anchor.diff:      pytest-randomly
       pytestCheckHook
       postgresql
  -  ];
  +  ]
  +  ++ passthru.optional-dependencies.c
  +  ++ passthru.optional-dependencies.pool;
   
     disabledTests = [
  -    # linters shouldn't be run in checks
  +    # don't depend on mypy for tests
       "test_version"
  +    "test_package_version"
     ];
   
     disabledTestPaths = [
  -    # TODO: requires the pooled variant
  -    "tests/pool/"
       # Network access
       "tests/test_dns.py"
       "tests/test_dns_srv.py"
  
positive.code: , pythonOlder
  , substituteAll
  
  # links (libpq)
  , postgresql
  
  # propagates
  , backports-zoneinfo
  , typing-extensions
  
  # docs
  , furo
  
negative.code: let
    pname = "psycopg";
    version = "3.0.16";
  
    src = fetchFromGitHub {
      owner = "psycopg";
  