this derivation will be built:
  /nix/store/vcx11ax77fqzwpsdipcnxaz49j2g29l4-treefmt-check.drv
building '/nix/store/vcx11ax77fqzwpsdipcnxaz49j2g29l4-treefmt-check.drv'
treefmt-check> tribuchet: building on jamie
treefmt-check> treefmt v2.6.0traversed 173 files
treefmt-check> emitted 154 files for processing
treefmt-check> formatted 154 files (2 changed) in 221ms
treefmt-check>  M nix_update/patches.py
treefmt-check>  M tests/test_patches.py
treefmt-check> diff --git a/nix_update/patches.py b/nix_update/patches.py
treefmt-check> index 717fc03..c699b87 100644
treefmt-check> --- a/nix_update/patches.py
treefmt-check> +++ b/nix_update/patches.py
treefmt-check> @@ -163,7 +163,9 @@ def drop_merged_patches(opts: Options, package: Package) -> None:
treefmt-check>      if not package.patches or package.patches_position is None:
treefmt-check>          return
treefmt-check>      merged = _merged_patch_indices(opts)
treefmt-check> -    dropped = drop_patch_indices(package.filename, package.patches_position.line, merged)
treefmt-check> +    dropped = drop_patch_indices(
treefmt-check> +        package.filename, package.patches_position.line, merged
treefmt-check> +    )
treefmt-check>      for index in sorted(dropped):
treefmt-check>          patch = Path(str(package.patches[index]["path"])).name
treefmt-check>          info(f"Drop patch already applied upstream: {patch}")
treefmt-check> diff --git a/tests/test_patches.py b/tests/test_patches.py
treefmt-check> index b9559b0..ea58988 100644
treefmt-check> --- a/tests/test_patches.py
treefmt-check> +++ b/tests/test_patches.py
treefmt-check> @@ -21,10 +21,13 @@ def test_drop_local_and_fetchpatch_expressions(tmp_path: Path) -> None:
treefmt-check>  
treefmt-check>      drop_patch_indices(str(expression), 1, {1, 2})
treefmt-check>  
treefmt-check> -    assert expression.read_text() == """patches = [
treefmt-check> +    assert (
treefmt-check> +        expression.read_text()
treefmt-check> +        == """patches = [
treefmt-check>    ./keep.patch
treefmt-check>  ];
treefmt-check>  """
treefmt-check> +    )
treefmt-check>  
treefmt-check>  
treefmt-check>  def test_arbitrary_patch_expression_is_removed_by_index(tmp_path: Path) -> None:
treefmt-check> @@ -38,10 +41,13 @@ def test_arbitrary_patch_expression_is_removed_by_index(tmp_path: Path) -> None:
treefmt-check>  
treefmt-check>      drop_patch_indices(str(expression), 1, {1})
treefmt-check>  
treefmt-check> -    assert expression.read_text() == """patches = [
treefmt-check> +    assert (
treefmt-check> +        expression.read_text()
treefmt-check> +        == """patches = [
treefmt-check>    ./fix.patch
treefmt-check>  ];
treefmt-check>  """
treefmt-check> +    )
treefmt-check>  
treefmt-check>  
treefmt-check>  def test_compact_patch_list_entry_is_removed(tmp_path: Path) -> None:
error: Cannot build '/nix/store/vcx11ax77fqzwpsdipcnxaz49j2g29l4-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/8s6c3i70slgmnr3vq63bmph6k1wz7l6q-treefmt-check
       Last 25 log lines:
       > +    assert (
       > +        expression.read_text()
       > +        == """patches = [
       >    ./keep.patch
       >  ];
       >  """
       > +    )
       >
       >
       >  def test_arbitrary_patch_expression_is_removed_by_index(tmp_path: Path) -> None:
       > @@ -38,10 +41,13 @@ def test_arbitrary_patch_expression_is_removed_by_index(tmp_path: Path) -> None:
       >
       >      drop_patch_indices(str(expression), 1, {1})
       >
       > -    assert expression.read_text() == """patches = [
       > +    assert (
       > +        expression.read_text()
       > +        == """patches = [
       >    ./fix.patch
       >  ];
       >  """
       > +    )
       >
       >
       >  def test_compact_patch_list_entry_is_removed(tmp_path: Path) -> None:
       For full logs, run:
         nix log /nix/store/vcx11ax77fqzwpsdipcnxaz49j2g29l4-treefmt-check.drv