[INFO] fetching crate syntax-tree 0.3.2...
[INFO] testing syntax-tree-0.3.2 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate syntax-tree 0.3.2 into /workspace/builds/worker-36/source
[INFO] validating manifest of crates.io crate syntax-tree 0.3.2 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate syntax-tree 0.3.2
[INFO] finished tweaking crates.io crate syntax-tree 0.3.2
[INFO] tweaked toml for crates.io crate syntax-tree 0.3.2 written to /workspace/builds/worker-36/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "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" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/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" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bd885a55765de1b263d6bf965270b72a40e7fb58e77d2f485227739f25f2ab4c
[INFO] running `Command { std: "docker" "start" "-a" "bd885a55765de1b263d6bf965270b72a40e7fb58e77d2f485227739f25f2ab4c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bd885a55765de1b263d6bf965270b72a40e7fb58e77d2f485227739f25f2ab4c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd885a55765de1b263d6bf965270b72a40e7fb58e77d2f485227739f25f2ab4c", kill_on_drop: false }`
[INFO] [stdout] bd885a55765de1b263d6bf965270b72a40e7fb58e77d2f485227739f25f2ab4c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/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" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 31c818497aee62f7ebc37d423adf9ab0e48de58e7b4cd1ad48c57aba570e2077
[INFO] running `Command { std: "docker" "start" "-a" "31c818497aee62f7ebc37d423adf9ab0e48de58e7b4cd1ad48c57aba570e2077", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.101
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling uuid v0.8.2
[INFO] [stderr]    Compiling syntax-tree v0.3.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/node.rs:315:21
[INFO] [stdout]     |
[INFO] [stdout] 315 |                     &mut self.children.as_mut().unwrap().push(node);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 315 |                     let _ = &mut self.children.as_mut().unwrap().push(node);
[INFO] [stdout]     |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/node.rs:318:21
[INFO] [stdout]     |
[INFO] [stdout] 318 |                     &mut self.children.as_mut().unwrap().insert(idx, node);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 318 |                     let _ = &mut self.children.as_mut().unwrap().insert(idx, node);
[INFO] [stdout]     |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.66s
[INFO] running `Command { std: "docker" "inspect" "31c818497aee62f7ebc37d423adf9ab0e48de58e7b4cd1ad48c57aba570e2077", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "31c818497aee62f7ebc37d423adf9ab0e48de58e7b4cd1ad48c57aba570e2077", kill_on_drop: false }`
[INFO] [stdout] 31c818497aee62f7ebc37d423adf9ab0e48de58e7b4cd1ad48c57aba570e2077
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/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" "+beta-2021-09-08" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 103c7ced9f5662416036df2089a6f111445d0c5937010d38b64e37d9f8172275
[INFO] running `Command { std: "docker" "start" "-a" "103c7ced9f5662416036df2089a6f111445d0c5937010d38b64e37d9f8172275", kill_on_drop: false }`
[INFO] [stderr]    Compiling syntax-tree v0.3.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/node.rs:315:21
[INFO] [stdout]     |
[INFO] [stdout] 315 |                     &mut self.children.as_mut().unwrap().push(node);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 315 |                     let _ = &mut self.children.as_mut().unwrap().push(node);
[INFO] [stdout]     |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/node.rs:318:21
[INFO] [stdout]     |
[INFO] [stdout] 318 |                     &mut self.children.as_mut().unwrap().insert(idx, node);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 318 |                     let _ = &mut self.children.as_mut().unwrap().insert(idx, node);
[INFO] [stdout]     |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/node.rs:315:21
[INFO] [stdout]     |
[INFO] [stdout] 315 |                     &mut self.children.as_mut().unwrap().push(node);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 315 |                     let _ = &mut self.children.as_mut().unwrap().push(node);
[INFO] [stdout]     |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/node.rs:318:21
[INFO] [stdout]     |
[INFO] [stdout] 318 |                     &mut self.children.as_mut().unwrap().insert(idx, node);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 318 |                     let _ = &mut self.children.as_mut().unwrap().insert(idx, node);
[INFO] [stdout]     |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.56s
[INFO] running `Command { std: "docker" "inspect" "103c7ced9f5662416036df2089a6f111445d0c5937010d38b64e37d9f8172275", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "103c7ced9f5662416036df2089a6f111445d0c5937010d38b64e37d9f8172275", kill_on_drop: false }`
[INFO] [stdout] 103c7ced9f5662416036df2089a6f111445d0c5937010d38b64e37d9f8172275
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/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" "+beta-2021-09-08" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] ee71202ba7c7484436a633a164d8c60ba9f15d7156f860768c5b4a6aa14bee54
[INFO] running `Command { std: "docker" "start" "-a" "ee71202ba7c7484436a633a164d8c60ba9f15d7156f860768c5b4a6aa14bee54", kill_on_drop: false }`
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]    --> src/node.rs:315:21
[INFO] [stderr]     |
[INFO] [stderr] 315 |                     &mut self.children.as_mut().unwrap().push(node);
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 315 |                     let _ = &mut self.children.as_mut().unwrap().push(node);
[INFO] [stderr]     |                     +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]    --> src/node.rs:318:21
[INFO] [stderr]     |
[INFO] [stderr] 318 |                     &mut self.children.as_mut().unwrap().insert(idx, node);
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stderr]     |
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 318 |                     let _ = &mut self.children.as_mut().unwrap().insert(idx, node);
[INFO] [stderr]     |                     +++++++
[INFO] [stderr] 
[INFO] [stdout] 
[INFO] [stderr] warning: `syntax-tree` (lib) generated 2 warnings
[INFO] [stdout] running 0 tests
[INFO] [stderr] warning: `syntax-tree` (lib test) generated 2 warnings (2 duplicates)
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/syntax_tree-f4833a00e7f7f0b6)
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests syntax-tree
[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" "ee71202ba7c7484436a633a164d8c60ba9f15d7156f860768c5b4a6aa14bee54", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ee71202ba7c7484436a633a164d8c60ba9f15d7156f860768c5b4a6aa14bee54", kill_on_drop: false }`
[INFO] [stdout] ee71202ba7c7484436a633a164d8c60ba9f15d7156f860768c5b4a6aa14bee54