[INFO] crate ralloc 1.0.0 is already in cache
[INFO] testing ralloc-1.0.0 against beta-2019-09-28 for beta-1.39-1
[INFO] extracting crate ralloc 1.0.0 into work/builds/worker-7/source
[INFO] validating manifest of crates.io crate ralloc 1.0.0 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 ralloc 1.0.0
[INFO] finished tweaking crates.io crate ralloc 1.0.0
[INFO] tweaked toml for crates.io crate ralloc 1.0.0 written to work/builds/worker-7/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-7/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-7/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] 38733599fca3e5bc80e5ca579a63f4420f83d100bc01149f40063f6eb50c7f32
[INFO] running `"docker" "start" "-a" "38733599fca3e5bc80e5ca579a63f4420f83d100bc01149f40063f6eb50c7f32"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling quine-mc_cluskey v0.2.4
[INFO] [stderr]    Compiling syscall v0.2.1
[INFO] [stderr]    Compiling unborrow v0.3.1
[INFO] [stderr]    Compiling semver v0.2.3
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/syscall-0.2.1/src/lib.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | #![feature(asm)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `syscall`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "38733599fca3e5bc80e5ca579a63f4420f83d100bc01149f40063f6eb50c7f32"`
[INFO] running `"docker" "rm" "-f" "38733599fca3e5bc80e5ca579a63f4420f83d100bc01149f40063f6eb50c7f32"`
[INFO] [stdout] 38733599fca3e5bc80e5ca579a63f4420f83d100bc01149f40063f6eb50c7f32