this derivation will be built:
  /nix/store/b7wnx9rj0xzzcvf00l4yz9gibqz528qh-treefmt-check.drv
building '/nix/store/b7wnx9rj0xzzcvf00l4yz9gibqz528qh-treefmt-check.drv' on 'ssh-ng://customer@mac02'
building '/nix/store/b7wnx9rj0xzzcvf00l4yz9gibqz528qh-treefmt-check.drv'
treefmt-check> treefmt v2.5.0traversed 227 files
treefmt-check> emitted 191 files for processing
treefmt-check> formatted 191 files (1 changed) in 688ms
treefmt-check>  M packages/docs.nix
treefmt-check> diff --git a/packages/docs.nix b/packages/docs.nix
treefmt-check> index 14cd743..386264e 100644
treefmt-check> --- a/packages/docs.nix
treefmt-check> +++ b/packages/docs.nix
treefmt-check> @@ -45,12 +45,14 @@ let
treefmt-check>    ];
treefmt-check>  
treefmt-check>    pageEntry = name: "- [${titleOf "${src}/docs/${name}"}](${name})";
treefmt-check> -  sectionBlock = s: ''
treefmt-check> +  sectionBlock =
treefmt-check> +    s:
treefmt-check> +    ''
treefmt-check>  
treefmt-check> -    # ${s.title}
treefmt-check> +      # ${s.title}
treefmt-check>  
treefmt-check> -  ''
treefmt-check> -  + lib.concatMapStringsSep "\n" pageEntry s.pages;
treefmt-check> +    ''
treefmt-check> +    + lib.concatMapStringsSep "\n" pageEntry s.pages;
treefmt-check>  
treefmt-check>    summary = ''
treefmt-check>      # Summary
error: build of '/nix/store/b7wnx9rj0xzzcvf00l4yz9gibqz528qh-treefmt-check.drv' on 'ssh-ng://customer@mac02' failed: Cannot build '/nix/store/b7wnx9rj0xzzcvf00l4yz9gibqz528qh-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/93fqfccvazlynn41kh1ivlaw934l59i6-treefmt-check
       Last 25 log lines:
       > formatted 191 files (1 changed) in 688ms
       >  M packages/docs.nix
       > diff --git a/packages/docs.nix b/packages/docs.nix
       > index 14cd743..386264e 100644
       > --- a/packages/docs.nix
       > +++ b/packages/docs.nix
       > @@ -45,12 +45,14 @@ let
       >    ];
       >  
       >    pageEntry = name: "- [${titleOf "${src}/docs/${name}"}](${name})";
       > -  sectionBlock = s: ''
       > +  sectionBlock =
       > +    s:
       > +    ''
       >  
       > -    # ${s.title}
       > +      # ${s.title}
       >  
       > -  ''
       > -  + lib.concatMapStringsSep "\n" pageEntry s.pages;
       > +    ''
       > +    + lib.concatMapStringsSep "\n" pageEntry s.pages;
       >  
       >    summary = ''
       >      # Summary
       For full logs, run:
         nix log /nix/store/b7wnx9rj0xzzcvf00l4yz9gibqz528qh-treefmt-check.drv
error: Cannot build '/nix/store/b7wnx9rj0xzzcvf00l4yz9gibqz528qh-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/93fqfccvazlynn41kh1ivlaw934l59i6-treefmt-check