[INFO] fetching crate preserves 2.0.0-rc.2...
[INFO] checking preserves-2.0.0-rc.2 against try#8de4b308b608cded0ebccf658a0fc719bce87d4e for pr-89056
[INFO] extracting crate preserves 2.0.0-rc.2 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate preserves 2.0.0-rc.2 on toolchain 8de4b308b608cded0ebccf658a0fc719bce87d4e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate preserves 2.0.0-rc.2
[INFO] finished tweaking crates.io crate preserves 2.0.0-rc.2
[INFO] tweaked toml for crates.io crate preserves 2.0.0-rc.2 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate preserves 2.0.0-rc.2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "fetch" "--manifest-path" "Cargo.toml", 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e6e5eb6db66b6caa34ac89969bbaf3a08dfb323a193cb8193aa4aa2a2bc12835
[INFO] running `Command { std: "docker" "start" "-a" "e6e5eb6db66b6caa34ac89969bbaf3a08dfb323a193cb8193aa4aa2a2bc12835", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e6e5eb6db66b6caa34ac89969bbaf3a08dfb323a193cb8193aa4aa2a2bc12835", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e6e5eb6db66b6caa34ac89969bbaf3a08dfb323a193cb8193aa4aa2a2bc12835", kill_on_drop: false }`
[INFO] [stdout] e6e5eb6db66b6caa34ac89969bbaf3a08dfb323a193cb8193aa4aa2a2bc12835
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e9c69543bc23300ffe9ed2a5e4abb9e816e4d5b46eaaf49a353c2c97012feb7f
[INFO] running `Command { std: "docker" "start" "-a" "e9c69543bc23300ffe9ed2a5e4abb9e816e4d5b46eaaf49a353c2c97012feb7f", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking unicode-width v0.1.9
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]     Checking plotters-backend v0.3.2
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking dtoa v0.4.8
[INFO] [stderr]     Checking base64 v0.13.0
[INFO] [stderr]     Checking oorandom v11.1.3
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-bigint v0.4.2
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling num-rational v0.4.0
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling semver v1.0.4
[INFO] [stderr]     Checking crossbeam-utils v0.8.5
[INFO] [stderr]     Checking itertools v0.10.1
[INFO] [stderr]     Checking walkdir v2.3.2
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking plotters-svg v0.3.1
[INFO] [stderr]     Checking crossbeam-channel v0.5.1
[INFO] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]     Checking crossbeam-epoch v0.9.5
[INFO] [stderr]    Compiling cast v0.2.7
[INFO] [stderr]     Checking crossbeam-deque v0.8.1
[INFO] [stderr]     Checking rayon-core v1.9.1
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking num-complex v0.4.0
[INFO] [stderr]     Checking plotters v0.3.1
[INFO] [stderr]     Checking criterion-plot v0.4.4
[INFO] [stderr]     Checking num v0.4.0
[INFO] [stderr]     Checking bstr v0.2.16
[INFO] [stderr]     Checking serde_json v1.0.68
[INFO] [stderr]     Checking serde_bytes v0.11.5
[INFO] [stderr]     Checking serde_cbor v0.11.2
[INFO] [stderr]     Checking preserves v2.0.0-rc.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking csv v1.1.6
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking criterion v0.3.5
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 20.31s
[INFO] running `Command { std: "docker" "inspect" "e9c69543bc23300ffe9ed2a5e4abb9e816e4d5b46eaaf49a353c2c97012feb7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e9c69543bc23300ffe9ed2a5e4abb9e816e4d5b46eaaf49a353c2c97012feb7f", kill_on_drop: false }`
[INFO] [stdout] e9c69543bc23300ffe9ed2a5e4abb9e816e4d5b46eaaf49a353c2c97012feb7f