these 3 derivations will be built:
  /nix/store/wjzlxkkjq0vjk11g1wvq6hlp5vaavd49-treefmt.toml.drv
  /nix/store/sbx6s43227d4ix84id05k0nc6d6mjjln-treefmt.drv
  /nix/store/kjvai1hz5zbqy4rf2xlamchnw612rm82-treefmt-check.drv
building '/nix/store/wjzlxkkjq0vjk11g1wvq6hlp5vaavd49-treefmt.toml.drv' on 'ssh-ng://customer@mac02'
building '/nix/store/wjzlxkkjq0vjk11g1wvq6hlp5vaavd49-treefmt.toml.drv'
treefmt.toml> structuredAttrs is enabled
building '/nix/store/sbx6s43227d4ix84id05k0nc6d6mjjln-treefmt.drv' on 'ssh-ng://customer@mac02'
building '/nix/store/sbx6s43227d4ix84id05k0nc6d6mjjln-treefmt.drv'
building '/nix/store/kjvai1hz5zbqy4rf2xlamchnw612rm82-treefmt-check.drv' on 'ssh-ng://customer@mac02'
building '/nix/store/kjvai1hz5zbqy4rf2xlamchnw612rm82-treefmt-check.drv'
treefmt-check> treefmt v2.5.0traversed 45 files
treefmt-check> emitted 18 files for processing
treefmt-check> formatted 18 files (1 changed) in 78ms
treefmt-check>  M mpd/tests.py
treefmt-check> diff --git a/mpd/tests.py b/mpd/tests.py
treefmt-check> index 36c4193..adbe45c 100755
treefmt-check> --- a/mpd/tests.py
treefmt-check> +++ b/mpd/tests.py
treefmt-check> @@ -46,8 +46,7 @@ class TestMPDClient(unittest.TestCase):
treefmt-check>          self.socket_mock = self.socket_patch.start()
treefmt-check>          self.socket_mock.getaddrinfo.return_value = [range(5)]
treefmt-check>  
treefmt-check> -        self.socket_mock.socket.side_effect = (
treefmt-check> -            lambda *a, **kw:
treefmt-check> +        self.socket_mock.socket.side_effect = lambda *a, **kw: (
treefmt-check>              # Create a new socket.socket() mock with default attributes,
treefmt-check>              # each time we are calling it back (otherwise, it keeps set
treefmt-check>              # attributes across calls).
error: build of '/nix/store/kjvai1hz5zbqy4rf2xlamchnw612rm82-treefmt-check.drv' on 'ssh-ng://customer@mac02' failed: Cannot build '/nix/store/kjvai1hz5zbqy4rf2xlamchnw612rm82-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/w1c4yjy9h3wj0r6sndw3nkz0w2v4vmw5-treefmt-check
       Last 18 log lines:
       > treefmt v2.5.0traversed 45 files
       > emitted 18 files for processing
       > formatted 18 files (1 changed) in 78ms
       >  M mpd/tests.py
       > diff --git a/mpd/tests.py b/mpd/tests.py
       > index 36c4193..adbe45c 100755
       > --- a/mpd/tests.py
       > +++ b/mpd/tests.py
       > @@ -46,8 +46,7 @@ class TestMPDClient(unittest.TestCase):
       >          self.socket_mock = self.socket_patch.start()
       >          self.socket_mock.getaddrinfo.return_value = [range(5)]
       >  
       > -        self.socket_mock.socket.side_effect = (
       > -            lambda *a, **kw:
       > +        self.socket_mock.socket.side_effect = lambda *a, **kw: (
       >              # Create a new socket.socket() mock with default attributes,
       >              # each time we are calling it back (otherwise, it keeps set
       >              # attributes across calls).
       For full logs, run:
         nix log /nix/store/kjvai1hz5zbqy4rf2xlamchnw612rm82-treefmt-check.drv
error: Cannot build '/nix/store/kjvai1hz5zbqy4rf2xlamchnw612rm82-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/w1c4yjy9h3wj0r6sndw3nkz0w2v4vmw5-treefmt-check