Substitution key not found error with complex factor conditions and references

[pytoxbot]

• Bitbucket: https://bitbucket.org/hpk42/tox/issue/302
• Originally reported by: @jd
• Originally created at: 2016-01-07T17:56:35.382

Consider the following tox.ini file:

#!ini
[tox]
envlist = py27,py34

[testenv]
deps =
  py{27,34}: foo

[testenv:docs]
deps = {[testenv]deps}

Running any tox command raises an error:

tox.ConfigError: ConfigError: substitution key '27,34' not found

[pytoxbot]

Original comment by @hpk42

add changelog entry: fix issue302: allow cross-testenv substitution where we substitute
with {x,y} generative syntax. Thanks Andrew Pashkin.

→ <<cset 581a1b974cd2>>

[pytoxbot]

Original comment by @hpk42

Merged in andrew_pashkin/tox/issue302 (pull request #207)

Make substitution engine ignore factor arrays, fix #302

→ <<cset 9071df77a7fd>>

[pytoxbot]

Original comment by @hpk42

Merged in andrew_pashkin/tox/issue302 (pull request #207)

Make substitution engine ignore factor arrays, fix #302

→ <<cset 9071df77a7fd>>

[pytoxbot]

Original comment by @hpk42

Make substitution engine ignore factor arrays, fix #302

The fix assumes, that the bug was that the substitution engine -
tox.config.Replacer, while recursvely replacing references to actual
values, treated factor arrays (like {py27,py34}) as references, that
are needed to be replaced, which they are not.

The patch simply amends regex which is used by Replacer to recognize
references, to ignore factor arrays. And factor arrays assumed to be
values, enclosed in curly braces, that contain at least one comma.

→ <<cset 66b0272bf19e>>