New issue 191: Generative environments are only created if the fragment is used
https://bitbucket.org/hpk42/tox/issue/191/generative-environments-are-only-created
Hynek Schlawack:
Example:
```init
[tox]
envlist = py27-{a,b}
[testenv]
deps =
b: pytest
commands = true
```
Makes `tox -l` complain: `ERROR: unknown environment 'py27-a'`
My current workaround is to conditionally set some bogus env variable (which
let me run int o #190 :)).
Having unused fragments is useful, I do it for example in
https://github.com/hynek/structlog/blob/master/tox.ini to be more explicit and
save myself listing ‘bare’ environments.
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