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bug#23779: 25.0.95; consing "SHELLVAR" onto process-environment doesn't

From: Dmitry Gutov
Subject: bug#23779: 25.0.95; consing "SHELLVAR" onto process-environment doesn't remove it from subprocess env
Date: Fri, 17 Jun 2016 15:17:38 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2

On 06/17/2016 10:11 AM, Eli Zaretskii wrote:

Where does it say that you can use 'cons' or 'push', and only them, to
the effect of removing the variable from the environment passed to
child processes?

That works with other Emacs features, such as auto-mode-alist.

You can also override the values in process-environment using a cons (which strongly suggests the semantics of "first element wins"). Just not "remove" them, currently.

process-environment is just a simple list, so these
two functions just _add_ another member to the list, they don't remove
the old member.

What would be the point of ever using the "only its name" form if you have to scrub process-environment of all other mentions of this variable?

My reading of the last sentence you cite is that you must manually
remove the old member "SHELL=whatever", and _then_ add a member that
has no value.

If I've removed all mentions of "GIT_DIR" in there, it's already removed, and the subprocesses shouldn't see it. Why add the new member then?

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