Am 26.09.2016 um 00:10 schrieb Luc Hermitte (Vim Github Repository):
When an environment variable isn't set, `exists()` return false. We can assign
a value to the variable with `:let`, after which point it exists. But we can't
revert to an non-existent state (related to `unsetenv (3C)`)
```vim
call assert_false(exists('$FOOBAR'))
let $FOOBAR = 1
call assert_true(exists('$FOOBAR'))
unlet $FOOBAR
call assert_false(exists('$FOOBAR'))
```
At least on Windows, assigning the empty string "unlets" it.
--
Andy
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