backon can't be used in along with &mut self

[Xuanwo]

async fn next(&mut self) -> Result<Option<Vec<oio::Entry>>> {
    { || self.inner.next() }
        .retry(&self.builder)
        .when(|e| e.is_temporary())
        .notify(|err, dur| {
            warn!(
                target: "opendal::service",
                "operation={} -> retry after {}s: error={:?}",
                Operation::Batch, dur.as_secs_f64(), err)
        })
        .map(|v| v.map_err(|e| e.set_persistent()))
        .await
}

Errors log:

error: captured variable cannot escape `FnMut` closure body
   --> src/layers/retry.rs:634:14
    |
633 |     async fn next(&mut self) -> Result<Option<Vec<oio::Entry>>> {
    |                    -------- variable defined here
634 |         { || self.inner.next() }
    |            - ----^^^^^^^^^^^^^
    |            | |
    |            | returns a reference to a captured variable which escapes the closure body
    |            | variable captured here
    |            inferred to be a `FnMut` closure
    |
    = note: `FnMut` closures only have access to their captured variables while they are executing...
    = note: ...therefore, they cannot allow references to captured variables to escape

[esemeniuc]

would love to see this fixed!

[Xuanwo]

would love to see this fixed!

I wish I can fix this too 🥹

No idea so far.