[[tool.poetry.source]] at last line of pyproject.toml causes all poetry commands to hang indefinitely #5592

• 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 Monterey Version 12.3.1
• Poetry version: 1.1.13
• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/iandesj/a584b988f09778192e06d5739d49bfb2

Issue

I ran into an issue where if and only if the [[tool.poetry.source]] array of tables was the last element in my pyproject.toml file, any poetry command would hang indefinitely. Anything from poetry config --list to poetry update|install|shell -vvv, like so:

Once I moved it up a position in the file (or anywhere above the last position) everything began working as expected. I wasn't sure if it had to do with a poor file encoding or phantom character that was throwing the whole thing off, so I deleted and re-wrote the pyproject from scratch several times. All with the same result or a hanging command.