• 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: Win10 64bin
• Poetry version: 0.12
• Link of a Gist with the contents of your pyproject.toml file:

Issue

Maybe this is a feature request rather than a bug, but here goes:
I would expect there to be a way to exclude nested folders and their contents by excluding the root (not necessarily project root, but root of the nested folders instead) folder (possibly with trailing wildcard characters), however this doesn't seem possible at the moment.

Perhaps either Builder.find_excluded_files() should return an exhaustive list of files within nested subfolders, or the files within nested subfolders need to be excluded somewhere down the line in the build process.