[INFO] cloning repository https://github.com/z23cc/RustCode
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/z23cc/RustCode" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fz23cc%2FRustCode", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fz23cc%2FRustCode'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 006fd82c3e563d9590e2fb354e322f2fdcd6a3e1
[INFO] checking z23cc/RustCode against master#cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c for pr-143170
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fz23cc%2FRustCode" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/z23cc/RustCode
[INFO] finished tweaking git repo https://github.com/z23cc/RustCode
[INFO] tweaked toml for git repo https://github.com/z23cc/RustCode written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/z23cc/RustCode on toolchain cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/z23cc/RustCode already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 369dcb17eb9fe702d73811f0a08e46b0a32d8b1a8fbc89cb38e7988151500407
[INFO] running `Command { std: "docker" "start" "-a" "369dcb17eb9fe702d73811f0a08e46b0a32d8b1a8fbc89cb38e7988151500407", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "369dcb17eb9fe702d73811f0a08e46b0a32d8b1a8fbc89cb38e7988151500407", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "369dcb17eb9fe702d73811f0a08e46b0a32d8b1a8fbc89cb38e7988151500407", kill_on_drop: false }`
[INFO] [stdout] 369dcb17eb9fe702d73811f0a08e46b0a32d8b1a8fbc89cb38e7988151500407
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 947bb5d1ddf69dd6eb39c93862d9ab086cadb8948a1c721d80e5c8e0fbc93444
[INFO] running `Command { std: "docker" "start" "-a" "947bb5d1ddf69dd6eb39c93862d9ab086cadb8948a1c721d80e5c8e0fbc93444", kill_on_drop: false }`
[INFO] [stderr]     Checking Leetcode v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/leetcode/p0019_remove_nth_from_end/solution_functional.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let mut nodes: Vec<_> = std::iter::successors(head.as_ref(), |node| node.next.as_ref())
[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/leetcode/functional_practice/iterator_basics.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let mut iter = vec.iter();
[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/leetcode/p0019_remove_nth_from_end/solution_functional.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let mut nodes: Vec<_> = std::iter::successors(head.as_ref(), |node| node.next.as_ref())
[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/leetcode/functional_practice/iterator_basics.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let mut iter = vec.iter();
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.69s
[INFO] running `Command { std: "docker" "inspect" "947bb5d1ddf69dd6eb39c93862d9ab086cadb8948a1c721d80e5c8e0fbc93444", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "947bb5d1ddf69dd6eb39c93862d9ab086cadb8948a1c721d80e5c8e0fbc93444", kill_on_drop: false }`
[INFO] [stdout] 947bb5d1ddf69dd6eb39c93862d9ab086cadb8948a1c721d80e5c8e0fbc93444