[INFO] cloning repository https://github.com/TeakWood/rust-collections
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/TeakWood/rust-collections" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTeakWood%2Frust-collections", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTeakWood%2Frust-collections'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5ff57ee143031d815f98f0bf7bd9e4e362b63564
[INFO] testing TeakWood/rust-collections against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTeakWood%2Frust-collections" "/workspace/builds/worker-10/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/TeakWood/rust-collections 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 git repo https://github.com/TeakWood/rust-collections
[INFO] finished tweaking git repo https://github.com/TeakWood/rust-collections
[INFO] tweaked toml for git repo https://github.com/TeakWood/rust-collections written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/TeakWood/rust-collections already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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] 99a5beadb15a0c32235d74d1bd4b2325a7efb266faabe4763ca3e36fa735f77c
[INFO] running `Command { std: "docker" "start" "-a" "99a5beadb15a0c32235d74d1bd4b2325a7efb266faabe4763ca3e36fa735f77c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "99a5beadb15a0c32235d74d1bd4b2325a7efb266faabe4763ca3e36fa735f77c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "99a5beadb15a0c32235d74d1bd4b2325a7efb266faabe4763ca3e36fa735f77c", kill_on_drop: false }`
[INFO] [stdout] 99a5beadb15a0c32235d74d1bd4b2325a7efb266faabe4763ca3e36fa735f77c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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] c5a3ea46ecf5e6a415e5d326e1e6d605d2c8af307e95d8fb5b42d7f223339a90
[INFO] running `Command { std: "docker" "start" "-a" "c5a3ea46ecf5e6a415e5d326e1e6d605d2c8af307e95d8fb5b42d7f223339a90", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_collections v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(box_into_raw_non_null)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no function or associated item named `into_raw_non_null` found for struct `Box<_, _>` in the current scope
[INFO] [stdout]   --> src/linkedlist.rs:51:24
[INFO] [stdout]    |
[INFO] [stdout] 51 |         let node = Some(Box::into_raw_non_null(node));
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^ function or associated item not found in `Box<_, _>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no function or associated item named `into_raw_non_null` found for struct `Box<_, _>` in the current scope
[INFO] [stdout]    --> src/linkedlist.rs:125:24
[INFO] [stdout]     |
[INFO] [stdout] 125 |         let node = Some(Box::into_raw_non_null(node));
[INFO] [stdout]     |                              ^^^^^^^^^^^^^^^^^ function or associated item not found in `Box<_, _>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_collections` due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "c5a3ea46ecf5e6a415e5d326e1e6d605d2c8af307e95d8fb5b42d7f223339a90", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c5a3ea46ecf5e6a415e5d326e1e6d605d2c8af307e95d8fb5b42d7f223339a90", kill_on_drop: false }`
[INFO] [stdout] c5a3ea46ecf5e6a415e5d326e1e6d605d2c8af307e95d8fb5b42d7f223339a90