[INFO] fetching crate basic_allocator 0.1.6...
[INFO] testing basic_allocator-0.1.6 against 1.54.0 for beta-1.55-1
[INFO] extracting crate basic_allocator 0.1.6 into /workspace/builds/worker-95/source
[INFO] validating manifest of crates.io crate basic_allocator 0.1.6 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", 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-95/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" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2726bf07d27e036847a746eb2d5c2d2a13f8d91d473f380cf657a36b309b0d20
[INFO] running `Command { std: "docker" "start" "-a" "2726bf07d27e036847a746eb2d5c2d2a13f8d91d473f380cf657a36b309b0d20", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2726bf07d27e036847a746eb2d5c2d2a13f8d91d473f380cf657a36b309b0d20", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2726bf07d27e036847a746eb2d5c2d2a13f8d91d473f380cf657a36b309b0d20", kill_on_drop: false }`
[INFO] [stdout] 2726bf07d27e036847a746eb2d5c2d2a13f8d91d473f380cf657a36b309b0d20
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] deb5c3ee6f44403ad95f160f5946a9981c120d9d0128f3e1ade0d501e35272c9
[INFO] running `Command { std: "docker" "start" "-a" "deb5c3ee6f44403ad95f160f5946a9981c120d9d0128f3e1ade0d501e35272c9", 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] warning: use of deprecated function `core::sync::atomic::spin_loop_hint`: use hint::spin_loop instead
[INFO] [stdout]    --> src/allocators.rs:365:13
[INFO] [stdout]     |
[INFO] [stdout] 365 |             core::sync::atomic::spin_loop_hint();
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `core::sync::atomic::AtomicU8::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stdout]    --> src/allocators.rs:347:35
[INFO] [stdout]     |
[INFO] [stdout] 347 |         let mut state = self.init.compare_and_swap(0, 1, Ordering::SeqCst);
[INFO] [stdout]     |                                   ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `basic_allocator`
[INFO] [stdout] error: aborting due to previous error; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "deb5c3ee6f44403ad95f160f5946a9981c120d9d0128f3e1ade0d501e35272c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "deb5c3ee6f44403ad95f160f5946a9981c120d9d0128f3e1ade0d501e35272c9", kill_on_drop: false }`
[INFO] [stdout] deb5c3ee6f44403ad95f160f5946a9981c120d9d0128f3e1ade0d501e35272c9
