safe {
    ret.map_or(true,
        |block|
            {
                block.as_ref().header.start_index ==
                    self.header.start_index.wrapping_add(BLOCK_CAP)
            })
}buffer space exhausted; sending this messages would overflow the stateassertion failed: self.poll_unparked(None).is_ready()requested buffer size too largemid > lenfailed to write whole bufferunsafe precondition(s) violated: invalid value for `char`

This indicates a bug in the program. This Undefined Behavior check is optional, and cannot be relied on for safety.unsafe precondition(s) violated: hint::unreachable_unchecked must never be reached

This indicates a bug in the program. This Undefined Behavior check is optional, and cannot be relied on for safety.called `Result::unwrap()` on an `Err` valueassertion failed: curr < self.inner.max_senders()cannot clone `Sender` -- too many outstanding senders?Ró