[INFO] fetching crate railsgun 0.1.4...
[INFO] testing railsgun-0.1.4 against 1.55.0 for beta-1.56-1
[INFO] extracting crate railsgun 0.1.4 into /workspace/builds/worker-15/source
[INFO] validating manifest of crates.io crate railsgun 0.1.4 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate railsgun 0.1.4
[INFO] finished tweaking crates.io crate railsgun 0.1.4
[INFO] tweaked toml for crates.io crate railsgun 0.1.4 written to /workspace/builds/worker-15/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cbb5b4b0cea9ef422af5b001442a9e20ab94c3c1e7abca265cb09aca19fc3049
[INFO] running `Command { std: "docker" "start" "-a" "cbb5b4b0cea9ef422af5b001442a9e20ab94c3c1e7abca265cb09aca19fc3049", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cbb5b4b0cea9ef422af5b001442a9e20ab94c3c1e7abca265cb09aca19fc3049", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cbb5b4b0cea9ef422af5b001442a9e20ab94c3c1e7abca265cb09aca19fc3049", kill_on_drop: false }`
[INFO] [stdout] cbb5b4b0cea9ef422af5b001442a9e20ab94c3c1e7abca265cb09aca19fc3049
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2951d9bda339391e9f594026f1a4abaad956b332f0d0c14d8ce9b494c12db050
[INFO] running `Command { std: "docker" "start" "-a" "2951d9bda339391e9f594026f1a4abaad956b332f0d0c14d8ce9b494c12db050", kill_on_drop: false }`
[INFO] [stderr]    Compiling tokio v1.11.0
[INFO] [stderr]    Compiling tokio-macros v1.3.0
[INFO] [stderr]    Compiling railsgun v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]    --> src/lib.rs:165:1
[INFO] [stdout]     |
[INFO] [stdout] 165 | #[macro_use]
[INFO] [stdout]     | ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/async_result.rs:886:23
[INFO] [stdout]     |
[INFO] [stdout] 886 |             Err(_) => unsafe { hint::unreachable_unchecked() },
[INFO] [stdout]     |                       ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/async_result.rs:922:22
[INFO] [stdout]     |
[INFO] [stdout] 922 |             Ok(_) => unsafe { hint::unreachable_unchecked() },
[INFO] [stdout]     |                      ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.99s
[INFO] running `Command { std: "docker" "inspect" "2951d9bda339391e9f594026f1a4abaad956b332f0d0c14d8ce9b494c12db050", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2951d9bda339391e9f594026f1a4abaad956b332f0d0c14d8ce9b494c12db050", kill_on_drop: false }`
[INFO] [stdout] 2951d9bda339391e9f594026f1a4abaad956b332f0d0c14d8ce9b494c12db050
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9c2c056d1dcaccfe6561190389a700f6a4450a15608d79ccf12a0f84cb32e31b
[INFO] running `Command { std: "docker" "start" "-a" "9c2c056d1dcaccfe6561190389a700f6a4450a15608d79ccf12a0f84cb32e31b", kill_on_drop: false }`
[INFO] [stderr]    Compiling railsgun v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]    --> src/lib.rs:165:1
[INFO] [stdout]     |
[INFO] [stdout] 165 | #[macro_use]
[INFO] [stdout]     | ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/async_result.rs:886:23
[INFO] [stdout]     |
[INFO] [stdout] 886 |             Err(_) => unsafe { hint::unreachable_unchecked() },
[INFO] [stdout]     |                       ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/async_result.rs:922:22
[INFO] [stdout]     |
[INFO] [stdout] 922 |             Ok(_) => unsafe { hint::unreachable_unchecked() },
[INFO] [stdout]     |                      ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]    --> src/lib.rs:165:1
[INFO] [stdout]     |
[INFO] [stdout] 165 | #[macro_use]
[INFO] [stdout]     | ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]     --> src/async_result.rs:1842:35
[INFO] [stdout]      |
[INFO] [stdout] 1842 |         assert_eq!(x.map_or_else(|e| k * 2, |v| v.len()), 3);
[INFO] [stdout]      |                                   ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]     --> src/async_result.rs:1845:35
[INFO] [stdout]      |
[INFO] [stdout] 1845 |         assert_eq!(x.map_or_else(|e| k * 2, |v| v.len()), 42);
[INFO] [stdout]      |                                   ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/async_result.rs:886:23
[INFO] [stdout]     |
[INFO] [stdout] 886 |             Err(_) => unsafe { hint::unreachable_unchecked() },
[INFO] [stdout]     |                       ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/async_result.rs:922:22
[INFO] [stdout]     |
[INFO] [stdout] 922 |             Ok(_) => unsafe { hint::unreachable_unchecked() },
[INFO] [stdout]     |                      ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 3.96s
[INFO] running `Command { std: "docker" "inspect" "9c2c056d1dcaccfe6561190389a700f6a4450a15608d79ccf12a0f84cb32e31b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9c2c056d1dcaccfe6561190389a700f6a4450a15608d79ccf12a0f84cb32e31b", kill_on_drop: false }`
[INFO] [stdout] 9c2c056d1dcaccfe6561190389a700f6a4450a15608d79ccf12a0f84cb32e31b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] c17c18036469f663803339b71bedb969544ecc3ec8510bb9ead0abe932e3addb
[INFO] running `Command { std: "docker" "start" "-a" "c17c18036469f663803339b71bedb969544ecc3ec8510bb9ead0abe932e3addb", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stdout] running 48 tests
[INFO] [stderr]    --> src/lib.rs:165:1
[INFO] [stderr]     |
[INFO] [stderr] 165 | #[macro_use]
[INFO] [stderr]     | ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]    --> src/async_result.rs:886:23
[INFO] [stderr]     |
[INFO] [stderr] 886 |             Err(_) => unsafe { hint::unreachable_unchecked() },
[INFO] [stderr]     |                       ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]    --> src/async_result.rs:922:22
[INFO] [stderr]     |
[INFO] [stderr] 922 |             Ok(_) => unsafe { hint::unreachable_unchecked() },
[INFO] [stderr]     |                      ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]     --> src/async_result.rs:1842:35
[INFO] [stderr]      |
[INFO] [stderr] 1842 |         assert_eq!(x.map_or_else(|e| k * 2, |v| v.len()), 3);
[INFO] [stderr]      |                                   ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stderr]      |
[INFO] [stderr]      = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]     --> src/async_result.rs:1845:35
[INFO] [stderr]      |
[INFO] [stderr] 1845 |         assert_eq!(x.map_or_else(|e| k * 2, |v| v.len()), 42);
[INFO] [stderr]      |                                   ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stderr] 
[INFO] [stderr] warning: `railsgun` (lib) generated 3 warnings
[INFO] [stderr] warning: `railsgun` (lib test) generated 5 warnings (3 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/railsgun-4d77dcad734b874a)
[INFO] [stdout] test async_result::test::cloned ... ok
[INFO] [stdout] test async_result::test::cloned_mut ... ok
[INFO] [stdout] test async_result::test::async_map ... ok
[INFO] [stdout] test async_result::test::async_and_then ... ok
[INFO] [stdout] test async_result::test::as_mut ... ok
[INFO] [stdout] test async_result::test::contains_err ... ok
[INFO] [stdout] test async_result::test::and_then ... ok
[INFO] [stdout] test async_result::test::async_map_or ... ok
[INFO] [stdout] test async_result::test::async_map_err ... ok
[INFO] [stdout] test async_result::test::and ... ok
[INFO] [stdout] test async_result::test::as_ref ... ok
[INFO] [stdout] test async_result::test::contains ... ok
[INFO] [stdout] test async_result::test::async_or_else ... ok
[INFO] [stdout] test async_result::test::async_unwrap_or_else ... ok
[INFO] [stdout] test async_result::test::copied ... ok
[INFO] [stdout] test async_result::test::test_flatten_level_2 ... ok
[INFO] [stdout] test async_result::test::test_into_iter ... ok
[INFO] [stdout] test async_result::test::test_into_ok_or_err ... ok
[INFO] [stdout] test async_result::test::test_transpose ... ok
[INFO] [stdout] test async_result::test::unwrap_or ... ok
[INFO] [stdout] test async_result::test::unwrap_or_else ... ok
[INFO] [stdout] test async_result::test::unwrap_or_default ... ok
[INFO] [stdout] test async_result::test::unwrap_unchecked ... ok
[INFO] [stdout] test async_result::test::iter_mut ... ok
[INFO] [stdout] test async_result::test::test_as_deref ... ok
[INFO] [stdout] test async_result::test::or_else ... ok
[INFO] [stdout] test async_result::test::map_or ... ok
[INFO] [stdout] test async_result::test::is_ok ... ok
[INFO] [stdout] test async_result::test::unwrap ... ok
[INFO] [stdout] test async_result::test::unwrap_err ... ok
[INFO] [stdout] test async_result::test::err ... ok
[INFO] [stdout] test async_result::test::map_err ... ok
[INFO] [stdout] test async_result::test::test_as_deref_mut ... ok
[INFO] [stdout] test async_result::test::is_err ... ok
[INFO] [stdout] test async_result::test::ok ... ok
[INFO] [stdout] test async_result::test::copied_mut ... ok
[INFO] [stdout] test async_result::test::iter ... ok
[INFO] [stdout] test async_result::test::test_flatten_level_1 ... ok
[INFO] [stdout] test async_result::test::unwrap_err_unchecked ... ok
[INFO] [stdout] test async_result::test::or ... ok
[INFO] [stdout] test async_result::test::map_or_else ... ok
[INFO] [stdout] test async_result::test::map ... ok
[INFO] [stderr]    Doc-tests railsgun
[INFO] [stdout] test async_result::test::unwrap_panic - should panic ... ok
[INFO] [stdout] test async_result::test::expect - should panic ... ok
[INFO] [stdout] test async_result::test::unwrap_err_unchecked_no_run - should panic ... ok
[INFO] [stdout] test async_result::test::expect_err_panic - should panic ... ok
[INFO] [stdout] test async_result::test::unwrap_unchecked_no_run - should panic ... ok
[INFO] [stdout] test async_result::test::unwrap_err_panic - should panic ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 48 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.09s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 95 tests
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name railsgun --test /opt/rustwide/workdir/src/lib.rs -L dependency=/opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern railsgun=/opt/rustwide/target/debug/deps/librailsgun-344fc74e48efadf7.rlib --extern tokio=/opt/rustwide/target/debug/deps/libtokio-6ae5e84ad0faa686.rlib -C embed-bitcode=no --error-format human` (signal: 9, SIGKILL: kill)
[INFO] running `Command { std: "docker" "inspect" "c17c18036469f663803339b71bedb969544ecc3ec8510bb9ead0abe932e3addb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c17c18036469f663803339b71bedb969544ecc3ec8510bb9ead0abe932e3addb", kill_on_drop: false }`
[INFO] [stdout] c17c18036469f663803339b71bedb969544ecc3ec8510bb9ead0abe932e3addb