Merge pull request #269546 from adisbladis/stdenv-meta-no-intermediate-alloc

  assertValidity = { meta, attrs }: let

      validity = checkValidity attrs;

      inherit (validity) valid;

  in validity // {

      # Throw an error if trying to evaluate a non-valid derivation

      # or, alternatively, just output a warning message.

      handled =

        {

          no = handleEvalIssue { inherit meta attrs; } { inherit (validity) reason errormsg; };

          warn = handleEvalWarning { inherit meta attrs; } { inherit (validity) reason errormsg; };

          yes = true;

        }.${validity.valid};

        (

          if valid == "yes" then true

          else if valid == "no" then (

            handleEvalIssue { inherit meta attrs; } { inherit (validity) reason errormsg; }

          )

          else if valid == "warn" then (

            handleEvalWarning { inherit meta attrs; } { inherit (validity) reason errormsg; }

          )

          else throw "Unknown validitiy: '${valid}'"

        );

  };

in { inherit assertValidity commonMeta; }