[INFO] fetching crate oursh 0.2.0...
[INFO] testing oursh-0.2.0 against 1.49.0 for beta-1.50-1
[INFO] extracting crate oursh 0.2.0 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate oursh 0.2.0 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate oursh 0.2.0
[INFO] finished tweaking crates.io crate oursh 0.2.0
[INFO] tweaked toml for crates.io crate oursh 0.2.0 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 36d77cf1a5ce366361ef0ae5fa468440306db359f8c60214fdfc94e0e9ccfeb1
[INFO] running `Command { std: "docker" "start" "-a" "36d77cf1a5ce366361ef0ae5fa468440306db359f8c60214fdfc94e0e9ccfeb1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "36d77cf1a5ce366361ef0ae5fa468440306db359f8c60214fdfc94e0e9ccfeb1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "36d77cf1a5ce366361ef0ae5fa468440306db359f8c60214fdfc94e0e9ccfeb1", kill_on_drop: false }`
[INFO] [stdout] 36d77cf1a5ce366361ef0ae5fa468440306db359f8c60214fdfc94e0e9ccfeb1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] da53ae9f99033b754cf1e42e6423662d5b6a13dc626464ffd0651124f6a7a784
[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" "da53ae9f99033b754cf1e42e6423662d5b6a13dc626464ffd0651124f6a7a784", kill_on_drop: false }`
[INFO] [stderr]    Compiling lalrpop-util v0.16.3
[INFO] [stderr]    Compiling numtoa v0.1.0
[INFO] [stderr]    Compiling utf8 v0.0.2
[INFO] [stderr]    Compiling ena v0.11.0
[INFO] [stderr]    Compiling docopt v1.1.0
[INFO] [stderr]    Compiling docopt v0.8.3
[INFO] [stderr]    Compiling pwd v1.3.0
[INFO] [stderr]    Compiling string_cache v0.7.5
[INFO] [stderr]    Compiling termion v1.5.5
[INFO] [stderr]    Compiling lalrpop v0.16.3
[INFO] [stderr]    Compiling oursh v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:77:1
[INFO] [stdout]    |
[INFO] [stdout] 77 | #![feature(alloc_system, box_syntax, box_patterns)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]     --> /opt/rustwide/target/debug/build/oursh-8ea790e7f0bf0e1f/out/program/posix.rs:1589:5
[INFO] [stdout]      |
[INFO] [stdout] 1589 |     (__0)
[INFO] [stdout]      |     ^^^^^ help: remove these parentheses
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `oursh`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "da53ae9f99033b754cf1e42e6423662d5b6a13dc626464ffd0651124f6a7a784", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "da53ae9f99033b754cf1e42e6423662d5b6a13dc626464ffd0651124f6a7a784", kill_on_drop: false }`
[INFO] [stdout] da53ae9f99033b754cf1e42e6423662d5b6a13dc626464ffd0651124f6a7a784