[INFO] cloning repository https://github.com/nirya-istari/dumb_os
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nirya-istari/dumb_os" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnirya-istari%2Fdumb_os", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnirya-istari%2Fdumb_os'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 920387fa8d188a942eebabcea78ac4c61a75d374
[INFO] checking nirya-istari/dumb_os against try#45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4 for pr-83744
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnirya-istari%2Fdumb_os" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/nirya-istari/dumb_os on toolchain 45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/nirya-istari/dumb_os
[INFO] removed 0 missing tests
[INFO] finished tweaking git repo https://github.com/nirya-istari/dumb_os
[INFO] tweaked toml for git repo https://github.com/nirya-istari/dumb_os written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/nirya-istari/dumb_os already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cdc9e9df43dd4ea73f45fb356f7ff99b20f5a533bf4bca088ed27bcda083c967
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "cdc9e9df43dd4ea73f45fb356f7ff99b20f5a533bf4bca088ed27bcda083c967", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cdc9e9df43dd4ea73f45fb356f7ff99b20f5a533bf4bca088ed27bcda083c967", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cdc9e9df43dd4ea73f45fb356f7ff99b20f5a533bf4bca088ed27bcda083c967", kill_on_drop: false }`
[INFO] [stdout] cdc9e9df43dd4ea73f45fb356f7ff99b20f5a533bf4bca088ed27bcda083c967
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bc76b2254c0fa040fe0d2920a512f1ecc83bf4f211b8e1a4014b9cd972ed4ee3
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "bc76b2254c0fa040fe0d2920a512f1ecc83bf4f211b8e1a4014b9cd972ed4ee3", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.68
[INFO] [stderr]    Compiling proc-macro-nested v0.1.7
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling x86_64 v0.13.2
[INFO] [stderr]     Checking futures-sink v0.3.13
[INFO] [stderr]     Checking futures-core v0.3.13
[INFO] [stderr]    Compiling bootloader v0.9.14
[INFO] [stderr]     Checking futures-task v0.3.13
[INFO] [stderr]     Checking pin-project-lite v0.2.6
[INFO] [stderr]     Checking bit_field v0.9.0
[INFO] [stderr]     Checking rand_core v0.6.2
[INFO] [stderr]     Checking cpuio v0.3.0
[INFO] [stderr]     Checking futures-io v0.3.13
[INFO] [stderr]     Checking spin v0.5.2
[INFO] [stderr]     Checking conquer-util v0.3.0
[INFO] [stderr]     Checking pc-keyboard v0.5.1
[INFO] [stderr]     Checking volatile v0.2.7
[INFO] [stderr]    Compiling crossbeam-utils v0.8.3
[INFO] [stderr]    Compiling memoffset v0.6.3
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stderr]     Checking conquer-once v0.3.2
[INFO] [stderr]     Checking pic8259_simple v0.2.0
[INFO] [stderr]     Checking rand_pcg v0.3.0
[INFO] [stderr]     Checking rand v0.8.3
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking futures-channel v0.3.13
[INFO] [stderr]     Checking spinning_top v0.1.1
[INFO] [stderr]     Checking linked_list_allocator v0.8.11
[INFO] [stderr]     Checking crossbeam-queue v0.3.1
[INFO] [stderr]     Checking crossbeam-epoch v0.9.3
[INFO] [stderr]     Checking crossbeam v0.8.0
[INFO] [stderr]     Checking uart_16550 v0.2.12
[INFO] [stderr]    Compiling futures-macro v0.3.13
[INFO] [stderr]     Checking futures-util v0.3.13
[INFO] [stderr]     Checking futures v0.3.13
[INFO] [stderr]     Checking dumb_os v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: language item required, but not found: `eh_personality`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `expect_none` found for enum `Option<Task>` in the current scope
[INFO] [stdout]   --> src/tasks/executor.rs:30:14
[INFO] [stdout]    |
[INFO] [stdout] 30 |             .expect_none("Task already spawned");
[INFO] [stdout]    |              ^^^^^^^^^^^ method not found in `Option<Task>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `expect_none` found for enum `Option<Task>` in the current scope
[INFO] [stdout]   --> src/tasks/executor.rs:30:14
[INFO] [stdout]    |
[INFO] [stdout] 30 |             .expect_none("Task already spawned");
[INFO] [stdout]    |              ^^^^^^^^^^^ method not found in `Option<Task>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `dumb_os`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "bc76b2254c0fa040fe0d2920a512f1ecc83bf4f211b8e1a4014b9cd972ed4ee3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bc76b2254c0fa040fe0d2920a512f1ecc83bf4f211b8e1a4014b9cd972ed4ee3", kill_on_drop: false }`
[INFO] [stdout] bc76b2254c0fa040fe0d2920a512f1ecc83bf4f211b8e1a4014b9cd972ed4ee3