[INFO] fetching crate isomer 0.0.0...
[INFO] checking isomer-0.0.0 against master#f167efad2f51088d86180ee89177b3d7c9e7c2f5 for pr-129543
[INFO] extracting crate isomer 0.0.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate isomer 0.0.0 on toolchain f167efad2f51088d86180ee89177b3d7c9e7c2f5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "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-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded dashu-float v0.3.2
[INFO] [stderr]   Downloaded dashu-macros v0.3.1
[INFO] [stderr]   Downloaded dashu-base v0.3.1
[INFO] [stderr]   Downloaded crossbeam-skiplist v0.1.3
[INFO] [stderr]   Downloaded num-modular v0.6.1
[INFO] [stderr]   Downloaded num-order v1.2.0
[INFO] [stderr]   Downloaded dashu v0.3.1
[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-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] db087f594974ae1c203fdf9d98dba6b9940e751dda501380cb0bc2a3846b7f94
[INFO] running `Command { std: "docker" "start" "-a" "db087f594974ae1c203fdf9d98dba6b9940e751dda501380cb0bc2a3846b7f94", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "db087f594974ae1c203fdf9d98dba6b9940e751dda501380cb0bc2a3846b7f94", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "db087f594974ae1c203fdf9d98dba6b9940e751dda501380cb0bc2a3846b7f94", kill_on_drop: false }`
[INFO] [stdout] db087f594974ae1c203fdf9d98dba6b9940e751dda501380cb0bc2a3846b7f94
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 83261f795ca1efffb4e12fdb4a29aa58e9ba88efa18932fe54520a355de4541e
[INFO] running `Command { std: "docker" "start" "-a" "83261f795ca1efffb4e12fdb4a29aa58e9ba88efa18932fe54520a355de4541e", kill_on_drop: false }`
[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 static_assertions v1.1.0
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]     Checking crossbeam-skiplist v0.1.3
[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 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 12.39s
[INFO] running `Command { std: "docker" "inspect" "83261f795ca1efffb4e12fdb4a29aa58e9ba88efa18932fe54520a355de4541e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "83261f795ca1efffb4e12fdb4a29aa58e9ba88efa18932fe54520a355de4541e", kill_on_drop: false }`
[INFO] [stdout] 83261f795ca1efffb4e12fdb4a29aa58e9ba88efa18932fe54520a355de4541e