Installation of extras: maximum recursion depth exceeded

[elben10]

• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: macOS-10.15.5-x86_64-i386-64bit
• Poetry version: 1.0.9
• Link of a Gist with the contents of your pyproject.toml file:

Issue

When I'm installing pyproject2.toml in the gist everything works fine (poetry install), but when I try to install extra dependencies in pyproject1.toml (poetry install -E dask) I receive the following error message

[RecursionError]
maximum recursion depth exceeded

I guess it could be related to #1138

[abn]

Issue can be reproduced with 1.1.0a1.

Stack Trace

Installing dependencies from lock file

  RecursionError

  maximum recursion depth exceeded

  at ~/.poetry/lib/poetry/utils/extras.py:47 in <genexpr>
      43|             if package:
      44|                 yield package.name
      45|                 # Recurse for dependencies
      46|                 for dependency_package_name in _extra_packages(
    > 47|                     dependency.name for dependency in package.requires
      48|                 ):
      49|                     yield dependency_package_name
      50| 
      51|     return _extra_packages(extra_package_names)

  Stack trace:

    1  ~/.poetry/lib/poetry/utils/extras.py:39 in _extra_packages
        37|         """Recursively find dependencies for packages names"""
        38|         # for each extra pacakge name
      > 39|         for package_name in package_names:
        40|             # Find the actual Package object. A missing key indicates an implicit
        41|             # dependency (like setuptools), which should be ignored

    2  ~/.poetry/lib/poetry/utils/extras.py:46 in _extra_packages
        44|                 yield package.name
        45|                 # Recurse for dependencies
      > 46|                 for dependency_package_name in _extra_packages(
        47|                     dependency.name for dependency in package.requires
        48|                 ):

  ...  Previous frame repeated 983 times

  986  ~/.poetry/lib/poetry/utils/extras.py:46 in _extra_packages
        44|                 yield package.name
        45|                 # Recurse for dependencies
      > 46|                 for dependency_package_name in _extra_packages(
        47|                     dependency.name for dependency in package.requires
        48|                 ):

  987  ~/.poetry/lib/poetry/installation/installer.py:482 in _get_extra_packages
        480|             extras = self._locker.lock_data.get("extras", {})
        481| 
      > 482|         return list(get_extra_package_names(repo.packages, extras, self._extras))
        483| 
        484|     def _get_installer(self):  # type: () -> BaseInstaller

  988  ~/.poetry/lib/poetry/installation/installer.py:402 in _get_operations_from_lock
        400|         ops = []
        401| 
      > 402|         extra_packages = self._get_extra_packages(locked_repository)
        403|         for locked in locked_repository.packages:
        404|             is_installed = False

  989  ~/.poetry/lib/poetry/installation/installer.py:184 in _do_install
        182|             # Filter the operations by comparing it with what is
        183|             # currently installed
      > 184|             ops = self._get_operations_from_lock(locked_repository)
        185| 
        186|         self._populate_local_repo(local_repo, ops)

  990  ~/.poetry/lib/poetry/installation/installer.py:74 in run
         72| 
         73|         local_repo = Repository()
      >  74|         self._do_install(local_repo)
         75| 
         76|         return 0

  991  ~/.poetry/lib/poetry/console/commands/install.py:63 in handle
        61|         installer.verbose(self.option("verbose"))
        62| 
      > 63|         return_code = installer.run()
        64| 
        65|         if return_code != 0:

  992  ~/.poetry/lib/poetry/_vendor/py3.8/cleo/commands/command.py:92 in wrap_handle
         90|         self._command = command
         91| 
      >  92|         return self.handle()
         93| 
         94|     def handle(self):  # type: () -> Optional[int]

  993  ~/.poetry/lib/poetry/_vendor/py3.8/clikit/api/command/command.py:171 in _do_handle
        169|         handler_method = self._config.handler_method
        170| 
      > 171|         return getattr(handler, handler_method)(args, io, self)
        172| 
        173|     def __repr__(self):  # type: () -> str

  994  ~/.poetry/lib/poetry/_vendor/py3.8/clikit/api/command/command.py:120 in handle
        118|     def handle(self, args, io):  # type: (Args, IO) -> int
        119|         try:
      > 120|             status_code = self._do_handle(args, io)
        121|         except KeyboardInterrupt:
        122|             if io.is_debug():

  995  ~/.poetry/lib/poetry/_vendor/py3.8/clikit/console_application.py:131 in run
        129|             parsed_args = resolved_command.args
        130| 
      > 131|             status_code = command.handle(parsed_args, io)
        132|         except KeyboardInterrupt:
        133|             status_code = 1

[yajo]

With this pyproject.toml also happens the same:

[tool.poetry.dependencies]
python = "^3.6.1"
ansible = "^2.9.9"
mkdocs = {version = "^1.1.2", optional = true}
mkdocs-material = {version = "^5.5.3", optional = true}

[tool.poetry.extras]
docs = ["mkdocs", "mkdocs-material"]

➤ poetry --version
Poetry version 1.0.10

[github-actions]

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