If I do
vim -u NONE -c 'unlet $PATH'
I get “E488: Trailing characters” error.
That means that there is no way to get rid of environment variable after it was
set which may be essential if tools using variables check for their existence,
not for their contents (e.g. in tcsh scripts checking for emptyness and for
existence are different constructs and they are rarely checked both (and
non-existent variables expand to errors, not to empty values), it is also not
uncommon to write “if 'VARNAME' in os.environ:” or use EAFP principle in python
in which cases empty string is treated just like any other value).
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