• 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: Ubuntu 18.04.5 LTS (Bionic Beaver)

• Poetry version: 1.1.1

• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/sam-willis/dd4a81fa2f1e608ac05441ed2fb6bb1a

Issue

If you install a package with a path dependency like:
test_path_dep = {path = "test_path"}

When you install the package, In your dist-info METADATA, you end up with the path dependant package listed like:
Requires-Dist: test_path_dep @ test_path

It looks to me according to https://www.python.org/dev/peps/pep-0508/ the @ symbol is used for URLS only, and that this isn't valid.

This causes the pkg_resources module's Distribution's class requires method to fail with:
pkg_resources.extern.packaging.requirements.InvalidRequirement: Invalid URL: test_path