this derivation will be built:
  /nix/store/9hbr31zarvmk62g26fcs9q082h367wvj-treefmt-check.drv
building '/nix/store/9hbr31zarvmk62g26fcs9q082h367wvj-treefmt-check.drv'
treefmt-check> treefmt v2.5.0traversed 26 files
treefmt-check> emitted 19 files for processing
treefmt-check> formatted 19 files (1 changed) in 37ms
treefmt-check>  M nix_fast_build/__init__.py
treefmt-check> diff --git a/nix_fast_build/__init__.py b/nix_fast_build/__init__.py
treefmt-check> index 7fe459f..4c3d97a 100644
treefmt-check> --- a/nix_fast_build/__init__.py
treefmt-check> +++ b/nix_fast_build/__init__.py
treefmt-check> @@ -1110,7 +1110,9 @@ class Build:
treefmt-check>          logger.debug("run %s", shlex.join(cmd))
treefmt-check>          env = os.environ.copy()
treefmt-check>          env["NIX_SSHOPTS"] = " ".join(opts.remote_ssh_options)
treefmt-check> -        proc = await asyncio.create_subprocess_exec(*cmd, env=env, stdout=sys.stderr.fileno())
treefmt-check> +        proc = await asyncio.create_subprocess_exec(
treefmt-check> +            *cmd, env=env, stdout=sys.stderr.fileno()
treefmt-check> +        )
treefmt-check>          await exit_stack.enter_async_context(ensure_stop(proc, cmd))
treefmt-check>          return await proc.wait()
treefmt-check>  
treefmt-check> @@ -1438,7 +1440,9 @@ async def run_niks3_upload(
treefmt-check>                  opts,
treefmt-check>              )
treefmt-check>              logger.debug("run %s", shlex.join(cmd))
treefmt-check> -            proc = await asyncio.create_subprocess_exec(*cmd, env=env, stderr=sys.stderr.fileno())
treefmt-check> +            proc = await asyncio.create_subprocess_exec(
treefmt-check> +                *cmd, env=env, stderr=sys.stderr.fileno()
treefmt-check> +            )
treefmt-check>              rc = await proc.wait()
treefmt-check>              duration = timeit.default_timer() - start_time
treefmt-check>  
error: Cannot build '/nix/store/9hbr31zarvmk62g26fcs9q082h367wvj-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/ms554sxb8kk3qasnysxlgkka72zfb0zi-treefmt-check
       Last 25 log lines:
       > index 7fe459f..4c3d97a 100644
       > --- a/nix_fast_build/__init__.py
       > +++ b/nix_fast_build/__init__.py
       > @@ -1110,7 +1110,9 @@ class Build:
       >          logger.debug("run %s", shlex.join(cmd))
       >          env = os.environ.copy()
       >          env["NIX_SSHOPTS"] = " ".join(opts.remote_ssh_options)
       > -        proc = await asyncio.create_subprocess_exec(*cmd, env=env, stdout=sys.stderr.fileno())
       > +        proc = await asyncio.create_subprocess_exec(
       > +            *cmd, env=env, stdout=sys.stderr.fileno()
       > +        )
       >          await exit_stack.enter_async_context(ensure_stop(proc, cmd))
       >          return await proc.wait()
       >  
       > @@ -1438,7 +1440,9 @@ async def run_niks3_upload(
       >                  opts,
       >              )
       >              logger.debug("run %s", shlex.join(cmd))
       > -            proc = await asyncio.create_subprocess_exec(*cmd, env=env, stderr=sys.stderr.fileno())
       > +            proc = await asyncio.create_subprocess_exec(
       > +                *cmd, env=env, stderr=sys.stderr.fileno()
       > +            )
       >              rc = await proc.wait()
       >              duration = timeit.default_timer() - start_time
       >  
       For full logs, run:
         nix log /nix/store/9hbr31zarvmk62g26fcs9q082h367wvj-treefmt-check.drv