[INFO] fetching crate imex 0.2.1...
[INFO] checking imex-0.2.1 against beta for pr-78714
[INFO] extracting crate imex 0.2.1 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate imex 0.2.1 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 imex 0.2.1
[INFO] finished tweaking crates.io crate imex 0.2.1
[INFO] tweaked toml for crates.io crate imex 0.2.1 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate crates.io crate imex 0.2.1 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-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" "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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 2734826752ea0a8962cb1ea01e7db469cbafb28be620d45550306fc131c6d77d
[INFO] running `Command { std: "docker" "start" "-a" "2734826752ea0a8962cb1ea01e7db469cbafb28be620d45550306fc131c6d77d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2734826752ea0a8962cb1ea01e7db469cbafb28be620d45550306fc131c6d77d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2734826752ea0a8962cb1ea01e7db469cbafb28be620d45550306fc131c6d77d", kill_on_drop: false }`
[INFO] [stdout] 2734826752ea0a8962cb1ea01e7db469cbafb28be620d45550306fc131c6d77d
[INFO] running `Command { std: "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" "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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e10f974c18a07fcb2fee4cc34baabaeab3e6bf6f11aef90a940c9c7e56a32d44
[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" "e10f974c18a07fcb2fee4cc34baabaeab3e6bf6f11aef90a940c9c7e56a32d44", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.77
[INFO] [stderr]    Compiling lexical-core v0.7.4
[INFO] [stderr]     Checking arrayvec v0.5.1
[INFO] [stderr]    Compiling nom v5.1.2
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking imex v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.56s
[INFO] running `Command { std: "docker" "inspect" "e10f974c18a07fcb2fee4cc34baabaeab3e6bf6f11aef90a940c9c7e56a32d44", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e10f974c18a07fcb2fee4cc34baabaeab3e6bf6f11aef90a940c9c7e56a32d44", kill_on_drop: false }`
[INFO] [stdout] e10f974c18a07fcb2fee4cc34baabaeab3e6bf6f11aef90a940c9c7e56a32d44