New issue 240: Empty "{posargs:foo}" gets replaced by "."
https://bitbucket.org/hpk42/tox/issue/240/empty-posargs-foo-gets-replaced-by
Daniel Hahler:
Given the following tox.ini:
```
#!ini
[tox]
skipsdist = true
[testenv]
commands = echo {posargs:foo}
whitelist_externals = echo
```
Just using `tox` outputs `foo`, but when trying to pass no positional arguments
`.` (a single dot) get passed:
```
% tox -- ""
python runtests: PYTHONHASHSEED='456438988'
python runtests: commands[0] | echo .
.
_____________________________________ summary
______________________________________
python: commands succeeded
congratulations :)
```
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