[INFO] fetching crate common-tree 0.1.1...
[INFO] testing common-tree-0.1.1 against 1.55.0 for beta-1.56-1
[INFO] extracting crate common-tree 0.1.1 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate common-tree 0.1.1 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate common-tree 0.1.1
[INFO] finished tweaking crates.io crate common-tree 0.1.1
[INFO] tweaked toml for crates.io crate common-tree 0.1.1 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate crates.io crate common-tree 0.1.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c47ca2de352c28c778169def58b99b59c95445089a9c3c5b88034d62057f6294
[INFO] running `Command { std: "docker" "start" "-a" "c47ca2de352c28c778169def58b99b59c95445089a9c3c5b88034d62057f6294", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c47ca2de352c28c778169def58b99b59c95445089a9c3c5b88034d62057f6294", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c47ca2de352c28c778169def58b99b59c95445089a9c3c5b88034d62057f6294", kill_on_drop: false }`
[INFO] [stdout] c47ca2de352c28c778169def58b99b59c95445089a9c3c5b88034d62057f6294
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dddbfc31f614fcbfba71de443bf7070a7273e8e308d2b9e774d4ae7d377c4837
[INFO] running `Command { std: "docker" "start" "-a" "dddbfc31f614fcbfba71de443bf7070a7273e8e308d2b9e774d4ae7d377c4837", kill_on_drop: false }`
[INFO] [stderr]    Compiling common-tree v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.31s
[INFO] running `Command { std: "docker" "inspect" "dddbfc31f614fcbfba71de443bf7070a7273e8e308d2b9e774d4ae7d377c4837", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dddbfc31f614fcbfba71de443bf7070a7273e8e308d2b9e774d4ae7d377c4837", kill_on_drop: false }`
[INFO] [stdout] dddbfc31f614fcbfba71de443bf7070a7273e8e308d2b9e774d4ae7d377c4837
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2d4a9c8d68b2c7dbad9265add5869675f32de06e85969a9b57e2e3622aa9714c
[INFO] running `Command { std: "docker" "start" "-a" "2d4a9c8d68b2c7dbad9265add5869675f32de06e85969a9b57e2e3622aa9714c", kill_on_drop: false }`
[INFO] [stderr]    Compiling common-tree v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `level2_2`
[INFO] [stdout]    --> src/node.rs:168:13
[INFO] [stdout]     |
[INFO] [stdout] 168 |         let level2_2 = Node::new(level2_2_data.clone());
[INFO] [stdout]     |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_level2_2`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/node.rs:138:13
[INFO] [stdout]     |
[INFO] [stdout] 138 |         let mut data = node.data_mut();
[INFO] [stdout]     |             ----^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/node.rs:195:13
[INFO] [stdout]     |
[INFO] [stdout] 195 |         let mut root = get_tree();
[INFO] [stdout]     |             ----^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/node.rs:234:13
[INFO] [stdout]     |
[INFO] [stdout] 234 |         let mut root = get_tree2();
[INFO] [stdout]     |             ----^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.03s
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "2d4a9c8d68b2c7dbad9265add5869675f32de06e85969a9b57e2e3622aa9714c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2d4a9c8d68b2c7dbad9265add5869675f32de06e85969a9b57e2e3622aa9714c", kill_on_drop: false }`
[INFO] [stdout] 2d4a9c8d68b2c7dbad9265add5869675f32de06e85969a9b57e2e3622aa9714c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 195ec1ebbebd932ae6351e1f04cc6f79fbed118586ac24c6a4fee7eabef9f0be
[INFO] running `Command { std: "docker" "start" "-a" "195ec1ebbebd932ae6351e1f04cc6f79fbed118586ac24c6a4fee7eabef9f0be", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `level2_2`
[INFO] [stderr]    --> src/node.rs:168:13
[INFO] [stderr]     |
[INFO] [stderr] 168 |         let level2_2 = Node::new(level2_2_data.clone());
[INFO] [stderr]     |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_level2_2`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/node.rs:138:13
[INFO] [stderr]     |
[INFO] [stderr] 138 |         let mut data = node.data_mut();
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/node.rs:195:13
[INFO] [stderr]     |
[INFO] [stderr] 195 |         let mut root = get_tree();
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/node.rs:234:13
[INFO] [stderr]     |
[INFO] [stderr] 234 |         let mut root = get_tree2();
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: `common-tree` (lib test) generated 4 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/common_tree-245f0060cd841a26)
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests common-tree
[INFO] [stdout] running 4 tests
[INFO] [stdout] test node::tests::child_path_works ... ok
[INFO] [stdout] test node::tests::data_works ... ok
[INFO] [stdout] test node::tests::child_works ... ok
[INFO] [stdout] test node::tests::traversal_works ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[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] running `Command { std: "docker" "inspect" "195ec1ebbebd932ae6351e1f04cc6f79fbed118586ac24c6a4fee7eabef9f0be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "195ec1ebbebd932ae6351e1f04cc6f79fbed118586ac24c6a4fee7eabef9f0be", kill_on_drop: false }`
[INFO] [stdout] 195ec1ebbebd932ae6351e1f04cc6f79fbed118586ac24c6a4fee7eabef9f0be