[INFO] updating cached repository https://github.com/jramos14/Binary-Search-Tree
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8c5598a68c35fb07150343623512accd0811a259
[INFO] checking jramos14/Binary-Search-Tree against master#914adf04af1c1a984707f778da3d04590c03d144 for pr-72331
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjramos14%2FBinary-Search-Tree" "/workspace/builds/worker-10/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jramos14/Binary-Search-Tree on toolchain 914adf04af1c1a984707f778da3d04590c03d144
[INFO] running `"/workspace/cargo-home/bin/cargo" "+914adf04af1c1a984707f778da3d04590c03d144" "read-manifest" "--manifest-path" "Cargo.toml"`
[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-10/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 `"/workspace/cargo-home/bin/cargo" "+914adf04af1c1a984707f778da3d04590c03d144" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+914adf04af1c1a984707f778da3d04590c03d144" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] acf88004656eb1b28cf2249f06fcc3d003d3d479baa324e9e884546536c21d82
[INFO] running `"docker" "start" "-a" "acf88004656eb1b28cf2249f06fcc3d003d3d479baa324e9e884546536c21d82"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]     Checking your v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:228:29
[INFO] [stderr]     |
[INFO] [stderr] 228 |                         let mut result : &mut Vec<&'a T> = &mut left_node.preorder();
[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/lib.rs:247:29
[INFO] [stderr]     |
[INFO] [stderr] 247 |                         let mut result : &mut Vec<&'a T> = &mut right_node.preorder();
[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/lib.rs:277:21
[INFO] [stderr]     |
[INFO] [stderr] 277 |                 let mut result : &mut Vec<&'a T> = &mut left_node.inorder();
[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/lib.rs:296:21
[INFO] [stderr]     |
[INFO] [stderr] 296 |                 let mut result : &mut Vec<&'a T> = &mut right_node.inorder();
[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/lib.rs:318:25
[INFO] [stderr]     |
[INFO] [stderr] 318 |                     let mut result : &mut Vec<&'a T> = &mut left_node.postorder();
[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/lib.rs:337:25
[INFO] [stderr]     |
[INFO] [stderr] 337 |                     let mut result : &mut Vec<&'a T> = &mut right_node.postorder();
[INFO] [stderr]     |                         ----^^^^^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: 6 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:228:29
[INFO] [stderr]     |
[INFO] [stderr] 228 |                         let mut result : &mut Vec<&'a T> = &mut left_node.preorder();
[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/lib.rs:247:29
[INFO] [stderr]     |
[INFO] [stderr] 247 |                         let mut result : &mut Vec<&'a T> = &mut right_node.preorder();
[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/lib.rs:277:21
[INFO] [stderr]     |
[INFO] [stderr] 277 |                 let mut result : &mut Vec<&'a T> = &mut left_node.inorder();
[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/lib.rs:296:21
[INFO] [stderr]     |
[INFO] [stderr] 296 |                 let mut result : &mut Vec<&'a T> = &mut right_node.inorder();
[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/lib.rs:318:25
[INFO] [stderr]     |
[INFO] [stderr] 318 |                     let mut result : &mut Vec<&'a T> = &mut left_node.postorder();
[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/lib.rs:337:25
[INFO] [stderr]     |
[INFO] [stderr] 337 |                     let mut result : &mut Vec<&'a T> = &mut right_node.postorder();
[INFO] [stderr]     |                         ----^^^^^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: 6 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:223:29
[INFO] [stderr]     |
[INFO] [stderr] 223 |                         let mut result : &mut Vec<&'a T> = &mut left_node.preorder();
[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/main.rs:242:29
[INFO] [stderr]     |
[INFO] [stderr] 242 |                         let mut result : &mut Vec<&'a T> = &mut right_node.preorder();
[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/main.rs:272:21
[INFO] [stderr]     |
[INFO] [stderr] 272 |                 let mut result : &mut Vec<&'a T> = &mut left_node.inorder();
[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/main.rs:291:21
[INFO] [stderr]     |
[INFO] [stderr] 291 |                 let mut result : &mut Vec<&'a T> = &mut right_node.inorder();
[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/main.rs:313:25
[INFO] [stderr]     |
[INFO] [stderr] 313 |                     let mut result : &mut Vec<&'a T> = &mut left_node.postorder();
[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/main.rs:332:25
[INFO] [stderr]     |
[INFO] [stderr] 332 |                     let mut result : &mut Vec<&'a T> = &mut right_node.postorder();
[INFO] [stderr]     |                         ----^^^^^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: 6 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:223:29
[INFO] [stderr]     |
[INFO] [stderr] 223 |                         let mut result : &mut Vec<&'a T> = &mut left_node.preorder();
[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/main.rs:242:29
[INFO] [stderr]     |
[INFO] [stderr] 242 |                         let mut result : &mut Vec<&'a T> = &mut right_node.preorder();
[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/main.rs:272:21
[INFO] [stderr]     |
[INFO] [stderr] 272 |                 let mut result : &mut Vec<&'a T> = &mut left_node.inorder();
[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/main.rs:291:21
[INFO] [stderr]     |
[INFO] [stderr] 291 |                 let mut result : &mut Vec<&'a T> = &mut right_node.inorder();
[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/main.rs:313:25
[INFO] [stderr]     |
[INFO] [stderr] 313 |                     let mut result : &mut Vec<&'a T> = &mut left_node.postorder();
[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/main.rs:332:25
[INFO] [stderr]     |
[INFO] [stderr] 332 |                     let mut result : &mut Vec<&'a T> = &mut right_node.postorder();
[INFO] [stderr]     |                         ----^^^^^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: 6 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.09s
[INFO] running `"docker" "inspect" "acf88004656eb1b28cf2249f06fcc3d003d3d479baa324e9e884546536c21d82"`
[INFO] running `"docker" "rm" "-f" "acf88004656eb1b28cf2249f06fcc3d003d3d479baa324e9e884546536c21d82"`
[INFO] [stdout] acf88004656eb1b28cf2249f06fcc3d003d3d479baa324e9e884546536c21d82