[INFO] crate alloc_system 0.1.2 is already in cache
[INFO] testing alloc_system-0.1.2 against beta-2020-06-03 for beta-1.45-1
[INFO] extracting crate alloc_system 0.1.2 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate alloc_system 0.1.2 on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate alloc_system 0.1.2
[INFO] finished tweaking crates.io crate alloc_system 0.1.2
[INFO] tweaked toml for crates.io crate alloc_system 0.1.2 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 7c3a8b5e1d0baeedd12b2a5eb0a1fd8df91687212373c172db8ae2b3d64b8db1
[INFO] running `"docker" "start" "-a" "7c3a8b5e1d0baeedd12b2a5eb0a1fd8df91687212373c172db8ae2b3d64b8db1"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling alloc_system v0.1.2 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0557]: feature has been removed
[INFO] [stderr]  --> src/lib.rs:4:12
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![feature(allocator)]
[INFO] [stderr]   |            ^^^^^^^^^ feature has been removed
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: non-builtin inner attributes are unstable
[INFO] [stderr]  --> src/lib.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![allocator]
[INFO] [stderr]   | ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: see issue #54726 <https://github.com/rust-lang/rust/issues/54726> for more information
[INFO] [stderr] 
[INFO] [stderr] error: cannot find attribute `allocator` in this scope
[INFO] [stderr]  --> src/lib.rs:3:4
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![allocator]
[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(lang_items)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![feature(allocator)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 5 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0557, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `alloc_system`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "7c3a8b5e1d0baeedd12b2a5eb0a1fd8df91687212373c172db8ae2b3d64b8db1"`
[INFO] running `"docker" "rm" "-f" "7c3a8b5e1d0baeedd12b2a5eb0a1fd8df91687212373c172db8ae2b3d64b8db1"`
[INFO] [stdout] 7c3a8b5e1d0baeedd12b2a5eb0a1fd8df91687212373c172db8ae2b3d64b8db1