Conflicting file while installing python packages

[zokrezyl]

Describe the bug

/nix/store/my9s36hmlg79nic1v8fcf6w28mz0s3ys-python3-3.7.4-env.drv
building '/nix/store/my9s36hmlg79nic1v8fcf6w28mz0s3ys-python3-3.7.4-env.drv'...
collision between `/nix/store/kjw53bn6h89clwjq2v9w2dhg9zcwxn9j-python3.7-uvicorn-0.8.6/LICENSE.md' and `/nix/store/gs2hkkg9qygybv4pnqh0q45gmdlh8rrz-python3.7-starlette-0.12.6/LICENSE.md'
builder for '/nix/store/my9s36hmlg79nic1v8fcf6w28mz0s3ys-python3-3.7.4-env.drv' failed with exit code 25

To Reproduce
nix-env -if build.nix, with build.nix exerpt:

with import <nixpkgs> {};                                                                                                                                                                          
  let                                 
     uvicorn = python37.pkgs.buildPythonPackage rec {                                                        
       pname = "uvicorn";                                                                                    
       version = "0.8.6";                                                                                    
       src = fetchurl {                                                                                      
         sha256 = "8aa44f9d9c3082ef693950387ea25d376e32944df6d4071dbd8edc3c25a40c74";                        
         url = "https://files.pythonhosted.org/packages/c3/e5/5aa944f5b0f6987b7f9d629fd876ffe59815958e3a7f0d1  336c552f409d3/uvicorn-0.8.6.tar.gz";                                                                        
       };                                                                                                    
                                                                                                             
       doCheck = false;                                                                                      
       propagatedBuildInputs = [httptools uvloop h11 websockets Click];                                      
                                                                                                             
       meta = {                                                                                              
         homepage = "https://github.com/encode/uvicorn";                                                     
         description = "The lightning-fast ASGI server.";                                                    
       };                                                                                                    
     }; 
     starlette = python37.pkgs.buildPythonPackage rec {                                                      
        pname = "starlette";                                                                                          version = "0.12.6";                                                                                   
        src = python37.pkgs.fetchPypi {                                                                       
          inherit pname version;                                                                              
          sha256 = "c270f78af93c4ff4d7fbb9c10f9d9e15be1726284c39805f93ea48e3f45997d7";                        
        };                                                                                                    
                                                                                                              
        doCheck = false;                                                                                      
                                                                                                              
        meta = {                                                                                              
          homepage = "https://www.starlette.io/";                                                             
          description = "Starlette is a lightweight ASGI framework/toolkit, which is ideal for building high p  erformance asyncio services";                                                                               
        };                                                                                                    
      }; 

******
******
******
in python37.withPackages (ps: [ps.jedi ps.ordered-set ps.ipython ps.bpython ps.ptpython ps.hvac ps.influxd  b ps.lxml ps.mistune ps.cryptography ps.requests ps.pyyaml ps.rpyc ps.ujson ps.aiohttp ps.netaddr ps.paramik  o ps.jedi ps.jmespath ps.scapy ps.pip starlette stringcase deepdiff mmh3 itsdangerous httptools uvicorn ])  
                                                                                                                             

Expected behavior
Not sure... but there should be a way to avoid the conflict? Maybe a hook for the buildPythonPackage where one could delete a certain file to avoid the conflict

[FRidh]

This is an upstream bug, #23438. Closing as duplicate.

[zokrezyl]

Thanks for your time. I think I saw that report after i filed this one