[INFO] fetching crate isomer 0.0.0...
[INFO] checking isomer-0.0.0 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] extracting crate isomer 0.0.0 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate isomer 0.0.0 on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate isomer 0.0.0
[INFO] finished tweaking crates.io crate isomer 0.0.0
[INFO] tweaked toml for crates.io crate isomer 0.0.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 21 packages to latest compatible versions
[INFO] [stderr]       Adding dashu v0.3.1 (latest: v0.4.2)
[INFO] [stderr]       Adding dashu-base v0.3.1 (latest: v0.4.1)
[INFO] [stderr]       Adding dashu-float v0.3.2 (latest: v0.4.3)
[INFO] [stderr]       Adding dashu-int v0.3.1 (latest: v0.4.1)
[INFO] [stderr]       Adding dashu-macros v0.3.1 (latest: v0.4.1)
[INFO] [stderr]       Adding dashu-ratio v0.3.2 (latest: v0.4.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded num-modular v0.6.1
[INFO] [stderr]   Downloaded dashu v0.3.1
[INFO] [stderr]   Downloaded dashu-macros v0.3.1
[INFO] [stderr]   Downloaded dashu-base v0.3.1
[INFO] [stderr]   Downloaded num-order v1.2.0
[INFO] [stderr]   Downloaded crossbeam-skiplist v0.1.3
[INFO] [stderr]   Downloaded dashu-float v0.3.2
[INFO] [stderr]   Downloaded dashu-int v0.3.1
[INFO] [stderr]   Downloaded dashu-ratio v0.3.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 82d11979d1edd307c28ad72d05c9fccbd9f65762f3f1959d188895c20e156867
[INFO] running `Command { std: "docker" "start" "-a" "82d11979d1edd307c28ad72d05c9fccbd9f65762f3f1959d188895c20e156867", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "82d11979d1edd307c28ad72d05c9fccbd9f65762f3f1959d188895c20e156867", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "82d11979d1edd307c28ad72d05c9fccbd9f65762f3f1959d188895c20e156867", kill_on_drop: false }`
[INFO] [stdout] 82d11979d1edd307c28ad72d05c9fccbd9f65762f3f1959d188895c20e156867
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "RUSTDOCFLAGS=--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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8b9b916b4bc3968a0607949bb6f04321f1463cd6424b306642e48293fcc75eaf
[INFO] running `Command { std: "docker" "start" "-a" "8b9b916b4bc3968a0607949bb6f04321f1463cd6424b306642e48293fcc75eaf", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-modular v0.6.1
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling dashu-base v0.3.1
[INFO] [stderr]    Compiling static_assertions v1.1.0
[INFO] [stderr]    Compiling crossbeam-utils v0.8.20
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking num-order v1.2.0
[INFO] [stderr]     Checking dashu-int v0.3.1
[INFO] [stderr]     Checking crossbeam-epoch v0.9.18
[INFO] [stderr]     Checking crossbeam-skiplist v0.1.3
[INFO] [stderr]     Checking dashu-float v0.3.2
[INFO] [stderr]     Checking dashu-ratio v0.3.2
[INFO] [stderr]    Compiling dashu-macros v0.3.1
[INFO] [stderr]     Checking dashu v0.3.1
[INFO] [stderr]     Checking isomer v0.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.80s
[INFO] running `Command { std: "docker" "inspect" "8b9b916b4bc3968a0607949bb6f04321f1463cd6424b306642e48293fcc75eaf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b9b916b4bc3968a0607949bb6f04321f1463cd6424b306642e48293fcc75eaf", kill_on_drop: false }`
[INFO] [stdout] 8b9b916b4bc3968a0607949bb6f04321f1463cd6424b306642e48293fcc75eaf