Backtrace (most recent call first):
File "rust:library/core/src/
option.rs", line 1221, in core::option::expect_none_failed
File "<unknown>", line 0, in turnik4::thread_downloader::thread_downloader::{{closure}}
File "<unknown>", line 0, in <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll
File "<unknown>", line 0, in tokio::runtime::task::core::Core<T,S>::poll
File "<unknown>", line 0, in <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
File "<unknown>", line 0, in tokio::runtime::task::harness::Harness<T,S>::poll
File "<unknown>", line 0, in std::thread::local::LocalKey<T>::with
File "<unknown>", line 0, in tokio::task::local::LocalSet::tick
File "<unknown>", line 0, in <tokio::task::local::LocalSet as core::future::future::Future>::poll
File "<unknown>", line 0, in <core::future::from_generator::GenFuture<T> as