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Extras don't get converted to requirements correctly

See original GitHub issue

I’m not sure how to run the latest pipenv git commit (e135f7c) locally (and have terrible internet for the next couple of days), but when I test locking a Pipfile with a path dependencies and extras I get the following error:

Creating a virtualenv for this project…
       Pipfile: /Users/greysteil/code/dependabot-core/tmp/dependabot_20180531-17342-193skc0/Pipfile
       Using /Users/greysteil/.pyenv/versions/3.6.5/bin/python3.6 (3.6.5) to create virtualenv…
       Already using interpreter /Users/greysteil/.pyenv/versions/3.6.5/bin/python3.6
       Using base prefix '/Users/greysteil/.pyenv/versions/3.6.5'
       New python executable in /Users/greysteil/.local/share/virtualenvs/dependabot_20180531-17342-193skc0-bpL9EMBx/bin/python3.6
       Also creating executable in /Users/greysteil/.local/share/virtualenvs/dependabot_20180531-17342-193skc0-bpL9EMBx/bin/python
       Installing setuptools, pip, wheel...done.
       Setting project for dependabot_20180531-17342-193skc0-bpL9EMBx to /Users/greysteil/code/dependabot-core/tmp/dependabot_20180531-17342-193skc0
     
       Virtualenv location: /Users/greysteil/.local/share/virtualenvs/dependabot_20180531-17342-193skc0-bpL9EMBx
       Locking [dev-packages] dependencies…
       Locking [packages] dependencies…
       MBx/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2949, in __init__
           super(Requirement, self).__init__(requirement_string)
         File "/Users/greysteil/.local/share/virtualenvs/dependabot_20180531-17342-193skc0-bpL9EMBx/lib/python3.6/site-packages/pkg_resources/_vendor/packaging/requirements.py", line 94, in __init__
           requirement_string[e.loc:e.loc + 8]))
       pkg_resources.extern.packaging.requirements.InvalidRequirement: Invalid requirement, parse error at "'.[socks]'"
     
       During handling of the above exception, another exception occurred:
     
       Traceback (most recent call last):
         File "/Users/greysteil/code/dependabot-core/helpers/python/src/pipenv/pipenv/resolver.py", line 83, in <module>
           main()
         File "/Users/greysteil/code/dependabot-core/helpers/python/src/pipenv/pipenv/resolver.py", line 72, in main
           system=system,
         File "/Users/greysteil/code/dependabot-core/helpers/python/src/pipenv/pipenv/resolver.py", line 63, in resolve
           allow_global=system,
         File "/Users/greysteil/code/dependabot-core/helpers/python/src/pipenv/pipenv/utils.py", line 401, in resolve_deps
           req_dir=req_dir,
         File "/Users/greysteil/code/dependabot-core/helpers/python/src/pipenv/pipenv/utils.py", line 249, in actually_resolve_reps
           req = Requirement.from_line(dep)
         File "/Users/greysteil/code/dependabot-core/helpers/python/src/pipenv/pipenv/vendor/requirementslib/requirements.py", line 672, in from_line
           r = NamedRequirement.from_line(stripped_line)
         File "/Users/greysteil/code/dependabot-core/helpers/python/src/pipenv/pipenv/vendor/requirementslib/requirements.py", line 246, in from_line
           req = first(requirements.parse(line))
         File "/Users/greysteil/code/dependabot-core/helpers/python/src/pipenv/pipenv/vendor/first.py", line 70, in first
           for el in iterable:
         File "/Users/greysteil/code/dependabot-core/helpers/python/src/pipenv/pipenv/vendor/requirements/parser.py", line 50, in parse
           yield Requirement.parse(line)
         File "/Users/greysteil/code/dependabot-core/helpers/python/src/pipenv/pipenv/vendor/requirements/requirement.py", line 220, in parse
           return cls.parse_line(line)
         File "/Users/greysteil/code/dependabot-core/helpers/python/src/pipenv/pipenv/vendor/requirements/requirement.py", line 198, in parse_line
           pkg_req = Req.parse(line)
         File "/Users/greysteil/.local/share/virtualenvs/dependabot_20180531-17342-193skc0-bpL9EMBx/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2995, in parse
           req, = parse_requirements(s)
         File "/Users/greysteil/.local/share/virtualenvs/dependabot_20180531-17342-193skc0-bpL9EMBx/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2942, in parse_requirements
           yield Requirement(line)
         File "/Users/greysteil/.local/share/virtualenvs/dependabot_20180531-17342-193skc0-bpL9EMBx/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2951, in __init__
           raise RequirementParseError(str(e))
       pkg_resources.RequirementParseError: Invalid requirement, parse error at "'.[socks]'"

To replicate, run pipenv lock with these files:

# Pipfile
[[source]]
url = "https://pypi.python.org/simple"
verify_ssl = true

[dev-packages]
pytest = "==3.4.0"

[packages]
requests = ">=2.18.0"
"e1839a8" = {path = ".", editable = true, extras=["socks"]}

# setup.py
from setuptools import setup, find_packages

setup(name='python-package',
      version='0.0',
      description='Example setup.py',
      url='httos://github.com/example/python-package',
      author='Dependabot',
      scripts=[],
      packages=find_packages(),
      setup_requires=[
          'pytest-runner',
      ],
      install_requires=[
          'raven == 5.32.0',
      ],
      tests_require=[
          'pytest==2.9.1',
          'responses==0.5.1',
      ],
      extras_require=dict(
          API=[
              'flask==0.12.2',
          ],
      ),
)

# Pipfile.lock
{
    "_meta": {
        "hash": {
            "sha256": "1fa9cd2757cc385c836a93a7e9480428b5d00d0f9bddbca159cdff0798c73e05"
        },
        "pipfile-spec": 6,
        "requires": {},
        "sources": [
            {
                "url": "https://pypi.python.org/simple",
                "verify_ssl": true
            }
        ]
    },
    "default": {
        "contextlib2": {
            "hashes": [
                "sha256:509f9419ee91cdd00ba34443217d5ca51f5a364a404e1dce9e8979cea969ca48",
                "sha256:f5260a6e679d2ff42ec91ec5252f4eeffdcf21053db9113bd0a8e4d953769c00"
            ],
            "version": "==0.5.5"
        },
        "e1839a8": {
            "editable": true,
            "extras": [
                "socks"
            ],
            "path": "."
        },
        "raven": {
            "hashes": [
                "sha256:13e68bbf21d4d6f0cae4458da5be2d0d538733beabc5f93cb185048b28a77457",
                "sha256:a06517e9b7858ac41963f9741cc8358005d37511475aaa4c8b692d29ae0a7d94"
            ],
            "version": "==5.32.0"
        },
        "requests": {
            "hashes": [
                "sha256:1cdbed1f0e236f35ef54e919982c7a338e4fea3786310933d3a7887a04b74d75",
                "sha256:fdb9af60d47ca57a80df0a213336019a34ff6192d8fff361c349f2c8398fe460"
            ],
            "version": "==2.6.0"
        }
    },
    "develop": {
        "attrs": {
            "hashes": [
                "sha256:1c7960ccfd6a005cd9f7ba884e6316b5e430a3f1a6c37c5f87d8b43f83b54ec9",
                "sha256:a17a9573a6f475c99b551c0e0a812707ddda1ec9653bed04c13841404ed6f450"
            ],
            "version": "==17.4.0"
        },
        "pluggy": {
            "hashes": [
                "sha256:7f8ae7f5bdf75671a718d2daf0a64b7885f74510bcd98b1a0bb420eb9a9d0cff"
            ],
            "version": "==0.6.0"
        },
        "py": {
            "hashes": [
                "sha256:29c9fab495d7528e80ba1e343b958684f4ace687327e6f789a94bf3d1915f881",
                "sha256:983f77f3331356039fdd792e9220b7b8ee1aa6bd2b25f567a963ff1de5a64f6a"
            ],
            "version": "==1.5.3"
        },
        "pytest": {
            "hashes": [
                "sha256:6074ea3b9c999bd6d0df5fa9d12dd95ccd23550df2a582f5f5b848331d2e82ca",
                "sha256:95fa025cd6deb5d937e04e368a00552332b58cae23f63b76c8c540ff1733ab6d"
            ],
            "version": "==3.4.0"
        },
        "six": {
            "hashes": [
                "sha256:70e8a77beed4562e7f14fe23a786b54f6296e34344c23bc42f07b15018ff98e9",
                "sha256:832dc0e10feb1aa2c68dcc57dbb658f1c7e65b9b61af69048abc87a2db00a0eb"
            ],
            "version": "==1.11.0"
        }
    }
}