[INFO] fetching crate skipchannel 2.0.1...
[INFO] testing skipchannel-2.0.1 against try#722e1797249a965b6335aebd65d777f917e498f1 for pr-91031
[INFO] extracting crate skipchannel 2.0.1 into /workspace/builds/worker-17/source
[INFO] validating manifest of crates.io crate skipchannel 2.0.1 on toolchain 722e1797249a965b6335aebd65d777f917e498f1
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate skipchannel 2.0.1
[INFO] finished tweaking crates.io crate skipchannel 2.0.1
[INFO] tweaked toml for crates.io crate skipchannel 2.0.1 written to /workspace/builds/worker-17/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-17/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-17/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 62da5b48417e0b1b3eee606648021f5c454396438b637915fcc3294865893015
[INFO] running `Command { std: "docker" "start" "-a" "62da5b48417e0b1b3eee606648021f5c454396438b637915fcc3294865893015", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "62da5b48417e0b1b3eee606648021f5c454396438b637915fcc3294865893015", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "62da5b48417e0b1b3eee606648021f5c454396438b637915fcc3294865893015", kill_on_drop: false }`
[INFO] [stdout] 62da5b48417e0b1b3eee606648021f5c454396438b637915fcc3294865893015
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-17/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-17/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 99074e96943c39dc26c3c35b0c9f5408a633c8a0b381c7fe6d034bf477f2429f
[INFO] running `Command { std: "docker" "start" "-a" "99074e96943c39dc26c3c35b0c9f5408a633c8a0b381c7fe6d034bf477f2429f", kill_on_drop: false }`
[INFO] [stderr]    Compiling skipchannel v2.0.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.16s
[INFO] running `Command { std: "docker" "inspect" "99074e96943c39dc26c3c35b0c9f5408a633c8a0b381c7fe6d034bf477f2429f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "99074e96943c39dc26c3c35b0c9f5408a633c8a0b381c7fe6d034bf477f2429f", kill_on_drop: false }`
[INFO] [stdout] 99074e96943c39dc26c3c35b0c9f5408a633c8a0b381c7fe6d034bf477f2429f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-17/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-17/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 23ccd148b63e19490506867755e370c59899b4adce7a58bf7ec6474ee6c1c4f7
[INFO] running `Command { std: "docker" "start" "-a" "23ccd148b63e19490506867755e370c59899b4adce7a58bf7ec6474ee6c1c4f7", kill_on_drop: false }`
[INFO] [stderr]    Compiling skipchannel v2.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/lib.rs:105:36
[INFO] [stdout]     |
[INFO] [stdout] 105 |                 Err(err) => panic!(err),
[INFO] [stdout]     |                                    ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout]     = note: this usage of panic!() is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout] help: add a "{:?}" format string to use the Debug implementation of `Box<dyn Any + Send>`
[INFO] [stdout]     |
[INFO] [stdout] 105 |                 Err(err) => panic!("{:?}", err),
[INFO] [stdout]     |                                    +++++++
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]     |
[INFO] [stdout] 105 |                 Err(err) => std::panic::panic_any(err),
[INFO] [stdout]     |                             ~~~~~~~~~~~~~~~~~~~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.30s
[INFO] running `Command { std: "docker" "inspect" "23ccd148b63e19490506867755e370c59899b4adce7a58bf7ec6474ee6c1c4f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "23ccd148b63e19490506867755e370c59899b4adce7a58bf7ec6474ee6c1c4f7", kill_on_drop: false }`
[INFO] [stdout] 23ccd148b63e19490506867755e370c59899b4adce7a58bf7ec6474ee6c1c4f7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-17/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-17/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] d0757057fa1caced8e7d26f153279366068ceee488c49cafc50373162b0bb83e
[INFO] running `Command { std: "docker" "start" "-a" "d0757057fa1caced8e7d26f153279366068ceee488c49cafc50373162b0bb83e", kill_on_drop: false }`
[INFO] [stderr] warning: panic message is not a string literal
[INFO] [stderr]    --> src/lib.rs:105:36
[INFO] [stderr]     |
[INFO] [stderr] 105 |                 Err(err) => panic!(err),
[INFO] [stderr]     |                                    ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stderr]     = note: this usage of panic!() is deprecated; it will be a hard error in Rust 2021
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stderr] help: add a "{:?}" format string to use the Debug implementation of `Box<dyn Any + Send>`
[INFO] [stderr]     |
[INFO] [stderr] 105 |                 Err(err) => panic!("{:?}", err),
[INFO] [stderr]     |                                    +++++++
[INFO] [stderr] help: or use std::panic::panic_any instead
[INFO] [stderr]     |
[INFO] [stderr] 105 |                 Err(err) => std::panic::panic_any(err),
[INFO] [stderr]     |                             ~~~~~~~~~~~~~~~~~~~~~
[INFO] [stderr] 
[INFO] [stderr] warning: `skipchannel` (lib test) generated 1 warning
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/skipchannel-c9adf6dfa005f132)
[INFO] [stdout] 
[INFO] [stdout] running 9 tests
[INFO] [stdout] test tests::skip_channel::allows_to_send_one_value ... ok
[INFO] [stderr]    Doc-tests skipchannel
[INFO] [stdout] test tests::skip_channel::drop::does_not_drop_values_when_just_the_receiver_is_dropped ... ok
[INFO] [stdout] test tests::skip_channel::allows_to_send_values_between_threads ... ok
[INFO] [stdout] test tests::skip_channel::drop::does_not_drop_values_when_just_the_sender_is_dropped ... ok
[INFO] [stdout] test tests::skip_channel::drop::drops_unconsumed_values_on_subsequent_sends ... ok
[INFO] [stdout] test tests::skip_channel::drop::value_is_dropped_when_sender_and_receiver_are_dropped ... ok
[INFO] [stdout] test tests::skip_channel::returns_none_when_a_sent_value_is_already_consumed ... ok
[INFO] [stdout] test tests::skip_channel::yields_none_when_nothing_is_sent ... ok
[INFO] [stdout] test tests::skip_channel::skips_all_values_but_the_last ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/lib.rs - (line 10) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.58s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "d0757057fa1caced8e7d26f153279366068ceee488c49cafc50373162b0bb83e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d0757057fa1caced8e7d26f153279366068ceee488c49cafc50373162b0bb83e", kill_on_drop: false }`
[INFO] [stdout] d0757057fa1caced8e7d26f153279366068ceee488c49cafc50373162b0bb83e