Attribute Macro on_error 

#[on_error]

Attribute macro that runs cleanup code when a method returns an error.

Usage

#[on_error(self.cleanup())]
pub fn do_something(&mut self) -> Result<(), Error> {
    self.inner_work()?;
    Ok(())
}

For methods returning Result<&mut Self, E>, the macro properly handles the borrow by discarding the returned reference and returning a fresh Ok(self):

#[on_error(self.poison_and_cleanup())]
pub fn begin_some(&mut self) -> Result<&mut Self, ReflectError> {
    self.require_active()?;
    // ... implementation
    Ok(self)
}