message: Replace match with expect()
diff: @@ -91,10 +91,11 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
  }
  let this = self.eval_context_mut();
  - let ptr = match this.memory().check_ptr_access(ptr, Size::from_bytes(len as u64), Align::from_bytes(1).unwrap())? {
  - Some(ptr) => ptr,
  - None => return Ok(()), // zero-sized access
  - };
  + let ptr = this.memory().check_ptr_access(
  + ptr,
  + Size::from_bytes(len as u64),
  + Align::from_bytes(1).unwrap()
  + )?.expect("we already checked for size 0");
  let rng = this.memory_mut().extra.rng.get_mut();
  let mut data = vec![0; len];
  