[INFO] fetching crate json_logger 0.1.0...
[INFO] testing json_logger-0.1.0 against 1.60.0 for beta-1.61-1
[INFO] extracting crate json_logger 0.1.0 into /workspace/builds/worker-27/source
[INFO] validating manifest of crates.io crate json_logger 0.1.0 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate json_logger 0.1.0
[INFO] finished tweaking crates.io crate json_logger 0.1.0
[INFO] tweaked toml for crates.io crate json_logger 0.1.0 written to /workspace/builds/worker-27/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] eb92826a901e643d86fdf167d45b25961cb2e1206c30b767a36f3a5cf0d3edc4
[INFO] running `Command { std: "docker" "start" "-a" "eb92826a901e643d86fdf167d45b25961cb2e1206c30b767a36f3a5cf0d3edc4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eb92826a901e643d86fdf167d45b25961cb2e1206c30b767a36f3a5cf0d3edc4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb92826a901e643d86fdf167d45b25961cb2e1206c30b767a36f3a5cf0d3edc4", kill_on_drop: false }`
[INFO] [stdout] eb92826a901e643d86fdf167d45b25961cb2e1206c30b767a36f3a5cf0d3edc4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 161c8708f8f53892aa21766e1ea07b3d67ab931307864aeffb7b777fb4acd213
[INFO] running `Command { std: "docker" "start" "-a" "161c8708f8f53892aa21766e1ea07b3d67ab931307864aeffb7b777fb4acd213", kill_on_drop: false }`
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling json_logger v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.77s
[INFO] running `Command { std: "docker" "inspect" "161c8708f8f53892aa21766e1ea07b3d67ab931307864aeffb7b777fb4acd213", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "161c8708f8f53892aa21766e1ea07b3d67ab931307864aeffb7b777fb4acd213", kill_on_drop: false }`
[INFO] [stdout] 161c8708f8f53892aa21766e1ea07b3d67ab931307864aeffb7b777fb4acd213
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2803359a1e241d7790d6c3c492721f5cfce614d8ac988f3c2649671d4192556e
[INFO] running `Command { std: "docker" "start" "-a" "2803359a1e241d7790d6c3c492721f5cfce614d8ac988f3c2649671d4192556e", kill_on_drop: false }`
[INFO] [stderr]    Compiling json_logger v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.48s
[INFO] running `Command { std: "docker" "inspect" "2803359a1e241d7790d6c3c492721f5cfce614d8ac988f3c2649671d4192556e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2803359a1e241d7790d6c3c492721f5cfce614d8ac988f3c2649671d4192556e", kill_on_drop: false }`
[INFO] [stdout] 2803359a1e241d7790d6c3c492721f5cfce614d8ac988f3c2649671d4192556e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 481e988265c2c12b22fb4c595730f26668f02dd504f521e23c82c7489152ca4d
[INFO] running `Command { std: "docker" "start" "-a" "481e988265c2c12b22fb4c595730f26668f02dd504f521e23c82c7489152ca4d", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/json_logger-b44ab4d5982c7b1c)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests json_logger
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/lib.rs - (line 7) ... ignored
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "481e988265c2c12b22fb4c595730f26668f02dd504f521e23c82c7489152ca4d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "481e988265c2c12b22fb4c595730f26668f02dd504f521e23c82c7489152ca4d", kill_on_drop: false }`
[INFO] [stdout] 481e988265c2c12b22fb4c595730f26668f02dd504f521e23c82c7489152ca4d