[INFO] fetching crate graviton_backend 0.6.0...
[INFO] checking graviton_backend-0.6.0 against try#ffa4a0215752773248fb0f0a8092f1c3e7907e9e for pr-75585
[INFO] extracting crate graviton_backend 0.6.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate graviton_backend 0.6.0 on toolchain ffa4a0215752773248fb0f0a8092f1c3e7907e9e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ffa4a0215752773248fb0f0a8092f1c3e7907e9e" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate graviton_backend 0.6.0
[INFO] finished tweaking crates.io crate graviton_backend 0.6.0
[INFO] tweaked toml for crates.io crate graviton_backend 0.6.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ffa4a0215752773248fb0f0a8092f1c3e7907e9e" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ffa4a0215752773248fb0f0a8092f1c3e7907e9e" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded scroll_derive v0.10.2
[INFO] [stderr]   Downloaded scroll v0.10.1
[INFO] [stderr]   Downloaded plain v0.2.3
[INFO] [stderr]   Downloaded typetag-impl v0.1.5
[INFO] [stderr]   Downloaded crc16 v0.4.0
[INFO] [stderr]   Downloaded cranelift-frontend v0.56.0
[INFO] [stderr]   Downloaded cranelift-codegen-meta v0.56.0
[INFO] [stderr]   Downloaded goblin v0.1.3
[INFO] [stderr]   Downloaded cranelift-module v0.56.0
[INFO] [stderr]   Downloaded cranelift v0.56.0
[INFO] [stderr]   Downloaded string-interner v0.7.1
[INFO] [stderr]   Downloaded cranelift-bforest v0.56.0
[INFO] [stderr]   Downloaded cranelift-codegen v0.56.0
[INFO] [stderr]   Downloaded erased-serde v0.3.12
[INFO] [stderr]   Downloaded inventory-impl v0.1.8
[INFO] [stderr]   Downloaded inventory v0.1.8
[INFO] [stderr]   Downloaded cranelift-entity v0.56.0
[INFO] [stderr]   Downloaded ghost v0.1.2
[INFO] [stderr]   Downloaded target-lexicon v0.10.0
[INFO] [stderr]   Downloaded cranelift-faerie v0.56.0
[INFO] [stderr]   Downloaded raw-cpuid v7.0.3
[INFO] [stderr]   Downloaded faerie v0.14.0
[INFO] [stderr]   Downloaded cranelift-native v0.56.0
[INFO] [stderr]   Downloaded cranelift-codegen-shared v0.56.0
[INFO] [stderr]   Downloaded typetag v0.1.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+ffa4a0215752773248fb0f0a8092f1c3e7907e9e" "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] df15a885e8752402491f28cf9b0148adaa41209848f568e776e261cb5be3be86
[INFO] running `Command { std: "docker" "start" "-a" "df15a885e8752402491f28cf9b0148adaa41209848f568e776e261cb5be3be86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "df15a885e8752402491f28cf9b0148adaa41209848f568e776e261cb5be3be86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "df15a885e8752402491f28cf9b0148adaa41209848f568e776e261cb5be3be86", kill_on_drop: false }`
[INFO] [stdout] df15a885e8752402491f28cf9b0148adaa41209848f568e776e261cb5be3be86
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+ffa4a0215752773248fb0f0a8092f1c3e7907e9e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6d47e13763883f0d4b4c0229d5964692658fc888305cf49329833599899d1fe7
[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" "6d47e13763883f0d4b4c0229d5964692658fc888305cf49329833599899d1fe7", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.20
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling serde_derive v1.0.115
[INFO] [stderr]    Compiling target-lexicon v0.10.0
[INFO] [stderr]    Compiling serde v1.0.115
[INFO] [stderr]    Compiling cranelift-codegen-shared v0.56.0
[INFO] [stderr]    Compiling cranelift-entity v0.56.0
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling libc v0.2.76
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling cc v1.0.59
[INFO] [stderr]     Checking plain v0.2.3
[INFO] [stderr]    Compiling inventory v0.1.8
[INFO] [stderr]    Compiling hashbrown v0.8.2
[INFO] [stderr]    Compiling indexmap v1.5.2
[INFO] [stderr]     Checking log v0.4.11
[INFO] [stderr]     Checking anyhow v1.0.32
[INFO] [stderr]     Checking cranelift-bforest v0.56.0
[INFO] [stderr]    Compiling cranelift-codegen-meta v0.56.0
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling raw-cpuid v7.0.3
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking colored v1.9.3
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]    Compiling thiserror-impl v1.0.20
[INFO] [stderr]    Compiling scroll_derive v0.10.2
[INFO] [stderr]    Compiling inventory-impl v0.1.8
[INFO] [stderr]    Compiling ghost v0.1.2
[INFO] [stderr]    Compiling ctor v0.1.15
[INFO] [stderr]    Compiling typetag-impl v0.1.5
[INFO] [stderr]    Compiling cranelift-codegen v0.56.0
[INFO] [stderr]     Checking scroll v0.10.1
[INFO] [stderr]     Checking goblin v0.1.3
[INFO] [stderr]     Checking thiserror v1.0.20
[INFO] [stderr]     Checking string-interner v0.7.1
[INFO] [stderr]     Checking erased-serde v0.3.12
[INFO] [stderr]     Checking graviton_core v0.6.0
[INFO] [stderr]     Checking faerie v0.14.0
[INFO] [stderr]     Checking graviton_ast v0.6.0
[INFO] [stderr]     Checking typetag v0.1.5
[INFO] [stderr]     Checking cranelift-frontend v0.56.0
[INFO] [stderr]     Checking cranelift-module v0.56.0
[INFO] [stderr]     Checking cranelift-native v0.56.0
[INFO] [stderr]     Checking cranelift-faerie v0.56.0
[INFO] [stderr]     Checking cranelift v0.56.0
[INFO] [stderr]     Checking graviton_backend v0.6.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 13s
[INFO] running `Command { std: "docker" "inspect" "6d47e13763883f0d4b4c0229d5964692658fc888305cf49329833599899d1fe7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6d47e13763883f0d4b4c0229d5964692658fc888305cf49329833599899d1fe7", kill_on_drop: false }`
[INFO] [stdout] 6d47e13763883f0d4b4c0229d5964692658fc888305cf49329833599899d1fe7