[INFO] cloning repository https://github.com/wyhhh/vec_list
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/wyhhh/vec_list" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwyhhh%2Fvec_list", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwyhhh%2Fvec_list'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 54cdf5eb83ed18b3919f6d45b10b10e4c9e0acf1
[INFO] checking wyhhh/vec_list against master#03eb45452305f2d52348279d0caa5fc1f12c438d for pr-138176
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwyhhh%2Fvec_list" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/wyhhh/vec_list on toolchain 03eb45452305f2d52348279d0caa5fc1f12c438d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+03eb45452305f2d52348279d0caa5fc1f12c438d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/wyhhh/vec_list
[INFO] finished tweaking git repo https://github.com/wyhhh/vec_list
[INFO] tweaked toml for git repo https://github.com/wyhhh/vec_list written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/wyhhh/vec_list 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" "+03eb45452305f2d52348279d0caa5fc1f12c438d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+03eb45452305f2d52348279d0caa5fc1f12c438d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0bb2a79c5adbe4b75830900ef4f40619e8973d067d739cc3a96d033307cef9b1
[INFO] running `Command { std: "docker" "start" "-a" "0bb2a79c5adbe4b75830900ef4f40619e8973d067d739cc3a96d033307cef9b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0bb2a79c5adbe4b75830900ef4f40619e8973d067d739cc3a96d033307cef9b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0bb2a79c5adbe4b75830900ef4f40619e8973d067d739cc3a96d033307cef9b1", kill_on_drop: false }`
[INFO] [stdout] 0bb2a79c5adbe4b75830900ef4f40619e8973d067d739cc3a96d033307cef9b1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+03eb45452305f2d52348279d0caa5fc1f12c438d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 46bd337a31a3c11763a33ab9b7db630f8ff2156f01497ab2781ed93db09315fb
[INFO] running `Command { std: "docker" "start" "-a" "46bd337a31a3c11763a33ab9b7db630f8ff2156f01497ab2781ed93db09315fb", kill_on_drop: false }`
[INFO] [stderr]     Checking vec_list v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:139:48
[INFO] [stdout]     |
[INFO] [stdout] 139 |                     unsafe { self.get_slot_mut(unsafe { self.tail.unwrap_unchecked() }) };
[INFO] [stdout]     |                     ------                     ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     because it's nested under this `unsafe` block
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:208:48
[INFO] [stdout]     |
[INFO] [stdout] 208 |                     unsafe { self.get_slot_mut(unsafe { self.head.unwrap_unchecked() }) };
[INFO] [stdout]     |                     ------                     ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     because it's nested under this `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:139:48
[INFO] [stdout]     |
[INFO] [stdout] 139 |                     unsafe { self.get_slot_mut(unsafe { self.tail.unwrap_unchecked() }) };
[INFO] [stdout]     |                     ------                     ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     because it's nested under this `unsafe` block
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:208:48
[INFO] [stdout]     |
[INFO] [stdout] 208 |                     unsafe { self.get_slot_mut(unsafe { self.head.unwrap_unchecked() }) };
[INFO] [stdout]     |                     ------                     ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     because it's nested under this `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `list` and `cap` are never read
[INFO] [stdout]  --> src/bounded.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct BoundedList<T> {
[INFO] [stdout]   |            ----------- fields in this struct
[INFO] [stdout] 7 |     list: VecList<T>,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 8 |     cap: usize,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `BoundedList` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add`, `len`, `is_empty`, and `iter` are never used
[INFO] [stdout]   --> src/bounded.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl<T> BoundedList<T> {
[INFO] [stdout]    | ---------------------- associated items in this implementation
[INFO] [stdout] 12 |     pub fn new(cap: usize) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 19 |     pub fn add(&mut self, val: T) {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 28 |     pub fn len(&self) -> usize {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 32 |     pub fn is_empty(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn iter(&self) -> Iter<T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `list` and `cap` are never read
[INFO] [stdout]  --> src/bounded.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct BoundedList<T> {
[INFO] [stdout]   |            ----------- fields in this struct
[INFO] [stdout] 7 |     list: VecList<T>,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 8 |     cap: usize,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `BoundedList` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add`, `len`, `is_empty`, and `iter` are never used
[INFO] [stdout]   --> src/bounded.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl<T> BoundedList<T> {
[INFO] [stdout]    | ---------------------- associated items in this implementation
[INFO] [stdout] 12 |     pub fn new(cap: usize) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 19 |     pub fn add(&mut self, val: T) {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 28 |     pub fn len(&self) -> usize {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 32 |     pub fn is_empty(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn iter(&self) -> Iter<T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let a = l.push_back(1);
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]  --> src/main.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let b = l.push_back(2);
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]  --> src/main.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let c = l.push_back(3);
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/main.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let c = l.push_front(3);
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/main.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let c = l.push_back(4);
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let a = l.push_back(1);
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]  --> src/main.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let b = l.push_back(2);
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]  --> src/main.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let c = l.push_back(3);
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/main.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let c = l.push_front(3);
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/main.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let c = l.push_back(4);
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.38s
[INFO] running `Command { std: "docker" "inspect" "46bd337a31a3c11763a33ab9b7db630f8ff2156f01497ab2781ed93db09315fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46bd337a31a3c11763a33ab9b7db630f8ff2156f01497ab2781ed93db09315fb", kill_on_drop: false }`
[INFO] [stdout] 46bd337a31a3c11763a33ab9b7db630f8ff2156f01497ab2781ed93db09315fb