[INFO] fetching crate basic_allocator 0.1.6...
[INFO] testing basic_allocator-0.1.6 against 1.45.2 for beta-1.46-1
[INFO] extracting crate basic_allocator 0.1.6 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate basic_allocator 0.1.6 on toolchain 1.45.2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate basic_allocator 0.1.6
[INFO] finished tweaking crates.io crate basic_allocator 0.1.6
[INFO] tweaked toml for crates.io crate basic_allocator 0.1.6 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate crates.io crate basic_allocator 0.1.6 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "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] 347eb98b679d23bf26baf568079e64eef957e4f7e78cd2d1ffceab9f3e33a403
[INFO] running `Command { std: "docker" "start" "-a" "347eb98b679d23bf26baf568079e64eef957e4f7e78cd2d1ffceab9f3e33a403", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "347eb98b679d23bf26baf568079e64eef957e4f7e78cd2d1ffceab9f3e33a403", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "347eb98b679d23bf26baf568079e64eef957e4f7e78cd2d1ffceab9f3e33a403", kill_on_drop: false }`
[INFO] [stdout] 347eb98b679d23bf26baf568079e64eef957e4f7e78cd2d1ffceab9f3e33a403
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 70945bf2cd6aa02d29544bbb4c9ce3f205ed760908ca1f50cfe90741a41d03c1
[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" "70945bf2cd6aa02d29544bbb4c9ce3f205ed760908ca1f50cfe90741a41d03c1", kill_on_drop: false }`
[INFO] [stderr]    Compiling static_assertions v1.1.0
[INFO] [stderr]    Compiling spin v0.5.2
[INFO] [stderr]    Compiling basic_allocator v0.1.6 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:40
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![cfg_attr(not(feature = "use_libc"), feature(asm))]
[INFO] [stdout]   |                                        ^^^^^^^^^^^^
[INFO] [stdout] 
[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 E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `basic_allocator`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "70945bf2cd6aa02d29544bbb4c9ce3f205ed760908ca1f50cfe90741a41d03c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "70945bf2cd6aa02d29544bbb4c9ce3f205ed760908ca1f50cfe90741a41d03c1", kill_on_drop: false }`
[INFO] [stdout] 70945bf2cd6aa02d29544bbb4c9ce3f205ed760908ca1f50cfe90741a41d03c1