nix ion-1.0.5 package broken on Mac OS X
Getting the following trying to install ion on Mac OS X via nix
$ nix-env -i ion-1.0.5 --show-trace
installing 'ion-1.0.5'
error: while evaluating the attribute 'handled' at /nix/store/qa627fk56c79sfswvljrjcxybim61423-nixpkgs-19.09pre190327.54f385241e6/nixpkgs/pkgs/stdenv/generic/check-meta.nix:251:7:
while evaluating 'handleEvalIssue' at /nix/store/qa627fk56c79sfswvljrjcxybim61423-nixpkgs-19.09pre190327.54f385241e6/nixpkgs/pkgs/stdenv/generic/check-meta.nix:147:38, called from /nix/store/qa627fk56c79sfswvljrjcxybim61423-nixpkgs-19.09pre190327.54f385241e6/nixpkgs/pkgs/stdenv/generic/check-meta.nix:252:14:
Package ‘ion-1.0.5’ in /nix/store/qa627fk56c79sfswvljrjcxybim61423-nixpkgs-19.09pre190327.54f385241e6/nixpkgs/pkgs/shells/ion/default.nix:19 is marked as broken, refusing to evaluate.
a) For `nixos-rebuild` you can set
{ nixpkgs.config.allowBroken = true; }
in configuration.nix to override this.
b) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
{ allowBroken = true; }
to ~/.config/nixpkgs/config.nix.