Dispatch Dropped Without Returning Error Backtrace

---- tests::t5 stdout ----
thread 'tests::t5' panicked at 'dispatch dropped without returning error', ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/hyper-0.13.1/src/client/conn.rs:236:35
stack backtrace:
   0:     0x55bffae03ba4 - backtrace::backtrace::libunwind::trace::h65597d255cb1398b
                               at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/libunwind.rs:88
   1:     0x55bffae03ba4 - backtrace::backtrace::trace_unsynchronized::hd4f479d7150ec4a0
                               at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/mod.rs:66
   2:     0x55bffae03ba4 - std::sys_common::backtrace::_print_fmt::h015072984a2b172c
                               at src/libstd/sys_common/backtrace.rs:77
   3:     0x55bffae03ba4 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h6df05d3335f32194
                               at src/libstd/sys_common/backtrace.rs:61
   4:     0x55bffae27f7c - core::fmt::write::h1f444f4312eb6c27
                               at src/libcore/fmt/mod.rs:1028
   5:     0x55bffab041f5 - std::io::Write::write_fmt::h97a74fcf9ff86718
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/io/mod.rs:1412
   6:     0x55bffadfcde1 - std::io::impls::<impl std::io::Write for alloc::boxed::Box<W>>::write_fmt::h3a4dac344256f49c
                               at src/libstd/io/impls.rs:141
   7:     0x55bffae0622e - std::sys_common::backtrace::_print::h8a6df0fa81d6af62
                               at src/libstd/sys_common/backtrace.rs:65
   8:     0x55bffae0622e - std::sys_common::backtrace::print::h6f05b4733407e509
                               at src/libstd/sys_common/backtrace.rs:50
   9:     0x55bffae0622e - std::panicking::default_hook::{{closure}}::h0d0a23bd02315dd8
                               at src/libstd/panicking.rs:188
  10:     0x55bffae05ec8 - std::panicking::default_hook::h8d15a9aecb4efac6
                               at src/libstd/panicking.rs:202
  11:     0x55bffae0692b - std::panicking::rust_panic_with_hook::hbe174577402a475d
                               at src/libstd/panicking.rs:464
  12:     0x55bffaddbe33 - std::panicking::begin_panic::hdb51c0e4ca11f455
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/panicking.rs:400
  13:     0x55bffaa06730 - hyper::client::conn::SendRequest<B>::send_request_retryable::{{closure}}::h9b5873099e84dbb4
                               at /tmp/dis/<::std::macros::panic macros>:3
  14:     0x55bffaab9f48 - <futures_util::future::future::then::Then<Fut1,Fut2,F> as core::future::future::Future>::poll::{{closure}}::hadf736bdba18990c
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.1/src/future/future/then.rs:44
  15:     0x55bffaa3771d - futures_util::future::future::chain::Chain<Fut1,Fut2,Data>::poll::h9ec8926b84cf2b87
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.1/src/future/future/chain.rs:54
  16:     0x55bffaab9d9e - <futures_util::future::future::then::Then<Fut1,Fut2,F> as core::future::future::Future>::poll::h7fe3d8eee395bbc0
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.1/src/future/future/then.rs:44
  17:     0x55bffaa46214 - <futures_util::future::either::Either<A,B> as core::future::future::Future>::poll::hbe737312a1019c7c
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.1/src/future/either.rs:62
  18:     0x55bffaa45a34 - <futures_util::future::either::Either<A,B> as core::future::future::Future>::poll::h05503ce471456786
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.1/src/future/either.rs:62
  19:     0x55bffaa45974 - <F as futures_core::future::TryFuture>::try_poll::ha2b91524f0959bfa
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/futures-core-0.3.1/src/future.rs:83
  20:     0x55bffa9aa2c1 - <futures_util::future::try_future::map_err::MapErr<Fut,F> as core::future::future::Future>::poll::h737e84fca9b45f97
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.1/src/future/try_future/map_err.rs:43
  21:     0x55bffa9ab934 - <F as futures_core::future::TryFuture>::try_poll::h49784e8305e79c04
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/futures-core-0.3.1/src/future.rs:83
  22:     0x55bffa9f58d3 - <futures_util::future::try_future::map_ok::MapOk<Fut,F> as core::future::future::Future>::poll::hade7a3d62a36ecfa
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.1/src/future/try_future/map_ok.rs:45
  23:     0x55bffa9f6344 - <F as futures_core::future::TryFuture>::try_poll::haefbb599b1f23a31
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/futures-core-0.3.1/src/future.rs:83
  24:     0x55bffa9f5993 - <futures_util::future::try_future::map_ok::MapOk<Fut,F> as core::future::future::Future>::poll::hfbc8359cfe4bc66b
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.1/src/future/try_future/map_ok.rs:45
  25:     0x55bffaa45b58 - <futures_util::future::either::Either<A,B> as core::future::future::Future>::poll::h354f405d59b7cc11
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.1/src/future/either.rs:63
  26:     0x55bffaa45d18 - <futures_util::future::either::Either<A,B> as core::future::future::Future>::poll::h6940f22ecb434b71
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.1/src/future/either.rs:63
  27:     0x55bffaa459a4 - <F as futures_core::future::TryFuture>::try_poll::hd0900e81cc4b51a4
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/futures-core-0.3.1/src/future.rs:83
  28:     0x55bffaa2d84b - futures_util::future::try_future::try_chain::TryChain<Fut1,Fut2,Data>::poll::heaedea8e63fe709b
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.1/src/future/try_future/try_chain.rs:58
  29:     0x55bffab02511 - <futures_util::future::try_future::and_then::AndThen<Fut1,Fut2,F> as core::future::future::Future>::poll::h1a402026f622e14d
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.1/src/future/try_future/and_then.rs:46
  30:     0x55bffaae6110 - hyper::client::Client<C,B>::retryably_send_request::{{closure}}::hcba2da908b1cea5c
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/hyper-0.13.1/src/client/mod.rs:254
  31:     0x55bffab009c1 - <futures_util::future::poll_fn::PollFn<F> as core::future::future::Future>::poll::hdefbffcaf68348ae
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.1/src/future/poll_fn.rs:54
  32:     0x55bffab89e91 - <core::pin::Pin<P> as core::future::future::Future>::poll::h2975b47605d4af13
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libcore/future/future.rs:119
  33:     0x55bffab7aa19 - <hyper::client::ResponseFuture as core::future::future::Future>::poll::ha79ddb04cce60858
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/hyper-0.13.1/src/client/mod.rs:607
  34:     0x55bffaa9c2f5 - std::future::poll_with_tls_context::{{closure}}::h18426b6fa6241b3f
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/future.rs:121
  35:     0x55bffaa988ac - std::future::get_task_context::h585ac40c1738cf2d
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/future.rs:111
  36:     0x55bffaa9bf04 - std::future::poll_with_tls_context::h07ed90e195dd9cc6
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/future.rs:121
  37:     0x55bffaab4df9 - dispatch_panic::tests::req::{{closure}}::hf36f6ec59a6f35e7
                               at src/lib.rs:13
  38:     0x55bffaa9d12b - <std::future::GenFuture<T> as core::future::future::Future>::poll::{{closure}}::h4820a164777358d7
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/future.rs:43
  39:     0x55bffaa9aac9 - std::future::set_task_context::h48c835eace8a6c9a
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/future.rs:79
  40:     0x55bffaa9c8b6 - <std::future::GenFuture<T> as core::future::future::Future>::poll::h3601d23d640175fc
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/future.rs:43
  41:     0x55bffaa9c31d - std::future::poll_with_tls_context::{{closure}}::h2285e8b87c1f6196
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/future.rs:121
  42:     0x55bffaa9860c - std::future::get_task_context::h4ad4b713816387a4
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/future.rs:111
  43:     0x55bffaa9c10d - std::future::poll_with_tls_context::h81512a473fb06bdf
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/future.rs:121
  44:     0x55bffaab58f6 - dispatch_panic::tests::t5::{{closure}}::h1ab6a1ef061ed738
                               at src/lib.rs:22
  45:     0x55bffaa9e18b - <std::future::GenFuture<T> as core::future::future::Future>::poll::{{closure}}::hdac66c7064a88bda
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/future.rs:43
  46:     0x55bffaa9a439 - std::future::set_task_context::h1185d26555ea8057
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/future.rs:79
  47:     0x55bffaa9cad6 - <std::future::GenFuture<T> as core::future::future::Future>::poll::h74e2ada9d2ba4bc0
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/future.rs:43
  48:     0x55bffaa60d4f - tokio::runtime::basic_scheduler::BasicScheduler<P>::block_on::h6e72c75363eaed0a
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.2.9/src/runtime/basic_scheduler.rs:138
  49:     0x55bffaa96d39 - tokio::runtime::Runtime::block_on::{{closure}}::h356adb8aa34d0bb3
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.2.9/src/runtime/mod.rs:411
  50:     0x55bffaa7e0df - tokio::runtime::context::enter::h5e6bde75fe274e4a
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.2.9/src/runtime/context.rs:72
  51:     0x55bffaa37c23 - tokio::runtime::handle::Handle::enter::h4f7b30a802fcb10c
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.2.9/src/runtime/handle.rs:33
  52:     0x55bffaa9696b - tokio::runtime::Runtime::block_on::h7bcee39814763f57
                               at ~/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.2.9/src/runtime/mod.rs:408
  53:     0x55bffaab783c - dispatch_panic::tests::t5::h93ab5118e961840b
                               at src/lib.rs:22
  54:     0x55bffaab582a - dispatch_panic::tests::t5::{{closure}}::h8f0c1ce2e4d76736
                               at src/lib.rs:22
  55:     0x55bffaa1a29e - core::ops::function::FnOnce::call_once::h87000749d8e71da0
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libcore/ops/function.rs:227
  56:     0x55bffab0ef6f - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h00c873bca1a9c24f
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/liballoc/boxed.rs:942
  57:     0x55bffae0e16a - __rust_maybe_catch_panic
                               at src/libpanic_unwind/lib.rs:78
  58:     0x55bffab2a54a - std::panicking::try::hdba8fea187b23218
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/panicking.rs:265
  59:     0x55bffab2a54a - std::panic::catch_unwind::h79cf5724e35ac29b
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/panic.rs:396
  60:     0x55bffab2a54a - test::run_test_in_process::he0809c1ca99bd533
                               at src/libtest/lib.rs:570
  61:     0x55bffab2a54a - test::run_test::run_test_inner::{{closure}}::h4b6fb7775e4f28a4
                               at src/libtest/lib.rs:473
  62:     0x55bffab037d6 - std::sys_common::backtrace::__rust_begin_short_backtrace::h8a4ab0cce014c58d
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/sys_common/backtrace.rs:129
  63:     0x55bffab07c26 - std::thread::Builder::spawn_unchecked::{{closure}}::{{closure}}::h4c8f05c33674d1dd
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/thread/mod.rs:469
  64:     0x55bffab07c26 - <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::hbbfd9cbdf3d7f06e
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/panic.rs:317
  65:     0x55bffab07c26 - std::panicking::try::do_call::h5e84c622d04edf76
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/panicking.rs:287
  66:     0x55bffae0e16a - __rust_maybe_catch_panic
                               at src/libpanic_unwind/lib.rs:78
  67:     0x55bffab08526 - std::panicking::try::hae6682d7ff031b34
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/panicking.rs:265
  68:     0x55bffab08526 - std::panic::catch_unwind::h9a1d5aab575ef96d
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/panic.rs:396
  69:     0x55bffab08526 - std::thread::Builder::spawn_unchecked::{{closure}}::h75a3197cbc80a47f
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libstd/thread/mod.rs:468
  70:     0x55bffab08526 - core::ops::function::FnOnce::call_once{{vtable.shim}}::hd2d480002dfcfc17
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/libcore/ops/function.rs:227
  71:     0x55bffadf8e5f - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h3534c64212330b0c
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/liballoc/boxed.rs:942
  72:     0x55bffae0d2e0 - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h338c10574a337ece
                               at /rustc/73528e339aae0f17a15ffa49a8ac608f50c6cf14/src/liballoc/boxed.rs:942
  73:     0x55bffae0d2e0 - std::sys_common::thread::start_thread::h761ac6d57710d65d
                               at src/libstd/sys_common/thread.rs:13
  74:     0x55bffae0d2e0 - std::sys::unix::thread::Thread::new::thread_start::h61c012ef60f933c0
                               at src/libstd/sys/unix/thread.rs:79
  75:     0x7f15d5bd4f27 - start_thread
                               at /builddir/glibc-2.30/nptl/pthread_create.c:479
  76:     0x7f15d5aebe0f - __GI___clone
  77:                0x0 - <unknown>