hydra repro error

gistfile1.txt

$ curl https://hydra.nixos.org/build/121697319/reproduce | bash
Fri Jun 12 2020 15:53:12 --> 
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  4289  100  4289    0     0   5621      0 --:--:-- --:--:-- --:--:--  5613
storing inputs and results in /var/folders/hg/pt5wsk1n54d1prjyg9pff5_r0000gn/T//build-121697319...
fetching Git input ‘nixpkgs’ from ‘https://github.com/NixOS/nixpkgs.git’ (commit d6c8902ca44405abf9a36ded4070fafe6de1d867)...
Cloning into '/var/folders/hg/pt5wsk1n54d1prjyg9pff5_r0000gn/T//build-121697319/nixpkgs/source.tmp'...
remote: Enumerating objects: 178, done.
remote: Counting objects: 100% (178/178), done.
remote: Compressing objects: 100% (84/84), done.
remote: Total 1974922 (delta 120), reused 124 (delta 92), pack-reused 1974744
Receiving objects: 100% (1974922/1974922), 1.11 GiB | 3.58 MiB/s, done.
Resolving deltas: 100% (1352566/1352566), done.
Updating files: 100% (21857/21857), done.
Updating files: 100% (14025/14025), done.
Note: switching to 'd6c8902ca44405abf9a36ded4070fafe6de1d867'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by switching back to a branch.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -c with the switch command. Example:

  git switch -c <new-branch-name>

Or undo this operation with:

  git switch -

Turn off this advice by setting config variable advice.detachedHead to false

HEAD is now at d6c8902ca44 Merge pull request #89560 from primeos/chromium-backport
running nix-build...
using these flags: --arg nixpkgs { outPath = /var/folders/hg/pt5wsk1n54d1prjyg9pff5_r0000gn/T//build-121697319/nixpkgs/source; rev = "d6c8902ca44405abf9a36ded4070fafe6de1d867"; shortRev = "d6c8902"; revCount = "215018"; } -I nixpkgs=/var/folders/hg/pt5wsk1n54d1prjyg9pff5_r0000gn/T//build-121697319/nixpkgs/source --arg officialRelease false --arg supportedSystems [ "x86_64-darwin" ] --option extra-binary-caches https://hydra.nixos.org/ --option system x86_64-linux /var/folders/hg/pt5wsk1n54d1prjyg9pff5_r0000gn/T//build-121697319/nixpkgs/source/pkgs/top-level/release.nix -A nix.x86_64-darwin
error: path '/var/folders/hg/pt5wsk1n54d1prjyg9pff5_r0000gn/T/' has a trailing slash
Fri Jun 12 2020 16:01:19 (8m6s)