this derivation will be built:
  /nix/store/pv9khisqdrxmimd3yz25qvmhkqablzln-treefmt-check.drv
building '/nix/store/pv9khisqdrxmimd3yz25qvmhkqablzln-treefmt-check.drv'
treefmt-check> treefmt v2.5.0traversed 316 files
treefmt-check> emitted 248 files for processing
treefmt-check> formatted 248 files (1 changed) in 343ms
treefmt-check>  M harmonia-cache/src/tls.rs
treefmt-check> diff --git a/harmonia-cache/src/tls.rs b/harmonia-cache/src/tls.rs
treefmt-check> index 18ee01a..9631120 100644
treefmt-check> --- a/harmonia-cache/src/tls.rs
treefmt-check> +++ b/harmonia-cache/src/tls.rs
treefmt-check> @@ -86,7 +86,10 @@ mod tests {
treefmt-check>              insecure_permissions(&key_file(dir.path(), 0o644), None),
treefmt-check>              Some(0o644)
treefmt-check>          );
treefmt-check> -        assert_eq!(insecure_permissions(&key_file(dir.path(), 0o600), None), None);
treefmt-check> +        assert_eq!(
treefmt-check> +            insecure_permissions(&key_file(dir.path(), 0o600), None),
treefmt-check> +            None
treefmt-check> +        );
treefmt-check>      }
treefmt-check>  
treefmt-check>      #[test]
error: Cannot build '/nix/store/pv9khisqdrxmimd3yz25qvmhkqablzln-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/9n5ld35x4xqagxzfbrby8d4wllyh481y-treefmt-check
       Last 20 log lines:
       > treefmt v2.5.0traversed 316 files
       > emitted 248 files for processing
       > formatted 248 files (1 changed) in 343ms
       >  M harmonia-cache/src/tls.rs
       > diff --git a/harmonia-cache/src/tls.rs b/harmonia-cache/src/tls.rs
       > index 18ee01a..9631120 100644
       > --- a/harmonia-cache/src/tls.rs
       > +++ b/harmonia-cache/src/tls.rs
       > @@ -86,7 +86,10 @@ mod tests {
       >              insecure_permissions(&key_file(dir.path(), 0o644), None),
       >              Some(0o644)
       >          );
       > -        assert_eq!(insecure_permissions(&key_file(dir.path(), 0o600), None), None);
       > +        assert_eq!(
       > +            insecure_permissions(&key_file(dir.path(), 0o600), None),
       > +            None
       > +        );
       >      }
       >  
       >      #[test]
       For full logs, run:
         nix log /nix/store/pv9khisqdrxmimd3yz25qvmhkqablzln-treefmt-check.drv