[INFO] crate mantle-build 0.2.2 is already in cache
[INFO] checking mantle-build-0.2.2 against beta-2019-10-27 for pr-65897
[INFO] extracting crate mantle-build 0.2.2 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate mantle-build 0.2.2 on toolchain beta-2019-10-27
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2019-10-27" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate mantle-build 0.2.2
[INFO] finished tweaking crates.io crate mantle-build 0.2.2
[INFO] tweaked toml for crates.io crate mantle-build 0.2.2 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate crates.io crate mantle-build 0.2.2 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2019-10-27" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=allow" "-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-2019-10-27" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 18e2e6ec23f5dd0171dc289ed622caaf7b2cc22af34163532110bcf23006a9ab
[INFO] running `"docker" "start" "-a" "18e2e6ec23f5dd0171dc289ed622caaf7b2cc22af34163532110bcf23006a9ab"`
[INFO] [stderr]    Compiling syn v0.15.39
[INFO] [stderr]     Checking spin v0.5.0
[INFO] [stderr]    Compiling serde v1.0.94
[INFO] [stderr]    Compiling winapi v0.3.7
[INFO] [stderr]     Checking wasmparser v0.30.0
[INFO] [stderr]     Checking rgb v0.8.13
[INFO] [stderr]    Compiling regex v1.1.8
[INFO] [stderr]     Checking half v1.3.0
[INFO] [stderr]    Compiling compiletest_rs v0.3.22
[INFO] [stderr]     Checking blockchain-traits v0.2.0
[INFO] [stderr]    Compiling backtrace-sys v0.1.30
[INFO] [stderr]    Compiling rand_chacha v0.2.0
[INFO] [stderr]     Checking heck v0.3.1
[INFO] [stderr]     Checking getopts v0.2.19
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking quote v0.6.12
[INFO] [stderr]     Checking filetime v0.2.6
[INFO] [stderr]     Checking libflate v0.1.25
[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/blockchain-traits-0.2.0/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(non_exhaustive)]
[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 `blockchain-traits`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "18e2e6ec23f5dd0171dc289ed622caaf7b2cc22af34163532110bcf23006a9ab"`
[INFO] running `"docker" "rm" "-f" "18e2e6ec23f5dd0171dc289ed622caaf7b2cc22af34163532110bcf23006a9ab"`
[INFO] [stdout] 18e2e6ec23f5dd0171dc289ed622caaf7b2cc22af34163532110bcf23006a9ab