[INFO] cloning repository https://github.com/dvtkrlbs/serde-exercise
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dvtkrlbs/serde-exercise" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdvtkrlbs%2Fserde-exercise", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdvtkrlbs%2Fserde-exercise'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2ca849aa41ca18a505fca9fc37374133ceec41a2
[INFO] checking dvtkrlbs/serde-exercise against try#f6e2f78768c57172b99c3e85892f867894dc7e30 for pr-75502
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdvtkrlbs%2Fserde-exercise" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dvtkrlbs/serde-exercise on toolchain f6e2f78768c57172b99c3e85892f867894dc7e30
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/dvtkrlbs/serde-exercise
[INFO] finished tweaking git repo https://github.com/dvtkrlbs/serde-exercise
[INFO] tweaked toml for git repo https://github.com/dvtkrlbs/serde-exercise written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/dvtkrlbs/serde-exercise already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "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] 7c1b36851542f13c3ea85fb2fcfe741cb72d253e32ebcdf9d006bd06459fa39d
[INFO] running `Command { std: "docker" "start" "-a" "7c1b36851542f13c3ea85fb2fcfe741cb72d253e32ebcdf9d006bd06459fa39d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7c1b36851542f13c3ea85fb2fcfe741cb72d253e32ebcdf9d006bd06459fa39d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7c1b36851542f13c3ea85fb2fcfe741cb72d253e32ebcdf9d006bd06459fa39d", kill_on_drop: false }`
[INFO] [stdout] 7c1b36851542f13c3ea85fb2fcfe741cb72d253e32ebcdf9d006bd06459fa39d
[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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9d6560e6c68ec05890c7ab7c86e722a91649eefde59a41056d8ad6c6deb669e5
[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" "9d6560e6c68ec05890c7ab7c86e722a91649eefde59a41056d8ad6c6deb669e5", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling syn v1.0.18
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling serde v1.0.106
[INFO] [stderr]     Checking linked-hash-map v0.5.2
[INFO] [stderr]     Checking hex v0.3.2
[INFO] [stderr]     Checking md5 v0.6.1
[INFO] [stderr]    Compiling proc-macro2 v1.0.12
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]    Compiling num-integer v0.1.42
[INFO] [stderr]    Compiling indexmap v1.3.2
[INFO] [stderr]    Compiling quote v1.0.4
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking base64 v0.10.1
[INFO] [stderr]     Checking chrono v0.4.11
[INFO] [stderr]    Compiling serde_derive v1.0.106
[INFO] [stderr]     Checking serde_json v1.0.52
[INFO] [stderr]     Checking ron v0.5.1
[INFO] [stderr]     Checking bson v0.14.1
[INFO] [stderr]     Checking serde-exercise v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 46.43s
[INFO] running `Command { std: "docker" "inspect" "9d6560e6c68ec05890c7ab7c86e722a91649eefde59a41056d8ad6c6deb669e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9d6560e6c68ec05890c7ab7c86e722a91649eefde59a41056d8ad6c6deb669e5", kill_on_drop: false }`
[INFO] [stdout] 9d6560e6c68ec05890c7ab7c86e722a91649eefde59a41056d8ad6c6deb669e5