Poetry UserWarning: warn_ungrouped_named_tokens_in_collection

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Question

/home/zach/project/.venv/lib/python3.7/site-packages/poetry/version/requirements.py:170: UserWarning: warn_ungrouped_named_tokens_in_collection: setting results name 'specifier' on And expression collides with '_original_end' on contained expression
  VERSION_SPEC = originalTextFor(_VERSION_SPEC)("specifier")
/home/zach/project/.venv/lib/python3.7/site-packages/poetry/version/requirements.py:173: UserWarning: warn_ungrouped_named_tokens_in_collection: setting results name 'marker' on And expression collides with '_original_end' on contained expression
  MARKER_EXPR = originalTextFor(MARKER_EXPR())("marker")

I’ve been seeing the above warning messages while using poetry commands such as

poetry install
poetry run
poetry shell

I pip installed poetry 0.12.17 in my Python 3.7.0 virtual environment.

[paulmcg-iio]

Pyparsing 2.4.2 (pushed to PyPI this evening) disables these warnings by default

[zachliu]

Pyparsing 2.4.2 is not solving this problem for me:

/usr/local/lib/python3.6/dist-packages/poetry/version/requirements.py:170: UserWarning: warn_ungrouped_named_tokens_in_collection: setting results name 'specifier' on And expression collides with '_original_end' on contained expression
VERSION_SPEC = originalTextFor(_VERSION_SPEC)("specifier")
/usr/local/lib/python3.6/dist-packages/poetry/version/requirements.py:173: UserWarning: warn_ungrouped_named_tokens_in_collection: setting results name 'marker' on And expression collides with '_original_end' on contained expression

Here’s my pyproject.toml:

[tool.poetry.dependencies]
python = ">=2.7, != 3.0.*, != 3.1.*, != 3.2.*, != 3.3.*"
selenium = "^3.14"
future = "^0.16.0"

[tool.poetry.dev-dependencies]
pytest = "^3.0.6"
pylama = {version = "^7.6", python = ">= 3.4" }
pylint = { version = "^2.2", python = ">= 3.4" }
pytest-cov = "^2.6"
black = { version = "18.9b0", python = ">= 3.6" }
sphinx = { version = "^2.0", python = ">= 3.5" }
mock = "^1.3.0"

This is in my poetry.lock:

[[package]]
category = "dev"
description = "Python parsing module"
marker = "python_version >= \"3.5\""
name = "pyparsing"
optional = false
python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
version = "2.4.2"

What about pyparsing 2.4.0?