pipenv install via git subdirectory not working, though pip install does

Using pipenv to install a dep via a git repo subdirectory is failing.

### Steps to replicate

The following works fine in a virtualenv:
```bash
pip install "git+https://github.com/google/neuroglancer.git#subdirectory=python&egg=neuroglancer"
```

But the pipenv version does not work properly, though the Pipfile seems right to me.
```bash
$ pipenv install "git+https://github.com/google/neuroglancer.git#subdirectory=python&egg=neuroglancer"
Creating a Pipfile for this project…
Installing git+https://github.com/google/neuroglancer.git#subdirectory=python&egg=neuroglancer…
Adding neuroglancer to Pipfile's [packages]…
✔ Installation Succeeded 
Pipfile.lock not found, creating…
Locking [dev-packages] dependencies…
Locking [packages] dependencies…
Building requirements...
Resolving dependencies...
✘ Locking Failed! 
Traceback (most recent call last):
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/resolver.py", line 807, in <module>
    main()
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/resolver.py", line 803, in main
    parsed.requirements_dir, parsed.packages, parse_only=parsed.parse_only)
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/resolver.py", line 785, in _main
    resolve_packages(pre, clear, verbose, system, write, requirements_dir, packages)
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/resolver.py", line 753, in resolve_packages
    requirements_dir=requirements_dir,
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/resolver.py", line 736, in resolve
    req_dir=requirements_dir
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/utils.py", line 1386, in resolve_deps
    req_dir=req_dir,
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/utils.py", line 1091, in actually_resolve_deps
    deps, index_lookup, markers_lookup, project, sources, req_dir, clear, pre
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/utils.py", line 649, in create
    pre=pre, clear=clear
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/utils.py", line 463, in get_metadata
    req, resolver=transient_resolver
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/utils.py", line 540, in get_deps_from_req
    req_list, lockfile = get_vcs_deps(reqs=[req])
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/utils.py", line 1874, in get_vcs_deps
    with temp_path(), locked_repository(requirement) as repo:
  File "/usr/lib/python3.7/contextlib.py", line 112, in __enter__
    return next(self.gen)
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/utils.py", line 2031, in locked_repository
    with requirement.req.locked_vcs_repo(src_dir=src_dir) as repo:
  File "/usr/lib/python3.7/contextlib.py", line 112, in __enter__
    return next(self.gen)
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/vendor/requirementslib/models/requirements.py", line 2212, in locked_vcs_repo
    self._parsed_line.vcsrepo = vcsrepo
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/vendor/requirementslib/models/requirements.py", line 916, in vcsrepo
    kwargs=wheel_kwargs,
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/vendor/requirementslib/models/setup_info.py", line 1918, in create
    created.get_initial_info()
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/vendor/requirementslib/models/setup_info.py", line 1747, in get_initial_info
    self.update_from_dict(self.parse_setup_py())
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/vendor/requirementslib/models/setup_info.py", line 1504, in parse_setup_py
    parsed = ast_parse_setup_py(self.setup_py.as_posix())
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/vendor/requirementslib/models/setup_info.py", line 1201, in ast_parse_setup_py
    ast_analyzer.unmap_binops()
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/vendor/requirementslib/models/setup_info.py", line 729, in unmap_binops
    self.binOps_map[binop] = ast_unparse(binop, analyzer=self)
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/vendor/requirementslib/models/setup_info.py", line 1016, in ast_unparse
    right_item = unparse(item.right)
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/vendor/requirementslib/models/setup_info.py", line 1040, in ast_unparse
    items = unparse(analyzer.assignments[assignment])
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/vendor/requirementslib/models/setup_info.py", line 1140, in ast_unparse
    val = unparse(item.value, recurse=False)
  File "/home/croat/.local/lib/python3.7/site-packages/pipenv/vendor/requirementslib/models/setup_info.py", line 1004, in ast_unparse
    unparsed = unparsed[unparse(item.slice.value)]
TypeError: string indices must be integers

```
-------------------------------------------------------------------------------

<details><summary>$ pipenv --support</summary>

Pipenv version: `'2020.5.28'`

Pipenv location: `'/home/croat/.local/lib/python3.7/site-packages/pipenv'`

Python location: `'/usr/bin/python3.7'`

Python installations found:

  - `3.7.5`: `/usr/bin/python3.7m`
  - `3.7.5`: `/usr/bin/python3.7`
  - `3.6.9`: `/usr/bin/python3.6m`
  - `3.6.9`: `/usr/bin/python3`
  - `3.6.9`: `/usr/bin/python3.6`
  - `2.7.17`: `/usr/bin/python2`
  - `2.7.17`: `/usr/bin/python2.7`

PEP 508 Information:

```
{'implementation_name': 'cpython',
 'implementation_version': '3.7.5',
 'os_name': 'posix',
 'platform_machine': 'x86_64',
 'platform_python_implementation': 'CPython',
 'platform_release': '5.3.0-53-generic',
 'platform_system': 'Linux',
 'platform_version': '#47~18.04.1-Ubuntu SMP Thu May 7 13:10:50 UTC 2020',
 'python_full_version': '3.7.5',
 'python_version': '3.7',
 'sys_platform': 'linux'}
```

System environment variables:

  - `CLUTTER_IM_MODULE`
  - `CONDA_SHLVL`
  - `NVM_DIR`
  - `CONDA_EXE`
  - `XDG_MENU_PREFIX`
  - `LANG`
  - `HISTIGNORE`
  - `HISTCONTROL`
  - `DISPLAY`
  - `HISTTIMEFORMAT`
  - `OLDPWD`
  - `GNOME_SHELL_SESSION_MODE`
  - `EDITOR`
  - `COLORTERM`
  - `NVM_CD_FLAGS`
  - `BASH_SILENCE_DEPRECATION_WARNING`
  - `USERNAME`
  - `XDG_VTNR`
  - `SSH_AUTH_SOCK`
  - `S_COLORS`
  - `_CE_M`
  - `XDG_SESSION_ID`
  - `USER`
  - `DESKTOP_SESSION`
  - `QT4_IM_MODULE`
  - `TEXTDOMAINDIR`
  - `GNOME_TERMINAL_SCREEN`
  - `PWD`
  - `HOME`
  - `CONDA_PYTHON_EXE`
  - `TEXTDOMAIN`
  - `SSH_AGENT_PID`
  - `QT_ACCESSIBILITY`
  - `XDG_SESSION_TYPE`
  - `XDG_DATA_DIRS`
  - `_CE_CONDA`
  - `XDG_SESSION_DESKTOP`
  - `GJS_DEBUG_OUTPUT`
  - `GTK_MODULES`
  - `VISUAL`
  - `WINDOWPATH`
  - `TERM`
  - `SHELL`
  - `VTE_VERSION`
  - `QT_IM_MODULE`
  - `XMODIFIERS`
  - `IM_CONFIG_PHASE`
  - `NVM_BIN`
  - `XDG_CURRENT_DESKTOP`
  - `GPG_AGENT_INFO`
  - `GNOME_TERMINAL_SERVICE`
  - `XDG_SEAT`
  - `SHLVL`
  - `GDMSESSION`
  - `GNOME_DESKTOP_SESSION_ID`
  - `LOGNAME`
  - `DBUS_SESSION_BUS_ADDRESS`
  - `XDG_RUNTIME_DIR`
  - `XAUTHORITY`
  - `XDG_CONFIG_DIRS`
  - `PATH`
  - `PS1`
  - `HISTSIZE`
  - `GJS_DEBUG_TOPICS`
  - `HISTFILESIZE`
  - `SESSION_MANAGER`
  - `GTK_IM_MODULE`
  - `_`
  - `PIP_DISABLE_PIP_VERSION_CHECK`
  - `PYTHONDONTWRITEBYTECODE`
  - `PIP_SHIMS_BASE_MODULE`
  - `PIP_PYTHON_PATH`
  - `PYTHONFINDER_IGNORE_UNSUPPORTED`

Pipenv–specific environment variables:


Debug–specific environment variables:

  - `PATH`: `/home/croat/miniconda3/condabin:/home/croat/.nvm/versions/node/v14.3.0/bin:/home/croat/google-cloud-sdk/bin:/home/croat/bin:/home/croat/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin`
  - `SHELL`: `/bin/bash`
  - `EDITOR`: `emacs`
  - `LANG`: `en_US.UTF-8`
  - `PWD`: `/home/croat/test`


---------------------------

Contents of `Pipfile` ('/home/croat/test/Pipfile'):

```toml
[[source]]
name = "pypi"
url = "https://pypi.org/simple"
verify_ssl = true

[dev-packages]

[packages]
neuroglancer = {git = "https://github.com/google/neuroglancer.git", subdirectory = "python"}

[requires]
python_version = "3.7"

```

</details>


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