dependency conflict with but no conflict listed in graph

[vickeryj]

Issue description

If I have both pytest and pytest-watch in my Pipfile I get a complaint that "Could not find a version that matches pluggy<0.7,>=0.5,>=0.7" when running pipenv install

Expected result

Since the only dependency in the graph is from pytest pluggy [required: >=0.7, installed: 0.7.1] the install should proceed.

Actual result

Could not find a version that matches pluggy<0.7,>=0.5,>=0.7

Joshuas-MacBook-Pro-2:temp vickeryj$ pipenv graph | grep pluggy
    - pluggy [required: >=0.7, installed: 0.7.1]
    - pluggy [required: >=0.7, installed: 0.7.1]

Steps to replicate

Provide the steps to replicate (which usually at least includes the commands and the Pipfile).

Joshuas-MacBook-Pro-2:temp vickeryj$ cat Pipfile
[[source]]
url = "https://pypi.org/simple"
verify_ssl = true
name = "pypi"

[packages]
pytest = "*"
pytest-watch = "*"

[requires]
python_full_version = "3.6.5"

Joshuas-MacBook-Pro-2:temp vickeryj$ pipenv install
Pipfile.lock (cdc0b9) out of date, updating to (94bd57)...
Locking [dev-packages] dependencies...
Locking [packages] dependencies...

Warning: Your dependencies could not be resolved. You likely have a mismatch in your sub-dependencies.
  You can use $ pipenv install --skip-lock to bypass this mechanism, then run $ pipenv graph to inspect the situation.
  Hint: try $ pipenv lock --pre if it is a pre-release dependency.
Could not find a version that matches pluggy<0.7,>=0.5,>=0.7
Tried: 0.3.0, 0.3.0, 0.3.1, 0.3.1, 0.4.0, 0.4.0, 0.5.0, 0.5.1, 0.5.1, 0.5.2, 0.5.2, 0.6.0, 0.6.0, 0.6.0, 0.7.1, 0.7.1
There are incompatible versions in the resolved dependencies.

Joshuas-MacBook-Pro-2:temp vickeryj$  pipenv install --skip-lock
Installing dependencies from Pipfile...
  🐍   ▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉ 2/2 — 00:00:01
To activate this project's virtualenv, run pipenv shell.
Alternatively, run a command inside the virtualenv with pipenv run.
Joshuas-MacBook-Pro-2:temp vickeryj$ pipenv graph
boto3==1.7.67
  - botocore [required: >=1.10.67,<1.11.0, installed: 1.10.67]
    - docutils [required: >=0.10, installed: 0.14]
    - jmespath [required: >=0.7.1,<1.0.0, installed: 0.9.3]
    - python-dateutil [required: >=2.1,<3.0.0, installed: 2.7.3]
      - six [required: >=1.5, installed: 1.11.0]
  - jmespath [required: >=0.7.1,<1.0.0, installed: 0.9.3]
  - s3transfer [required: >=0.1.10,<0.2.0, installed: 0.1.13]
    - botocore [required: >=1.3.0,<2.0.0, installed: 1.10.67]
      - docutils [required: >=0.10, installed: 0.14]
      - jmespath [required: >=0.7.1,<1.0.0, installed: 0.9.3]
      - python-dateutil [required: >=2.1,<3.0.0, installed: 2.7.3]
        - six [required: >=1.5, installed: 1.11.0]
listings-importer-streams==1.0.21
  - marshmallow [required: Any, installed: 2.15.3]
  - marshmallow-enum [required: Any, installed: 1.4.1]
    - marshmallow [required: >=2.0.0, installed: 2.15.3]
  - marshmallow-ext [required: Any, installed: 1.0.6]
    - marshmallow [required: Any, installed: 2.15.3]
  - marshmallow-oneofschema [required: Any, installed: 1.0.5]
    - marshmallow [required: >=2.6.0, installed: 2.15.3]
  - shared-listing-types [required: Any, installed: 1.0.3]
  - typing-extensions [required: Any, installed: 3.6.5]
mypy==0.620
  - typed-ast [required: >=1.1.0,<1.2.0, installed: 1.1.0]
pytest-flake8==1.0.2
  - flake8 [required: >=3.5, installed: 3.5.0]
    - mccabe [required: >=0.6.0,<0.7.0, installed: 0.6.1]
    - pycodestyle [required: >=2.0.0,<2.4.0, installed: 2.3.1]
    - pyflakes [required: >=1.5.0,<1.7.0, installed: 1.6.0]
  - pytest [required: >=3.5, installed: 3.7.0]
    - atomicwrites [required: >=1.0, installed: 1.1.5]
    - attrs [required: >=17.4.0, installed: 18.1.0]
    - more-itertools [required: >=4.0.0, installed: 4.3.0]
      - six [required: >=1.0.0,<2.0.0, installed: 1.11.0]
    - pluggy [required: >=0.7, installed: 0.7.1]
    - py [required: >=1.5.0, installed: 1.5.4]
    - setuptools [required: Any, installed: 40.0.0]
    - six [required: >=1.10.0, installed: 1.11.0]
pytest-watch==4.2.0
  - colorama [required: >=0.3.3, installed: 0.3.9]
  - docopt [required: >=0.4.0, installed: 0.6.2]
  - pytest [required: >=2.6.4, installed: 3.7.0]
    - atomicwrites [required: >=1.0, installed: 1.1.5]
    - attrs [required: >=17.4.0, installed: 18.1.0]
    - more-itertools [required: >=4.0.0, installed: 4.3.0]
      - six [required: >=1.0.0,<2.0.0, installed: 1.11.0]
    - pluggy [required: >=0.7, installed: 0.7.1]
    - py [required: >=1.5.0, installed: 1.5.4]
    - setuptools [required: Any, installed: 40.0.0]
    - six [required: >=1.10.0, installed: 1.11.0]
  - watchdog [required: >=0.6.0, installed: 0.8.3]
    - argh [required: >=0.24.1, installed: 0.26.2]
    - pathtools [required: >=0.1.1, installed: 0.1.2]
    - PyYAML [required: >=3.10, installed: 3.13]

---

Joshuas-MacBook-Pro-2:temp vickeryj$ pipenv --support

$ pipenv --support

Pipenv version: '2018.7.1'

Pipenv location: '/anaconda3/lib/python3.6/site-packages/pipenv'

Python location: '/anaconda3/bin/python'

Other Python installations in PATH:

• 2.7: /usr/bin/python2.7

• 2.7: /usr/bin/python2.7

• 3.6: /anaconda3/bin/python3.6m

• 3.6: /anaconda3/bin/python3.6

• 3.6: /anaconda3/bin/python3.6

• 3.6.5: /anaconda3/bin/python

• 3.6.5: /anaconda3/bin/python

• 2.7.10: /usr/bin/python

• 3.6.5: /anaconda3/bin/python3

• 3.6.5: /anaconda3/bin/python3

PEP 508 Information:

{'implementation_name': 'cpython',
 'implementation_version': '3.6.5',
 'os_name': 'posix',
 'platform_machine': 'x86_64',
 'platform_python_implementation': 'CPython',
 'platform_release': '17.4.0',
 'platform_system': 'Darwin',
 'platform_version': 'Darwin Kernel Version 17.4.0: Sun Dec 17 09:19:54 PST '
                     '2017; root:xnu-4570.41.2~1/RELEASE_X86_64',
 'python_full_version': '3.6.5',
 'python_version': '3.6',
 'sys_platform': 'darwin'}

System environment variables:

• MANPATH
• rvm_bin_path
• TERM_PROGRAM
• GOOGLE_MAPS_KEY
• NVM_CD_FLAGS
• GEM_HOME
• SHELL
• TERM
• IRBRC
• TMPDIR
• Apple_PubSub_Socket_Render
• TERM_PROGRAM_VERSION
• OLDPWD
• MY_RUBY_HOME
• TERM_SESSION_ID
• NVM_DIR
• USER
• _system_type
• rvm_path
• SSH_AUTH_SOCK
• rvm_prefix
• PATH
• NVM_NODEJS_ORG_MIRROR
• PWD
• LANG
• _system_arch
• XPC_FLAGS
• _system_version
• XPC_SERVICE_NAME
• rvm_version
• SHLVL
• HOME
• LOGNAME
• GEM_PATH
• NVM_BIN
• NVM_IOJS_ORG_MIRROR
• GEMFURY_PYPI_AUTH
• RUBY_VERSION
• SECURITYSESSIONID
• _system_name
• TWILIO_AUTH_TOKEN
• _
• PYTHONDONTWRITEBYTECODE
• PIP_PYTHON_PATH

Pipenv–specific environment variables:

Debug–specific environment variables:

• PATH: /anaconda3/bin:/anaconda3/bin:/Users/vickeryj/.nvm/versions/node/v7.1.0/bin:/Users/vickeryj/.rvm/gems/ruby-2.4.1/bin:/Users/vickeryj/.rvm/gems/ruby-2.4.1@global/bin:/Users/vickeryj/.rvm/rubies/ruby-2.4.1/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/vickeryj/bin/apache-maven-3.5.2/bin:/Users/vickeryj/.rvm/bin
• SHELL: /bin/bash
• LANG: en_US.UTF-8
• PWD: /Users/vickeryj/temp

---

Contents of Pipfile ('/Users/vickeryj/temp/Pipfile'):

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

[packages]
pytest = "*"
pytest-watch = "*"

[requires]
python_full_version = "3.6.5"

Contents of Pipfile.lock ('/Users/vickeryj/temp/Pipfile.lock'):

{
    "_meta": {
        "hash": {
            "sha256": "bfff95e191b6fbd30234683538904a0284aee0f1d23cdd63208fe2c466cdc0b9"
        },
        "pipfile-spec": 6,
        "requires": {
            "python_full_version": "3.6.5"
        },
        "sources": [
            {
                "name": "pypi",
                "url": "https://pypi.org/simple",
                "verify_ssl": true
            }
        ]
    },
    "default": {},
    "develop": {
        "atomicwrites": {
            "hashes": [
                "sha256:240831ea22da9ab882b551b31d4225591e5e447a68c5e188db5b89ca1d487585",
                "sha256:a24da68318b08ac9c9c45029f4a10371ab5b20e4226738e150e6e7c571630ae6"
            ],
            "version": "==1.1.5"
        },
        "attrs": {
            "hashes": [
                "sha256:4b90b09eeeb9b88c35bc642cbac057e45a5fd85367b985bd2809c62b7b939265",
                "sha256:e0d0eb91441a3b53dab4d9b743eafc1ac44476296a2053b6ca3af0b139faf87b"
            ],
            "version": "==18.1.0"
        },
        "flake8": {
            "hashes": [
                "sha256:7253265f7abd8b313e3892944044a365e3f4ac3fcdcfb4298f55ee9ddf188ba0",
                "sha256:c7841163e2b576d435799169b78703ad6ac1bbb0f199994fc05f700b2a90ea37"
            ],
            "version": "==3.5.0"
        },
        "mccabe": {
            "hashes": [
                "sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42",
                "sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f"
            ],
            "version": "==0.6.1"
        },
        "more-itertools": {
            "hashes": [
                "sha256:c187a73da93e7a8acc0001572aebc7e3c69daf7bf6881a2cea10650bd4420092",
                "sha256:c476b5d3a34e12d40130bc2f935028b5f636df8f372dc2c1c01dc19681b2039e",
                "sha256:fcbfeaea0be121980e15bc97b3817b5202ca73d0eae185b4550cbfce2a3ebb3d"
            ],
            "version": "==4.3.0"
        },
        "mypy": {
            "hashes": [
                "sha256:673ea75fb750289b7d1da1331c125dc62fc1c3a8db9129bb372ae7b7d5bf300a",
                "sha256:c770605a579fdd4a014e9f0a34b6c7a36ce69b08100ff728e96e27445cef3b3c"
            ],
            "index": "pypi",
            "version": "==0.620"
        },
        "pluggy": {
            "hashes": [
                "sha256:6e3836e39f4d36ae72840833db137f7b7d35105079aee6ec4a62d9f80d594dd1",
                "sha256:95eb8364a4708392bae89035f45341871286a333f749c3141c20573d2b3876e1"
            ],
            "markers": "python_version >= '2.7' and python_version != '3.1.*' and python_version != '3.2.*' and python_version != '3.0.*' and python_version != '3.3.*'",
            "version": "==0.7.1"
        },
        "py": {
            "hashes": [
                "sha256:3fd59af7435864e1a243790d322d763925431213b6b8529c6ca71081ace3bbf7",
                "sha256:e31fb2767eb657cbde86c454f02e99cb846d3cd9d61b318525140214fdc0e98e"
            ],
            "markers": "python_version != '3.1.*' and python_version != '3.3.*' and python_version != '3.2.*' and python_version >= '2.7' and python_version != '3.0.*'",
            "version": "==1.5.4"
        },
        "pycodestyle": {
            "hashes": [
                "sha256:682256a5b318149ca0d2a9185d365d8864a768a28db66a84a2ea946bcc426766",
                "sha256:6c4245ade1edfad79c3446fadfc96b0de2759662dc29d07d80a6f27ad1ca6ba9"
            ],
            "version": "==2.3.1"
        },
        "pyflakes": {
            "hashes": [
                "sha256:08bd6a50edf8cffa9fa09a463063c425ecaaf10d1eb0335a7e8b1401aef89e6f",
                "sha256:8d616a382f243dbf19b54743f280b80198be0bca3a5396f1d2e1fca6223e8805"
            ],
            "version": "==1.6.0"
        },
        "pytest": {
            "hashes": [
                "sha256:8214ab8446104a1d0c17fbd218ec6aac743236c6ffbe23abc038e40213c60b88",
                "sha256:e2b2c6e1560b8f9dc8dd600b0923183fbd68ba3d9bdecde04467be6dd296a384"
            ],
            "index": "pypi",
            "version": "==3.7.0"
        },
        "pytest-flake8": {
            "hashes": [
                "sha256:4f30f5be3efb89755f38f11bdb2a5e22d19a6f5faa73428f703a3292a9572cd3",
                "sha256:c740ad6aa19e3958947d2118f70bed218caf1d2097039fb7318573a2a72f89a1"
            ],
            "index": "pypi",
            "version": "==1.0.2"
        },
        "six": {
            "hashes": [
                "sha256:70e8a77beed4562e7f14fe23a786b54f6296e34344c23bc42f07b15018ff98e9",
                "sha256:832dc0e10feb1aa2c68dcc57dbb658f1c7e65b9b61af69048abc87a2db00a0eb"
            ],
            "version": "==1.11.0"
        },
        "typed-ast": {
            "hashes": [
                "sha256:0948004fa228ae071054f5208840a1e88747a357ec1101c17217bfe99b299d58",
                "sha256:10703d3cec8dcd9eef5a630a04056bbc898abc19bac5691612acba7d1325b66d",
                "sha256:1f6c4bd0bdc0f14246fd41262df7dfc018d65bb05f6e16390b7ea26ca454a291",
                "sha256:25d8feefe27eb0303b73545416b13d108c6067b846b543738a25ff304824ed9a",
                "sha256:29464a177d56e4e055b5f7b629935af7f49c196be47528cc94e0a7bf83fbc2b9",
                "sha256:2e214b72168ea0275efd6c884b114ab42e316de3ffa125b267e732ed2abda892",
                "sha256:3e0d5e48e3a23e9a4d1a9f698e32a542a4a288c871d33ed8df1b092a40f3a0f9",
                "sha256:519425deca5c2b2bdac49f77b2c5625781abbaf9a809d727d3a5596b30bb4ded",
                "sha256:57fe287f0cdd9ceaf69e7b71a2e94a24b5d268b35df251a88fef5cc241bf73aa",
                "sha256:668d0cec391d9aed1c6a388b0d5b97cd22e6073eaa5fbaa6d2946603b4871efe",
                "sha256:68ba70684990f59497680ff90d18e756a47bf4863c604098f10de9716b2c0bdd",
                "sha256:6de012d2b166fe7a4cdf505eee3aaa12192f7ba365beeefaca4ec10e31241a85",
                "sha256:79b91ebe5a28d349b6d0d323023350133e927b4de5b651a8aa2db69c761420c6",
                "sha256:8550177fa5d4c1f09b5e5f524411c44633c80ec69b24e0e98906dd761941ca46",
                "sha256:898f818399cafcdb93cbbe15fc83a33d05f18e29fb498ddc09b0214cdfc7cd51",
                "sha256:94b091dc0f19291adcb279a108f5d38de2430411068b219f41b343c03b28fb1f",
                "sha256:a26863198902cda15ab4503991e8cf1ca874219e0118cbf07c126bce7c4db129",
                "sha256:a8034021801bc0440f2e027c354b4eafd95891b573e12ff0418dec385c76785c",
                "sha256:bc978ac17468fe868ee589c795d06777f75496b1ed576d308002c8a5756fb9ea",
                "sha256:c05b41bc1deade9f90ddc5d988fe506208019ebba9f2578c622516fd201f5863",
                "sha256:c9b060bd1e5a26ab6e8267fd46fc9e02b54eb15fffb16d112d4c7b1c12987559",
                "sha256:edb04bdd45bfd76c8292c4d9654568efaedf76fe78eb246dde69bdb13b2dad87",
                "sha256:f19f2a4f547505fe9072e15f6f4ae714af51b5a681a97f187971f50c283193b6"
            ],
            "version": "==1.1.0"
        }
    }
}

[techalchemy]

Try pipenv lock --clear (see #2684)