How to notice when my change breaks something (was: Re: 02/05: gnu: luajit: Update to 2.1.0-beta3.)

[Chris Marusich <cmmarusich@gmail.com>]

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Hi Mark,

How do you notice when a change breaks something else?  You so
frequently notice these things, it almost seems like you're omniscient!

Do you have an automated mechanism for doing this, or are you manually
checking things frequently?  We should all be able to do this, but I
suspect some people (myself included) are not sure how to do it.  If you
could share any tips, that'd be really nice.

Here's an example of what I mean:

Mark H Weaver <mhw@netris.org> writes:

> Hi Tobias,
>
> me@tobias.gr (Tobias Geerinckx-Rice) writes:
>
>> nckx pushed a commit to branch master
>> in repository guix.
>>
>> commit 906f1b48e20a032c22a164c89f9e8862ab2bec7a
>> Author: Tobias Geerinckx-Rice <me@tobias.gr>
>> Date:   Wed Jan 3 09:01:53 2018 +0100
>>
>>     gnu: luajit: Update to 2.1.0-beta3.
>>     
>>     * gnu/packages/lua.scm (luajit): Update to 2.1.0-beta3.
>>     [source]: Remove symlinks patch.
>>     * gnu/packages/patches/luajit-symlinks.patch: Delete file.
>>     * gnu/local.mk (dist_patch_DATA): Remove it.
>
> This seems to have broken the 'love' package, which uses luajit.
>
>   https://hydra.gnu.org/build/2488685
>
> Would you be willing to investigate?
>
>        Mark
>

-- 
Chris

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