[INFO] fetching crate cpython-json 0.3.0...
[INFO] checking cpython-json-0.3.0 against master#4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5 for pr-81174
[INFO] extracting crate cpython-json 0.3.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate cpython-json 0.3.0 on toolchain 4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate cpython-json 0.3.0
[INFO] finished tweaking crates.io crate cpython-json 0.3.0
[INFO] tweaked toml for crates.io crate cpython-json 0.3.0 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "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" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e7c88212deb4f12b0b5c9726dd80efa9c6f2ab0c161fc185fa836cf7ccc79348
[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" "e7c88212deb4f12b0b5c9726dd80efa9c6f2ab0c161fc185fa836cf7ccc79348", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e7c88212deb4f12b0b5c9726dd80efa9c6f2ab0c161fc185fa836cf7ccc79348", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e7c88212deb4f12b0b5c9726dd80efa9c6f2ab0c161fc185fa836cf7ccc79348", kill_on_drop: false }`
[INFO] [stdout] e7c88212deb4f12b0b5c9726dd80efa9c6f2ab0c161fc185fa836cf7ccc79348
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 333dc21ef7d1b60fb1144ab2b53744b4d1d8765a8710795012fc4c0ab2ca4356
[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" "333dc21ef7d1b60fb1144ab2b53744b4d1d8765a8710795012fc4c0ab2ca4356", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.123
[INFO] [stderr]    Compiling cpython v0.2.1
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling aho-corasick v0.7.15
[INFO] [stderr]    Compiling regex v1.4.3
[INFO] [stderr]    Compiling python3-sys v0.2.1
[INFO] [stderr]     Checking serde_json v1.0.61
[INFO] [stderr]     Checking cpython-json v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/lib.rs:202:40
[INFO] [stdout]     |
[INFO] [stdout] 202 |           |x: &PyList| Ok(Value::Array(try!(x.iter(py).map(|x| to_json(py, &x)).collect()))));
[INFO] [stdout]     |                                        ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/lib.rs:204:41
[INFO] [stdout]     |
[INFO] [stdout] 204 |           |x: &PyTuple| Ok(Value::Array(try!(x.iter(py).map(|x| to_json(py, x)).collect()))));
[INFO] [stdout]     |                                         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/lib.rs:202:40
[INFO] [stdout]     |
[INFO] [stdout] 202 |           |x: &PyList| Ok(Value::Array(try!(x.iter(py).map(|x| to_json(py, &x)).collect()))));
[INFO] [stdout]     |                                        ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/lib.rs:204:41
[INFO] [stdout]     |
[INFO] [stdout] 204 |           |x: &PyTuple| Ok(Value::Array(try!(x.iter(py).map(|x| to_json(py, x)).collect()))));
[INFO] [stdout]     |                                         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 23.90s
[INFO] running `Command { std: "docker" "inspect" "333dc21ef7d1b60fb1144ab2b53744b4d1d8765a8710795012fc4c0ab2ca4356", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "333dc21ef7d1b60fb1144ab2b53744b4d1d8765a8710795012fc4c0ab2ca4356", kill_on_drop: false }`
[INFO] [stdout] 333dc21ef7d1b60fb1144ab2b53744b4d1d8765a8710795012fc4c0ab2ca4356