Fail to create redis pool with tokio 0.2 and nightly rust

[EMayej]

My environment:
code repository: https://github.com/EMayej/rs-bb8-redis
rust version: rustc 1.40.0-nightly (2477e2493 2019-11-04)

I tried to use bb8 with tokio 0.2, when I run the program, it reports

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: SpawnError { is_shutdown: true }', src/libcore/result.rs:1165:5

Below is the output of env RUST_BACKTRACE=full cargo run, it looks like stack 16 and 17 trigger the panic:

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: SpawnError { is_shutdown: true }', src/libcore/result.rs:1165:5
stack backtrace:
   0:        0x109205e45 - backtrace::backtrace::libunwind::trace::h8f761892b88f7dc8
                               at /Users/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/libunwind.rs:88
   1:        0x109205e45 - backtrace::backtrace::trace_unsynchronized::he51ab0165d85becb
                               at /Users/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/mod.rs:66
   2:        0x109205e45 - std::sys_common::backtrace::_print_fmt::hadaad98187d7cb07
                               at src/libstd/sys_common/backtrace.rs:77
   3:        0x109205e45 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h3c5a272958cd5a04
                               at src/libstd/sys_common/backtrace.rs:61
   4:        0x109220830 - core::fmt::write::hd88fffaf4bc6db48
                               at src/libcore/fmt/mod.rs:1028
   5:        0x109202f1b - std::io::Write::write_fmt::hce06fb5a3353c591
                               at src/libstd/io/mod.rs:1412
   6:        0x109207b83 - std::sys_common::backtrace::_print::h8eacc794e79f0359
                               at src/libstd/sys_common/backtrace.rs:65
   7:        0x109207b83 - std::sys_common::backtrace::print::h969a7cf78dc7e1fd
                               at src/libstd/sys_common/backtrace.rs:50
   8:        0x109207b83 - std::panicking::default_hook::{{closure}}::h847a58d309a7cea4
                               at src/libstd/panicking.rs:188
   9:        0x10920788a - std::panicking::default_hook::h0715616d08c05b60
                               at src/libstd/panicking.rs:205
  10:        0x1092082cb - std::panicking::rust_panic_with_hook::hc7409c536d0d6111
                               at src/libstd/panicking.rs:464
  11:        0x109207e29 - std::panicking::continue_panic_fmt::h2f41864899758f23
                               at src/libstd/panicking.rs:373
  12:        0x109207d29 - rust_begin_unwind
                               at src/libstd/panicking.rs:302
  13:        0x10921ddbc - core::panicking::panic_fmt::hb54121e5882c537a
                               at src/libcore/panicking.rs:139
  14:        0x10921de99 - core::result::unwrap_failed::h0591d7542260370e
                               at src/libcore/result.rs:1165
  15:        0x108f5b05a - core::result::Result<T,E>::unwrap::h733a06e0fd4fa49f
                               at /rustc/2477e2493e67527fc282c7239e019f7ebd513a1a/src/libcore/result.rs:933
  16:        0x108f4b331 - tokio_executor::global::spawn::hf155d52fa6070f70
                               at /Users/EMayej/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-executor-0.1.8/src/global.rs:165
  17:        0x108f4717c - bb8::Pool<M>::new_inner::hfcbe7c2a5fd92ff2
                               at /Users/EMayej/.cargo/git/checkouts/bb8-176170de965f79ee/0639389/src/lib.rs:664
  18:        0x108f4815f - bb8::Builder<M>::build_inner::hca668ca11028a991
                               at /Users/EMayej/.cargo/git/checkouts/bb8-176170de965f79ee/0639389/src/lib.rs:303
  19:        0x108f4830f - bb8::Builder<M>::build::hdbb6f0f1f6320636
                               at /Users/EMayej/.cargo/git/checkouts/bb8-176170de965f79ee/0639389/src/lib.rs:313
  20:        0x108f569e6 - rs_bb8_redis::main::{{closure}}::h26a0c37b0ce9128c
                               at src/main.rs:8
  21:        0x108f60ccf - <std::future::GenFuture<T> as core::future::future::Future>::poll::{{closure}}::hbab42c1f4be7221b
                               at /rustc/2477e2493e67527fc282c7239e019f7ebd513a1a/src/libstd/future.rs:43
  22:        0x108f60b37 - std::future::set_task_context::he6fbccfce8487124
                               at /rustc/2477e2493e67527fc282c7239e019f7ebd513a1a/src/libstd/future.rs:79
  23:        0x108f60c94 - <std::future::GenFuture<T> as core::future::future::Future>::poll::hcab46014fa3e0aa6
                               at /rustc/2477e2493e67527fc282c7239e019f7ebd513a1a/src/libstd/future.rs:43
  24:        0x108f55b52 - tokio_executor::enter::Enter::block_on::h6a3e2db7777c96d8
                               at /Users/EMayej/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-executor-0.2.0-alpha.6/src/enter.rs:118
  25:        0x108f4ae7b - tokio::runtime::threadpool::Runtime::block_on::{{closure}}::{{closure}}::h6d1a9e179b7dbcd8
                               at /Users/EMayej/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.2.0-alpha.6/src/runtime/threadpool/mod.rs:178
  26:        0x108f613c1 - tracing_core::dispatcher::with_default::hf64f07a03cb40aee
                               at /Users/EMayej/.cargo/registry/src/github.com-1ecc6299db9ec823/tracing-core-0.1.7/src/dispatcher.rs:226
  27:        0x108f4ad52 - tokio::runtime::threadpool::Runtime::block_on::{{closure}}::hce02d37d9193b599
                               at /Users/EMayej/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.2.0-alpha.6/src/runtime/threadpool/mod.rs:177
  28:        0x108f5735d - tokio_executor::global::with_default::{{closure}}::h309ebf8d3174d7eb
                               at /Users/EMayej/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-executor-0.2.0-alpha.6/src/global.rs:173
  29:        0x108f5cdff - std::thread::local::LocalKey<T>::try_with::h212b5914e2ac2f47
                               at /rustc/2477e2493e67527fc282c7239e019f7ebd513a1a/src/libstd/thread/local.rs:262
  30:        0x108f5cc28 - std::thread::local::LocalKey<T>::with::he0eef222b3d0f0d1
                               at /rustc/2477e2493e67527fc282c7239e019f7ebd513a1a/src/libstd/thread/local.rs:239
  31:        0x108f571c8 - tokio_executor::global::with_default::h8f93a710e16368ec
                               at /Users/EMayej/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-executor-0.2.0-alpha.6/src/global.rs:147
  32:        0x108f4abeb - tokio::runtime::threadpool::Runtime::block_on::h948ab96b64ca55a4
                               at /Users/EMayej/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.2.0-alpha.6/src/runtime/threadpool/mod.rs:174
  33:        0x108f4cfd6 - rs_bb8_redis::main::h0119947bfd362297
                               at src/main.rs:4
  34:        0x108f6c882 - std::rt::lang_start::{{closure}}::haafd5f87b1839333
                               at /rustc/2477e2493e67527fc282c7239e019f7ebd513a1a/src/libstd/rt.rs:61
  35:        0x109207ca8 - std::rt::lang_start_internal::{{closure}}::h59ed7b0d82d79ae9
                               at src/libstd/rt.rs:48
  36:        0x109207ca8 - std::panicking::try::do_call::h8bf384ff55799751
                               at src/libstd/panicking.rs:287
  37:        0x10920ab8f - __rust_maybe_catch_panic
                               at src/libpanic_unwind/lib.rs:78
  38:        0x10920865e - std::panicking::try::h31172b278baba0d3
                               at src/libstd/panicking.rs:265
  39:        0x10920865e - std::panic::catch_unwind::h4c69a67a533516a8
                               at src/libstd/panic.rs:396
  40:        0x10920865e - std::rt::lang_start_internal::h8b637dc44c57cd2d
                               at src/libstd/rt.rs:47
  41:        0x108f6c862 - std::rt::lang_start::h786ea050cfbeb1f9
                               at /rustc/2477e2493e67527fc282c7239e019f7ebd513a1a/src/libstd/rt.rs:61
  42:        0x108f4d042 - rs_bb8_redis::main::h0119947bfd362297

Is this because tokio-executor 0.1.8 (stack 16) is been used? How could I correctly use them (tokio 0.2 and bbs) together? Does this relate to #31?

Thank you.

[khuey]

Yeah, you can't use this library with tokio 0.2 yet.

Closing as a duplicate of #31.