[INFO] fetching crate ent 0.0.4...
[INFO] checking ent-0.0.4 against try#8b72f65b805cbe4c261de45030d663f524f27376 for pr-78991
[INFO] extracting crate ent 0.0.4 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate ent 0.0.4 on toolchain 8b72f65b805cbe4c261de45030d663f524f27376
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8b72f65b805cbe4c261de45030d663f524f27376" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ent 0.0.4
[INFO] finished tweaking crates.io crate ent 0.0.4
[INFO] tweaked toml for crates.io crate ent 0.0.4 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8b72f65b805cbe4c261de45030d663f524f27376" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8b72f65b805cbe4c261de45030d663f524f27376" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded pyo3-derive-backend v0.11.1
[INFO] [stderr]   Downloaded pyo3cls v0.11.1
[INFO] [stderr]   Downloaded inventory-impl v0.1.9
[INFO] [stderr]   Downloaded inventory v0.1.9
[INFO] [stderr]   Downloaded pyo3 v0.11.1
[INFO] [stderr]   Downloaded indoc v0.3.6
[INFO] [stderr]   Downloaded ghost v0.1.2
[INFO] [stderr]   Downloaded indoc-impl v0.3.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+8b72f65b805cbe4c261de45030d663f524f27376" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5a8acf3cea58e1783c713812579184f8d1583c939c7590a1fbef6f905efd9c88
[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" "5a8acf3cea58e1783c713812579184f8d1583c939c7590a1fbef6f905efd9c88", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5a8acf3cea58e1783c713812579184f8d1583c939c7590a1fbef6f905efd9c88", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5a8acf3cea58e1783c713812579184f8d1583c939c7590a1fbef6f905efd9c88", kill_on_drop: false }`
[INFO] [stdout] 5a8acf3cea58e1783c713812579184f8d1583c939c7590a1fbef6f905efd9c88
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+8b72f65b805cbe4c261de45030d663f524f27376" "check" "--frozen" "--all" "--all-targets" "--message-format=json", 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] 0f5a3e799a7177398afa8271f731d53122ac027266fd30a18388ecf0b13ac6d0
[INFO] running `Command { std: "docker" "start" "-a" "0f5a3e799a7177398afa8271f731d53122ac027266fd30a18388ecf0b13ac6d0", kill_on_drop: false }`
[INFO] [stderr]     Checking ent v0.0.4 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `serde_json`
[INFO] [stdout]   --> tests/basic.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let v: serde_json::Value = serde_json::from_str(r#"{"name":"test"}"#).unwrap();
[INFO] [stdout]    |            ^^^^^^^^^^ use of undeclared crate or module `serde_json`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `serde_json`
[INFO] [stdout]   --> tests/basic.rs:10:32
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let v: serde_json::Value = serde_json::from_str(r#"{"name":"test"}"#).unwrap();
[INFO] [stdout]    |                                ^^^^^^^^^^ use of undeclared crate or module `serde_json`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0433`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ent`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "0f5a3e799a7177398afa8271f731d53122ac027266fd30a18388ecf0b13ac6d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0f5a3e799a7177398afa8271f731d53122ac027266fd30a18388ecf0b13ac6d0", kill_on_drop: false }`
[INFO] [stdout] 0f5a3e799a7177398afa8271f731d53122ac027266fd30a18388ecf0b13ac6d0