[INFO] fetching crate powhasher 0.2.2...
[INFO] testing powhasher-0.2.2 against 1.49.0 for beta-1.50-1
[INFO] extracting crate powhasher 0.2.2 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate powhasher 0.2.2 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate powhasher 0.2.2
[INFO] finished tweaking crates.io crate powhasher 0.2.2
[INFO] tweaked toml for crates.io crate powhasher 0.2.2 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 015c1a520b7e25c8e2f10fc43fc4a4a5a40d964168bbe8b2bd6bdead0da43c04
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "015c1a520b7e25c8e2f10fc43fc4a4a5a40d964168bbe8b2bd6bdead0da43c04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "015c1a520b7e25c8e2f10fc43fc4a4a5a40d964168bbe8b2bd6bdead0da43c04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "015c1a520b7e25c8e2f10fc43fc4a4a5a40d964168bbe8b2bd6bdead0da43c04", kill_on_drop: false }`
[INFO] [stdout] 015c1a520b7e25c8e2f10fc43fc4a4a5a40d964168bbe8b2bd6bdead0da43c04
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4cf800173cf5ff1c65743379965330fc7dc53474f73236e4458777a35defc5df
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "4cf800173cf5ff1c65743379965330fc7dc53474f73236e4458777a35defc5df", kill_on_drop: false }`
[INFO] [stderr]    Compiling byte-tools v0.3.1
[INFO] [stderr]    Compiling proc-macro-hack-impl v0.4.2
[INFO] [stderr]    Compiling crypto-simd v0.1.1
[INFO] [stderr]    Compiling arrayvec v0.4.12
[INFO] [stderr]    Compiling opaque-debug v0.2.3
[INFO] [stderr]    Compiling keccak v0.1.0
[INFO] [stderr]    Compiling typenum v1.12.0
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]    Compiling core_affinity v0.5.10
[INFO] [stderr]    Compiling block-padding v0.1.5
[INFO] [stderr]    Compiling ppv-lite86 v0.1.2
[INFO] [stderr]    Compiling ppv-null v0.1.2
[INFO] [stderr]    Compiling proc-macro-hack v0.4.2
[INFO] [stderr]    Compiling hex-literal-impl v0.1.2
[INFO] [stderr]    Compiling generic-array v0.12.3
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling hex-literal v0.1.4
[INFO] [stderr]    Compiling digest v0.8.1
[INFO] [stderr]    Compiling block-buffer v0.7.3
[INFO] [stderr]    Compiling block-cipher-trait v0.6.2
[INFO] [stderr]    Compiling threefish-cipher v0.3.1
[INFO] [stderr]    Compiling blake-hash v0.2.0
[INFO] [stderr]    Compiling sha3 v0.8.2
[INFO] [stderr]    Compiling jh-x86_64 v0.2.2
[INFO] [stderr]    Compiling groestl-aesni v0.2.2
[INFO] [stderr]    Compiling skein-hash v0.3.0
[INFO] [stderr]    Compiling failure v0.1.8
[INFO] [stderr]    Compiling yellowsun v0.2.3
[INFO] [stderr]    Compiling cn-stratum v0.4.1
[INFO] [stderr]    Compiling powhasher v0.2.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0463]: can't find crate for `alloc_system`
[INFO] [stdout]  --> src/main.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | extern crate alloc_system;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0463`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `powhasher`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "4cf800173cf5ff1c65743379965330fc7dc53474f73236e4458777a35defc5df", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4cf800173cf5ff1c65743379965330fc7dc53474f73236e4458777a35defc5df", kill_on_drop: false }`
[INFO] [stdout] 4cf800173cf5ff1c65743379965330fc7dc53474f73236e4458777a35defc5df