Compatibility with conda and poetry used simultaneously

[vxgmichel]

When a project uses both maturin and poetry simultaneously, it's common to run commands such as poetry run maturin develop.

However, this doesn't work in a conda environment. Here's an example using the robyn repository:

$ git clone https://github.com/sparckles/Robyn.git
[...]
$ cd Robyn
$ conda create -n robyn python
[...]
$ conda activate robyn
$ poetry install
[...]
± poetry run maturin develop
💥 maturin failed
  Caused by: Both VIRTUAL_ENV and CONDA_PREFIX are set. Please unset one of them

This is because poetry seems to set the VIRTUAL_ENV environment variable when it detects a conda env:

$ env
[...]
CONDA_PREFIX=/home/vinmic/miniconda/envs/parsecv3
[...]
# No VIRTUAL_ENV defined here
$ poetry run env
[...]
CONDA_PREFIX=/home/vinmic/miniconda/envs/robyn
[...]
VIRTUAL_ENV=/home/vinmic/miniconda/envs/robyn

Would it be possible to allow both environment variables to be set when their values are equal?