[INFO] fetching crate serpente 0.5.0...
[INFO] testing serpente-0.5.0 against beta-2021-01-01 for beta-1.50-1
[INFO] extracting crate serpente 0.5.0 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate serpente 0.5.0 on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-5/source/.cargo/config
[INFO] started tweaking crates.io crate serpente 0.5.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate serpente 0.5.0
[INFO] tweaked toml for crates.io crate serpente 0.5.0 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate crates.io crate serpente 0.5.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded atsamd21e v0.9.0
[INFO] [stderr]   Downloaded atsamd-hal v0.12.0
[INFO] [stderr]   Downloaded panic-halt v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c6f4a88757d8bf9457760f6d796a11ffa16f16074497ad54fd6616e134a2a5b5
[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" "c6f4a88757d8bf9457760f6d796a11ffa16f16074497ad54fd6616e134a2a5b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c6f4a88757d8bf9457760f6d796a11ffa16f16074497ad54fd6616e134a2a5b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c6f4a88757d8bf9457760f6d796a11ffa16f16074497ad54fd6616e134a2a5b5", kill_on_drop: false }`
[INFO] [stdout] c6f4a88757d8bf9457760f6d796a11ffa16f16074497ad54fd6616e134a2a5b5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 58a9f468abf42bdbd613c3ec13987110ebe8224a2012b636c0ade9bd1cd8a4f0
[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" "58a9f468abf42bdbd613c3ec13987110ebe8224a2012b636c0ade9bd1cd8a4f0", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.56
[INFO] [stderr]    Compiling cortex-m-rt v0.6.13
[INFO] [stderr]    Compiling vcell v0.1.2
[INFO] [stderr]    Compiling atsamd21e v0.9.0
[INFO] [stderr]    Compiling r0 v0.2.2
[INFO] [stderr]    Compiling paste v1.0.4
[INFO] [stderr]    Compiling serpente v0.5.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling volatile-register v0.2.0
[INFO] [stderr]    Compiling cortex-m v0.6.4
[INFO] [stderr]    Compiling cortex-m-rt-macros v0.1.8
[INFO] [stderr]    Compiling atsamd-hal v0.12.0
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 27.96s
[INFO] running `Command { std: "docker" "inspect" "58a9f468abf42bdbd613c3ec13987110ebe8224a2012b636c0ade9bd1cd8a4f0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "58a9f468abf42bdbd613c3ec13987110ebe8224a2012b636c0ade9bd1cd8a4f0", kill_on_drop: false }`
[INFO] [stdout] 58a9f468abf42bdbd613c3ec13987110ebe8224a2012b636c0ade9bd1cd8a4f0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 67cee46156f1318501860b893147d1e8f0ae27b23810f46f81971bc4ba9dc32f
[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" "67cee46156f1318501860b893147d1e8f0ae27b23810f46f81971bc4ba9dc32f", kill_on_drop: false }`
[INFO] [stderr]    Compiling panic-halt v0.2.0
[INFO] [stderr]    Compiling serpente v0.5.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: language item required, but not found: `eh_personality`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `serpente`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "67cee46156f1318501860b893147d1e8f0ae27b23810f46f81971bc4ba9dc32f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "67cee46156f1318501860b893147d1e8f0ae27b23810f46f81971bc4ba9dc32f", kill_on_drop: false }`
[INFO] [stdout] 67cee46156f1318501860b893147d1e8f0ae27b23810f46f81971bc4ba9dc32f