[INFO] fetching crate midir 0.7.0...
[INFO] checking midir-0.7.0 against beta for pr-78714
[INFO] extracting crate midir 0.7.0 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate midir 0.7.0 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate midir 0.7.0
[INFO] finished tweaking crates.io crate midir 0.7.0
[INFO] tweaked toml for crates.io crate midir 0.7.0 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate crates.io crate midir 0.7.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 10f22d30137ada01e1e03347c47b7d1fbe97c2944e9a5aecea792f3aa0fe27af
[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" "10f22d30137ada01e1e03347c47b7d1fbe97c2944e9a5aecea792f3aa0fe27af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "10f22d30137ada01e1e03347c47b7d1fbe97c2944e9a5aecea792f3aa0fe27af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "10f22d30137ada01e1e03347c47b7d1fbe97c2944e9a5aecea792f3aa0fe27af", kill_on_drop: false }`
[INFO] [stdout] 10f22d30137ada01e1e03347c47b7d1fbe97c2944e9a5aecea792f3aa0fe27af
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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=forbid" "-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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9d36b24ec13e49a1e4664df01734c2d7f69cf04e9d38ebd2efe330deaffc0244
[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" "9d36b24ec13e49a1e4664df01734c2d7f69cf04e9d38ebd2efe330deaffc0244", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]     Checking memalloc v0.1.0
[INFO] [stderr]    Compiling alsa-sys v0.3.0
[INFO] [stderr]     Checking nix v0.15.0
[INFO] [stderr]     Checking alsa v0.4.2
[INFO] [stderr]     Checking midir v0.7.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 17.13s
[INFO] running `Command { std: "docker" "inspect" "9d36b24ec13e49a1e4664df01734c2d7f69cf04e9d38ebd2efe330deaffc0244", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9d36b24ec13e49a1e4664df01734c2d7f69cf04e9d38ebd2efe330deaffc0244", kill_on_drop: false }`
[INFO] [stdout] 9d36b24ec13e49a1e4664df01734c2d7f69cf04e9d38ebd2efe330deaffc0244