[INFO] crate buddy_system_allocator 0.3.5 is already in cache
[INFO] testing buddy_system_allocator-0.3.5 against beta-2019-09-28 for beta-1.39-1
[INFO] extracting crate buddy_system_allocator 0.3.5 into work/builds/worker-1/source
[INFO] validating manifest of crates.io crate buddy_system_allocator 0.3.5 on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate buddy_system_allocator 0.3.5
[INFO] finished tweaking crates.io crate buddy_system_allocator 0.3.5
[INFO] tweaked toml for crates.io crate buddy_system_allocator 0.3.5 written to work/builds/worker-1/source/Cargo.toml
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] 9c8234470d6d8b9b20ad52c2b7df42327adde8f31093822281c16e95a65c180b
[INFO] running `"docker" "start" "-a" "9c8234470d6d8b9b20ad52c2b7df42327adde8f31093822281c16e95a65c180b"`
[INFO] [stderr]    Compiling buddy_system_allocator v0.3.5 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(const_fn)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(alloc, allocator_api)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `alloc::boxed::Box`
[INFO] [stderr]    --> src/lib.rs:267:5
[INFO] [stderr]     |
[INFO] [stderr] 267 | use alloc::boxed::Box;
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `buddy_system_allocator`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "9c8234470d6d8b9b20ad52c2b7df42327adde8f31093822281c16e95a65c180b"`
[INFO] running `"docker" "rm" "-f" "9c8234470d6d8b9b20ad52c2b7df42327adde8f31093822281c16e95a65c180b"`
[INFO] [stdout] 9c8234470d6d8b9b20ad52c2b7df42327adde8f31093822281c16e95a65c180b