[INFO] fetching crate skipchannel 2.0.1...
[INFO] testing skipchannel-2.0.1 against master#99e3aef02079e9c10583638520cd0c134dc3a01d for pr-85530
[INFO] extracting crate skipchannel 2.0.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate skipchannel 2.0.1 on toolchain 99e3aef02079e9c10583638520cd0c134dc3a01d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "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-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 00e9c52eaa4c3e7054b298c51b2961624dbfbbd1c7f28f37250e334ca553a646
[INFO] running `Command { std: "docker" "start" "-a" "00e9c52eaa4c3e7054b298c51b2961624dbfbbd1c7f28f37250e334ca553a646", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "00e9c52eaa4c3e7054b298c51b2961624dbfbbd1c7f28f37250e334ca553a646", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "00e9c52eaa4c3e7054b298c51b2961624dbfbbd1c7f28f37250e334ca553a646", kill_on_drop: false }`
[INFO] [stdout] 00e9c52eaa4c3e7054b298c51b2961624dbfbbd1c7f28f37250e334ca553a646
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d537edc81053f2e30faa90ebfca303758a738fdf7d6f6c99fa30eb1408dc054a
[INFO] running `Command { std: "docker" "start" "-a" "d537edc81053f2e30faa90ebfca303758a738fdf7d6f6c99fa30eb1408dc054a", kill_on_drop: false }`
[INFO] [stderr]    Compiling skipchannel v2.0.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.12s
[INFO] running `Command { std: "docker" "inspect" "d537edc81053f2e30faa90ebfca303758a738fdf7d6f6c99fa30eb1408dc054a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d537edc81053f2e30faa90ebfca303758a738fdf7d6f6c99fa30eb1408dc054a", kill_on_drop: false }`
[INFO] [stdout] d537edc81053f2e30faa90ebfca303758a738fdf7d6f6c99fa30eb1408dc054a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c3f87a8feafd560d0f98723ea7e9b56f43958122cde952df1c95478f66f73d81
[INFO] running `Command { std: "docker" "start" "-a" "c3f87a8feafd560d0f98723ea7e9b56f43958122cde952df1c95478f66f73d81", 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_panic)]` on by default
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[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 0.78s
[INFO] running `Command { std: "docker" "inspect" "c3f87a8feafd560d0f98723ea7e9b56f43958122cde952df1c95478f66f73d81", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c3f87a8feafd560d0f98723ea7e9b56f43958122cde952df1c95478f66f73d81", kill_on_drop: false }`
[INFO] [stdout] c3f87a8feafd560d0f98723ea7e9b56f43958122cde952df1c95478f66f73d81
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] ccf24ea9582b6304e4bff0840e447a49d4a36f20efe5f535043f7a6aae57cce8
[INFO] running `Command { std: "docker" "start" "-a" "ccf24ea9582b6304e4bff0840e447a49d4a36f20efe5f535043f7a6aae57cce8", 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_panic)]` on by default
[INFO] [stderr]     = note: this is no longer accepted in Rust 2021
[INFO] [stderr] help: add a "{}" format string to Display the message
[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: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/skipchannel-8d7b70456cf09175)
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests skipchannel
[INFO] [stdout] running 9 tests
[INFO] [stdout] test tests::skip_channel::allows_to_send_one_value ... ok
[INFO] [stdout] test tests::skip_channel::drop::does_not_drop_values_when_just_the_receiver_is_dropped ... ok
[INFO] [stdout] test tests::skip_channel::drop::value_is_dropped_when_sender_and_receiver_are_dropped ... ok
[INFO] [stdout] test tests::skip_channel::yields_none_when_nothing_is_sent ... ok
[INFO] [stdout] test tests::skip_channel::returns_none_when_a_sent_value_is_already_consumed ... ok
[INFO] [stdout] test tests::skip_channel::drop::drops_unconsumed_values_on_subsequent_sends ... 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::skips_all_values_but_the_last ... ok
[INFO] [stdout] test tests::skip_channel::allows_to_send_values_between_threads ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[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 0.50s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "ccf24ea9582b6304e4bff0840e447a49d4a36f20efe5f535043f7a6aae57cce8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ccf24ea9582b6304e4bff0840e447a49d4a36f20efe5f535043f7a6aae57cce8", kill_on_drop: false }`
[INFO] [stdout] ccf24ea9582b6304e4bff0840e447a49d4a36f20efe5f535043f7a6aae57cce8