extra markers doesn't seem to work

[tyilo]

Issue description

When installing django-constance using pipenv install "django-constance[database]", it will correctly install the dependency django-picklefield.

However when installing in another venv usingpipenv install, django-picklefield is not installed.

Expected result

pipenv install should install django-picklefield.

Actual result

django-picklefield is not installed. Pipenv gives the warning:

Ignoring django-picklefield: markers 'extra == "database"' don't match your environment

Full install output:

$ pipenv install
Creating a virtualenv for this project…
Pipfile: /tmp/test/Pipfile
Using /usr/bin/python3.7 (3.7.0) to create virtualenv…
⠧Running virtualenv with interpreter /usr/bin/python3.7
Using base prefix '/usr'
/home/tyilo/.local/lib/python3.7/site-packages/virtualenv.py:1041: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
  import imp
New python executable in /home/tyilo/.local/share/virtualenvs/test-hxkKlP5o/bin/python3.7
Also creating executable in /home/tyilo/.local/share/virtualenvs/test-hxkKlP5o/bin/python
Installing setuptools, pip, wheel...done.

Virtualenv location: /home/tyilo/.local/share/virtualenvs/test-hxkKlP5o
Installing dependencies from Pipfile.lock (eb14ba)…
Ignoring django-picklefield: markers 'extra == "database"' don't match your environment
  🐍   ▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉ 2/2 — 00:00:00
To activate this project's virtualenv, run pipenv shell.
Alternatively, run a command inside the virtualenv with pipenv run.

Steps to replicate

$ mkdir /tmp/pipenv-markers-test
$ cd mkdir /tmp/pipenv-markers-test
$ pipenv install "django-constance[database]"
...
$ pipenv graph
django-constance==2.3.1
django-picklefield==1.1.0

$ pipenv --rm
$ pipenv install
...
$ pipenv graph
django-constance==2.3.1

---

$ pipenv --support

Pipenv version: '2018.10.13'

Pipenv location: '/home/tyilo/.local/lib/python3.7/site-packages/pipenv'

Python location: '/usr/bin/python'

Python installations found:

• 3.7.0: /usr/bin/python3.7
• 3.7.0: /usr/bin/python3.7m
• 3.5.3: /opt/pypy3/bin/pypy3
• 2.7.15: /usr/bin/python2.7
• 2.7.13: /opt/pypy/bin/pypy

PEP 508 Information:

{'implementation_name': 'cpython',
 'implementation_version': '3.7.0',
 'os_name': 'posix',
 'platform_machine': 'x86_64',
 'platform_python_implementation': 'CPython',
 'platform_release': '4.18.12-arch1-1-ARCH',
 'platform_system': 'Linux',
 'platform_version': '#1 SMP PREEMPT Thu Oct 4 01:01:27 UTC 2018',
 'python_full_version': '3.7.0',
 'python_version': '3.7',
 'sys_platform': 'linux'}

System environment variables:

• COLORTERM
• DBUS_SESSION_BUS_ADDRESS
• DESKTOP_SESSION
• DISPLAY
• EDITOR
• GDMSESSION
• GDM_LANG
• GRADLE_HOME
• GTK_MODULES
• HG
• HOME
• JIF
• LANG
• LC_MEASUREMENT
• LC_PAPER
• LC_TIME
• LOGNAME
• MAIL
• MOZ_PLUGIN_PATH
• PATH
• PWD
• SHELL
• SHLVL
• SMLNJ_HOME
• TERM
• THEOS
• THEOS_DEVICE_IP
• USER
• USERNAME
• VIRTUAL_ENV_DISABLE_PROMPT
• VTE_VERSION
• WINDOWID
• WINDOWPATH
• XAUTHORITY
• XDG_RUNTIME_DIR
• XDG_SEAT
• XDG_SESSION_DESKTOP
• XDG_SESSION_ID
• XDG_SESSION_TYPE
• XDG_VTNR
• PYTHONDONTWRITEBYTECODE
• PIP_SHIMS_BASE_MODULE
• PIP_PYTHON_PATH

Pipenv–specific environment variables:

Debug–specific environment variables:

• PATH: /home/tyilo/bin:/home/tyilo/.local/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/lib/jvm/default/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl:/usr/lib/smlnj/bin
• SHELL: /usr/bin/fish
• EDITOR: vim
• LANG: en_US.UTF-8
• PWD: /tmp/pipenv-markers-test

---

Contents of Pipfile ('/tmp/pipenv-markers-test/Pipfile'):

[[source]]
url = "https://pypi.org/simple"
verify_ssl = true
name = "pypi"

[packages]
django-constance = {extras = ["database"], version = "*"}

[dev-packages]

[requires]
python_version = "3.7"

Contents of Pipfile.lock ('/tmp/pipenv-markers-test/Pipfile.lock'):

{
    "_meta": {
        "hash": {
            "sha256": "09ecd4e5fec12bae5d501662725cd95a611ecff1d255d50ffb3a7919c2eb14ba"
        },
        "pipfile-spec": 6,
        "requires": {
            "python_version": "3.7"
        },
        "sources": [
            {
                "name": "pypi",
                "url": "https://pypi.org/simple",
                "verify_ssl": true
            }
        ]
    },
    "default": {
        "django-constance": {
            "extras": [
                "database"
            ],
            "hashes": [
                "sha256:5a4fec5361214b4658c64184b45a6678cb8f8bf8d342f56976f87d5c6645860a",
                "sha256:a49735063b2c30015d2e52a90609ea9798da722ed070f091de51714758a5d018"
            ],
            "index": "pypi",
            "version": "==2.3.1"
        },
        "django-picklefield": {
            "hashes": [
                "sha256:8d1de6be099044ae61e55998b35de18a57499b946fe45781077f5cec4f73f0e0",
                "sha256:ce7fee5c6558fe5dc8924993d994ccde75bb75b91cd82787cbd4c92b95a69f9c"
            ],
            "markers": "extra == 'database'",
            "version": "==1.1.0"
        }
    },
    "develop": {}
}

[frostming]

Replicated here, either 'extra' marker should be ignored when installing, or it shouldn't be produced by resolver.

[techalchemy]

See also: #3026 #3039