[INFO] fetching crate isomer 0.0.0...
[INFO] checking isomer-0.0.0 against master#cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c for pr-143170
[INFO] extracting crate isomer 0.0.0 into /workspace/builds/worker-5-tc1/source
[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-5-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate isomer 0.0.0 on toolchain cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 20 packages to latest compatible versions
[INFO] [stderr]       Adding dashu v0.3.1 (available: v0.4.2)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded dashu-macros v0.3.1
[INFO] [stderr]   Downloaded dashu v0.3.1
[INFO] [stderr]   Downloaded dashu-ratio v0.3.2
[INFO] [stderr]   Downloaded dashu-base v0.3.1
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8aea89d2b3c37a996ee39ad928719552e5b4a6e128c7b7bbf39ec0cb26584ac1
[INFO] running `Command { std: "docker" "start" "-a" "8aea89d2b3c37a996ee39ad928719552e5b4a6e128c7b7bbf39ec0cb26584ac1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8aea89d2b3c37a996ee39ad928719552e5b4a6e128c7b7bbf39ec0cb26584ac1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8aea89d2b3c37a996ee39ad928719552e5b4a6e128c7b7bbf39ec0cb26584ac1", kill_on_drop: false }`
[INFO] [stdout] 8aea89d2b3c37a996ee39ad928719552e5b4a6e128c7b7bbf39ec0cb26584ac1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3486ffe2c5d76db4d17238cca1c14c748861b1674e1c03688d098198c3fb78a2
[INFO] running `Command { std: "docker" "start" "-a" "3486ffe2c5d76db4d17238cca1c14c748861b1674e1c03688d098198c3fb78a2", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.5.0
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling num-modular v0.6.1
[INFO] [stderr]    Compiling dashu-base v0.3.1
[INFO] [stderr]    Compiling cfg-if v1.0.1
[INFO] [stderr]    Compiling static_assertions v1.1.0
[INFO] [stderr]    Compiling crossbeam-utils v0.8.21
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]     Checking crossbeam-epoch v0.9.18
[INFO] [stderr]     Checking num-order v1.2.0
[INFO] [stderr]     Checking crossbeam-skiplist v0.1.3
[INFO] [stderr]     Checking dashu-int v0.3.1
[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 8.52s
[INFO] running `Command { std: "docker" "inspect" "3486ffe2c5d76db4d17238cca1c14c748861b1674e1c03688d098198c3fb78a2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3486ffe2c5d76db4d17238cca1c14c748861b1674e1c03688d098198c3fb78a2", kill_on_drop: false }`
[INFO] [stdout] 3486ffe2c5d76db4d17238cca1c14c748861b1674e1c03688d098198c3fb78a2