Merge pull request #222291 from viraptor/pygls-fix-darwin

python310Packages.pygls: fix darwin on hydra

pkgs/development/python-modules/pygls/default.nix

@@ -1,4 +1,5 @@
 { lib
+, stdenv
 , buildPythonPackage
 , pythonOlder
 , fetchFromGitHub
@@ -45,6 +46,11 @@ buildPythonPackage rec {
   # Fixes hanging tests on Darwin
   __darwinAllowLocalNetworking = true;
 
+  preCheck = lib.optionalString stdenv.isDarwin ''
+    # Darwin issue: OSError: [Errno 24] Too many open files
+    ulimit -n 1024
+  '';
+
   pythonImportsCheck = [ "pygls" ];
 
   meta = with lib; {