[INFO] cloning repository https://github.com/jramos14/Binary-Search-Tree
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jramos14/Binary-Search-Tree" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjramos14%2FBinary-Search-Tree", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjramos14%2FBinary-Search-Tree'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8c5598a68c35fb07150343623512accd0811a259
[INFO] checking jramos14/Binary-Search-Tree against master#7b3a7819371cef92a187e9bac8f7810ccde15216 for pr-74846
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjramos14%2FBinary-Search-Tree" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jramos14/Binary-Search-Tree on toolchain 7b3a7819371cef92a187e9bac8f7810ccde15216
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7b3a7819371cef92a187e9bac8f7810ccde15216" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jramos14/Binary-Search-Tree
[INFO] finished tweaking git repo https://github.com/jramos14/Binary-Search-Tree
[INFO] tweaked toml for git repo https://github.com/jramos14/Binary-Search-Tree written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/jramos14/Binary-Search-Tree already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7b3a7819371cef92a187e9bac8f7810ccde15216" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+7b3a7819371cef92a187e9bac8f7810ccde15216" "metadata" "--no-deps" "--format-version=1", 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] f94252d855ff7c82a8c16eb0699273e708450e11ce975e0fc8876d334903f413
[INFO] running `Command { std: "docker" "start" "-a" "f94252d855ff7c82a8c16eb0699273e708450e11ce975e0fc8876d334903f413", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f94252d855ff7c82a8c16eb0699273e708450e11ce975e0fc8876d334903f413", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f94252d855ff7c82a8c16eb0699273e708450e11ce975e0fc8876d334903f413", kill_on_drop: false }`
[INFO] [stdout] f94252d855ff7c82a8c16eb0699273e708450e11ce975e0fc8876d334903f413
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+7b3a7819371cef92a187e9bac8f7810ccde15216" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1d6ff36fc8e9ddea2f067dd13d1dafdb97fe06465a8a2fff4583318ed635979f
[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" "1d6ff36fc8e9ddea2f067dd13d1dafdb97fe06465a8a2fff4583318ed635979f", kill_on_drop: false }`
[INFO] [stderr]     Checking your v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:228:29
[INFO] [stdout]     |
[INFO] [stdout] 228 |                         let mut result : &mut Vec<&'a T> = &mut left_node.preorder();
[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/lib.rs:247:29
[INFO] [stdout]     |
[INFO] [stdout] 247 |                         let mut result : &mut Vec<&'a T> = &mut right_node.preorder();
[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/lib.rs:277:21
[INFO] [stdout]     |
[INFO] [stdout] 277 |                 let mut result : &mut Vec<&'a T> = &mut left_node.inorder();
[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/lib.rs:296:21
[INFO] [stdout]     |
[INFO] [stdout] 296 |                 let mut result : &mut Vec<&'a T> = &mut right_node.inorder();
[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/lib.rs:318:25
[INFO] [stdout]     |
[INFO] [stdout] 318 |                     let mut result : &mut Vec<&'a T> = &mut left_node.postorder();
[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/lib.rs:337:25
[INFO] [stdout]     |
[INFO] [stdout] 337 |                     let mut result : &mut Vec<&'a T> = &mut right_node.postorder();
[INFO] [stdout]     |                         ----^^^^^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:228:29
[INFO] [stdout]     |
[INFO] [stdout] 228 |                         let mut result : &mut Vec<&'a T> = &mut left_node.preorder();
[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/lib.rs:247:29
[INFO] [stdout]     |
[INFO] [stdout] 247 |                         let mut result : &mut Vec<&'a T> = &mut right_node.preorder();
[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/lib.rs:277:21
[INFO] [stdout]     |
[INFO] [stdout] 277 |                 let mut result : &mut Vec<&'a T> = &mut left_node.inorder();
[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/lib.rs:296:21
[INFO] [stdout]     |
[INFO] [stdout] 296 |                 let mut result : &mut Vec<&'a T> = &mut right_node.inorder();
[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/lib.rs:318:25
[INFO] [stdout]     |
[INFO] [stdout] 318 |                     let mut result : &mut Vec<&'a T> = &mut left_node.postorder();
[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/lib.rs:337:25
[INFO] [stdout]     |
[INFO] [stdout] 337 |                     let mut result : &mut Vec<&'a T> = &mut right_node.postorder();
[INFO] [stdout]     |                         ----^^^^^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:223:29
[INFO] [stdout]     |
[INFO] [stdout] 223 |                         let mut result : &mut Vec<&'a T> = &mut left_node.preorder();
[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/main.rs:242:29
[INFO] [stdout]     |
[INFO] [stdout] 242 |                         let mut result : &mut Vec<&'a T> = &mut right_node.preorder();
[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/main.rs:272:21
[INFO] [stdout]     |
[INFO] [stdout] 272 |                 let mut result : &mut Vec<&'a T> = &mut left_node.inorder();
[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/main.rs:291:21
[INFO] [stdout]     |
[INFO] [stdout] 291 |                 let mut result : &mut Vec<&'a T> = &mut right_node.inorder();
[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/main.rs:313:25
[INFO] [stdout]     |
[INFO] [stdout] 313 |                     let mut result : &mut Vec<&'a T> = &mut left_node.postorder();
[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/main.rs:332:25
[INFO] [stdout]     |
[INFO] [stdout] 332 |                     let mut result : &mut Vec<&'a T> = &mut right_node.postorder();
[INFO] [stdout]     |                         ----^^^^^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:223:29
[INFO] [stdout]     |
[INFO] [stdout] 223 |                         let mut result : &mut Vec<&'a T> = &mut left_node.preorder();
[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/main.rs:242:29
[INFO] [stdout]     |
[INFO] [stdout] 242 |                         let mut result : &mut Vec<&'a T> = &mut right_node.preorder();
[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/main.rs:272:21
[INFO] [stdout]     |
[INFO] [stdout] 272 |                 let mut result : &mut Vec<&'a T> = &mut left_node.inorder();
[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/main.rs:291:21
[INFO] [stdout]     |
[INFO] [stdout] 291 |                 let mut result : &mut Vec<&'a T> = &mut right_node.inorder();
[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/main.rs:313:25
[INFO] [stdout]     |
[INFO] [stdout] 313 |                     let mut result : &mut Vec<&'a T> = &mut left_node.postorder();
[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/main.rs:332:25
[INFO] [stdout]     |
[INFO] [stdout] 332 |                     let mut result : &mut Vec<&'a T> = &mut right_node.postorder();
[INFO] [stdout]     |                         ----^^^^^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.99s
[INFO] running `Command { std: "docker" "inspect" "1d6ff36fc8e9ddea2f067dd13d1dafdb97fe06465a8a2fff4583318ed635979f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1d6ff36fc8e9ddea2f067dd13d1dafdb97fe06465a8a2fff4583318ed635979f", kill_on_drop: false }`
[INFO] [stdout] 1d6ff36fc8e9ddea2f067dd13d1dafdb97fe06465a8a2fff4583318ed635979f