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poetry picks pypy dependencies when executed in cpython environment

See original GitHub issue

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: Windows 10
Poetry version: 1.1.4
Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/gragib/07f146d5b0c978674376c2e1d63edd79

Issue

If a dependency has one or more subdependency specific to a Python implementation, poetry ignores the implementation details.

E.g. slash has the following requirements:

IPython==1.2.1; implementation_name=='pypy'
IPython; implementation_name!='pypy'

If your project depends on slash, in a cpython 3.7 environment, poetry uses

ipython==1.2.1

instead of

ipython==*

[ARCHIVED] Issue

Compiling this file

[tool.poetry]
name = "test"
version = "0.1.0"
description = ""
authors = ["None <none@example.com>"]

[tool.poetry.dependencies]
python = "3.7"
slash = "*"

[tool.poetry.dev-dependencies]

[build-system]
requires = ["poetry-core>=1.0.0"]
build-backend = "poetry.core.masonry.api"

installs these packages

arrow==0.17.0
atomicwrites==1.4.0
attrs==20.3.0
Brotli==1.0.9
certifi==2020.11.8
chardet==3.0.4
colorama==0.4.4
confetti==2.5.3
dessert==1.4.1
emport==1.3.1
gossip==2.4.0
idna==2.10
ipython==1.2.1
Jinja2==2.11.2
libtmux==0.8.5
Logbook==1.5.3
MarkupSafe==1.1.1
munch==2.5.0
ordered-set==4.0.2
py==1.9.0
pyparsing==2.4.7
pyreadline==2.1
python-dateutil==2.8.1
raven==6.10.0
requests==2.25.0
sentinels==1.0.0
six==1.15.0
slash==1.12.0
SQLAlchemy==1.3.20
urllib3==1.26.2
vintage==0.4.1

Simply installing slash using pip installs these packages:

arrow==0.17.0
atomicwrites==1.4.0
attrs==20.3.0
backcall==0.2.0
Brotli==1.0.9
certifi==2020.11.8
chardet==3.0.4
colorama==0.4.4
confetti==2.5.3
decorator==4.4.2
dessert==1.4.1
emport==1.3.1
gossip==2.4.0
idna==2.10
ipython==7.19.0
ipython-genutils==0.2.0
jedi==0.17.2
Jinja2==2.11.2
libtmux==0.8.5
Logbook==1.5.3
MarkupSafe==1.1.1
munch==2.5.0
ordered-set==4.0.2
parso==0.7.1
pickleshare==0.7.5
prompt-toolkit==3.0.8
py==1.9.0
Pygments==2.7.2
pyparsing==2.4.7
python-dateutil==2.8.1
raven==6.10.0
requests==2.25.0
sentinels==1.0.0
six==1.15.0
slash==1.12.0
SQLAlchemy==1.3.20
traitlets==5.0.5
urllib3==1.26.2
vintage==0.4.1
wcwidth==0.2.5

My understanding is that the two lists should be identical. They are not.