a patch for GNU Emacs.