[INFO] fetching crate xfast 0.1.0...
[INFO] testing xfast-0.1.0 against 1.47.0 for beta-1.48-1
[INFO] extracting crate xfast 0.1.0 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate xfast 0.1.0 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate xfast 0.1.0
[INFO] finished tweaking crates.io crate xfast 0.1.0
[INFO] tweaked toml for crates.io crate xfast 0.1.0 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6ab553df8d8270611487b223df7b1e6830e9395f05ee8639148866654ac4811d
[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" "6ab553df8d8270611487b223df7b1e6830e9395f05ee8639148866654ac4811d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6ab553df8d8270611487b223df7b1e6830e9395f05ee8639148866654ac4811d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ab553df8d8270611487b223df7b1e6830e9395f05ee8639148866654ac4811d", kill_on_drop: false }`
[INFO] [stdout] 6ab553df8d8270611487b223df7b1e6830e9395f05ee8639148866654ac4811d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fd741730189e03636cfde37fcc4120e043792364c16c2e608a7758377f2de31b
[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" "fd741730189e03636cfde37fcc4120e043792364c16c2e608a7758377f2de31b", kill_on_drop: false }`
[INFO] [stderr]    Compiling xfast 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[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(map_get_key_value)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no function or associated item named `into_raw_non_null` found for struct `std::boxed::Box<_>` in the current scope
[INFO] [stdout]    --> src/lib.rs:150:30
[INFO] [stdout]     |
[INFO] [stdout] 150 |         let root_node = Box::into_raw_non_null(root_node);
[INFO] [stdout]     |                              ^^^^^^^^^^^^^^^^^ function or associated item not found in `std::boxed::Box<_>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no function or associated item named `into_raw_non_null` found for struct `std::boxed::Box<_>` in the current scope
[INFO] [stdout]    --> src/lib.rs:336:38
[INFO] [stdout]     |
[INFO] [stdout] 336 |                 let temp_node = Box::into_raw_non_null(temp_node);
[INFO] [stdout]     |                                      ^^^^^^^^^^^^^^^^^ function or associated item not found in `std::boxed::Box<_>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no function or associated item named `into_raw_non_null` found for struct `std::boxed::Box<_>` in the current scope
[INFO] [stdout]    --> src/lib.rs:432:34
[INFO] [stdout]     |
[INFO] [stdout] 432 |         let new_node = Some(Box::into_raw_non_null(new_node));
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^^^ function or associated item not found in `std::boxed::Box<_>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 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 `xfast`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "fd741730189e03636cfde37fcc4120e043792364c16c2e608a7758377f2de31b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd741730189e03636cfde37fcc4120e043792364c16c2e608a7758377f2de31b", kill_on_drop: false }`
[INFO] [stdout] fd741730189e03636cfde37fcc4120e043792364c16c2e608a7758377f2de31b
