[INFO] fetching crate ent 0.0.4...
[INFO] checking ent-0.0.4 against master#506512391b1a75ae450d36c9420978402a91abcc for pr-125384
[INFO] extracting crate ent 0.0.4 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate ent 0.0.4 on toolchain 506512391b1a75ae450d36c9420978402a91abcc
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", 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-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 38 packages to latest compatible versions
[INFO] [stderr]       Adding bitflags v1.3.2 (latest: v2.5.0)
[INFO] [stderr]       Adding ctor v0.1.26 (latest: v0.2.8)
[INFO] [stderr]       Adding indoc v0.3.6 (latest: v2.0.5)
[INFO] [stderr]       Adding indoc-impl v0.3.6 (latest: v0.3.7)
[INFO] [stderr]       Adding inventory v0.1.11 (latest: v0.3.15)
[INFO] [stderr]       Adding parking_lot v0.11.2 (latest: v0.12.3)
[INFO] [stderr]       Adding parking_lot_core v0.8.6 (latest: v0.9.10)
[INFO] [stderr]       Adding paste v0.1.18 (latest: v1.0.15)
[INFO] [stderr]       Adding pyo3 v0.11.1 (latest: v0.21.2)
[INFO] [stderr]       Adding pyo3-derive-backend v0.11.1 (latest: v0.12.5)
[INFO] [stderr]       Adding pyo3cls v0.11.1 (latest: v0.12.5)
[INFO] [stderr]       Adding redox_syscall v0.2.16 (latest: v0.5.1)
[INFO] [stderr]       Adding syn v1.0.109 (latest: v2.0.66)
[INFO] [stderr]       Adding unindent v0.1.11 (latest: v0.2.3)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "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 pyo3cls v0.11.1
[INFO] [stderr]   Downloaded pyo3-derive-backend v0.11.1
[INFO] [stderr]   Downloaded pyo3 v0.11.1
[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:beeedbb442662e57d416641ecc3200b38e573c25b057896194468d05594dd835" "/opt/rustwide/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dcacc8fabd2846e0973bbe29353a9735827905f7a3b2f06152a9041bed16c1ee
[INFO] running `Command { std: "docker" "start" "-a" "dcacc8fabd2846e0973bbe29353a9735827905f7a3b2f06152a9041bed16c1ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dcacc8fabd2846e0973bbe29353a9735827905f7a3b2f06152a9041bed16c1ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dcacc8fabd2846e0973bbe29353a9735827905f7a3b2f06152a9041bed16c1ee", kill_on_drop: false }`
[INFO] [stdout] dcacc8fabd2846e0973bbe29353a9735827905f7a3b2f06152a9041bed16c1ee
[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=allow" "-e" "RUSTDOCFLAGS=--cap-lints=allow" "-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:beeedbb442662e57d416641ecc3200b38e573c25b057896194468d05594dd835" "/opt/rustwide/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 85bed9da48e60ee4cb1a02201ddb3080c94172da3fe1c1bd504f6d8eb391acaf
[INFO] running `Command { std: "docker" "start" "-a" "85bed9da48e60ee4cb1a02201ddb3080c94172da3fe1c1bd504f6d8eb391acaf", 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:10:32
[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[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: 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` (test "basic") due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "85bed9da48e60ee4cb1a02201ddb3080c94172da3fe1c1bd504f6d8eb391acaf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "85bed9da48e60ee4cb1a02201ddb3080c94172da3fe1c1bd504f6d8eb391acaf", kill_on_drop: false }`
[INFO] [stdout] 85bed9da48e60ee4cb1a02201ddb3080c94172da3fe1c1bd504f6d8eb391acaf