this derivation will be built:
  /nix/store/d69nglp2rm5fz3rcrllhrszv9hjm8l78-treefmt-check.drv
building '/nix/store/d69nglp2rm5fz3rcrllhrszv9hjm8l78-treefmt-check.drv'
treefmt-check> treefmt v2.5.0traversed 331 files
treefmt-check> emitted 260 files for processing
treefmt-check> formatted 260 files (1 changed) in 619ms
treefmt-check>  M harmonia-file-io-pure/src/source.rs
treefmt-check> diff --git a/harmonia-file-io-pure/src/source.rs b/harmonia-file-io-pure/src/source.rs
treefmt-check> index 13340f2..3279a8e 100644
treefmt-check> --- a/harmonia-file-io-pure/src/source.rs
treefmt-check> +++ b/harmonia-file-io-pure/src/source.rs
treefmt-check> @@ -37,7 +37,8 @@ pub trait FileSystemSource: Sized {
treefmt-check>      type Error: std::error::Error + 'static;
treefmt-check>      type Reader: AsyncRead + Unpin;
treefmt-check>      type Child: FileSystemSource<Error = Self::Error>;
treefmt-check> -    type Entries<'a>: futures_core::Stream<Item = Result<(String, Self::Child), Self::Error>> + Unpin
treefmt-check> +    type Entries<'a>: futures_core::Stream<Item = Result<(String, Self::Child), Self::Error>>
treefmt-check> +        + Unpin
treefmt-check>      where
treefmt-check>          Self: 'a;
treefmt-check>  
error: Cannot build '/nix/store/d69nglp2rm5fz3rcrllhrszv9hjm8l78-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/0rg79admya8jsa8dzwz8imqizgizp81n-treefmt-check
       Last 18 log lines:
       > treefmt v2.5.0traversed 331 files
       > emitted 260 files for processing
       > formatted 260 files (1 changed) in 619ms
       >  M harmonia-file-io-pure/src/source.rs
       > diff --git a/harmonia-file-io-pure/src/source.rs b/harmonia-file-io-pure/src/source.rs
       > index 13340f2..3279a8e 100644
       > --- a/harmonia-file-io-pure/src/source.rs
       > +++ b/harmonia-file-io-pure/src/source.rs
       > @@ -37,7 +37,8 @@ pub trait FileSystemSource: Sized {
       >      type Error: std::error::Error + 'static;
       >      type Reader: AsyncRead + Unpin;
       >      type Child: FileSystemSource<Error = Self::Error>;
       > -    type Entries<'a>: futures_core::Stream<Item = Result<(String, Self::Child), Self::Error>> + Unpin
       > +    type Entries<'a>: futures_core::Stream<Item = Result<(String, Self::Child), Self::Error>>
       > +        + Unpin
       >      where
       >          Self: 'a;
       >  
       For full logs, run:
         nix log /nix/store/d69nglp2rm5fz3rcrllhrszv9hjm8l78-treefmt-check.drv