[INFO] fetching crate colon 0.1.0...
[INFO] checking colon-0.1.0 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] extracting crate colon 0.1.0 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate colon 0.1.0 on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate colon 0.1.0
[INFO] finished tweaking crates.io crate colon 0.1.0
[INFO] tweaked toml for crates.io crate colon 0.1.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 3 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cced5d3a2e3b7ed5e3e8590a784528e5655546957b9c6ec58b09b2b868e86758
[INFO] running `Command { std: "docker" "start" "-a" "cced5d3a2e3b7ed5e3e8590a784528e5655546957b9c6ec58b09b2b868e86758", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cced5d3a2e3b7ed5e3e8590a784528e5655546957b9c6ec58b09b2b868e86758", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cced5d3a2e3b7ed5e3e8590a784528e5655546957b9c6ec58b09b2b868e86758", kill_on_drop: false }`
[INFO] [stdout] cced5d3a2e3b7ed5e3e8590a784528e5655546957b9c6ec58b09b2b868e86758
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f9a8caa35f8aca06b4760617e08f82ebf4c526f13ac02b1ba2f530ba37a2904a
[INFO] running `Command { std: "docker" "start" "-a" "f9a8caa35f8aca06b4760617e08f82ebf4c526f13ac02b1ba2f530ba37a2904a", kill_on_drop: false }`
[INFO] [stderr]     Checking colon v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/sorted_index.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 |     Ok(i) => {
[INFO] [stdout]    |        ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `chunk` is never used
[INFO] [stdout]  --> src/chunk.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn chunk<T: Clone>(v: Vec<T>, n: usize) -> Vec<Vec<T>> {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `compact` is never used
[INFO] [stdout]  --> src/compact.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn compact<T: Clone>(v: Vec<Option<T>>) -> Vec<T> {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `concat` is never used
[INFO] [stdout]  --> src/concat.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn concat<T: Clone>(v1: Vec<T>, v2: Vec<T>) -> Vec<T> {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `difference` is never used
[INFO] [stdout]  --> src/difference.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn difference<T: Clone + Eq>(v1: Vec<T>, v2: Vec<T>) -> Vec<T> {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `drop` is never used
[INFO] [stdout]  --> src/drop.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn drop<T: Clone>(v: Vec<T>, n: usize) -> Vec<T> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fill` is never used
[INFO] [stdout]  --> src/fill.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn fill<T: Clone>(v: Vec<T>, val: T) -> Vec<T> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `find_index` is never used
[INFO] [stdout]  --> src/find_index.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn find_index<T: Clone, F>(v: Vec<T>, f: F) -> usize
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `find_last_index` is never used
[INFO] [stdout]  --> src/find_last_index.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn find_last_index<T: Clone, F>(v: Vec<T>, f: F) -> usize
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first` is never used
[INFO] [stdout]  --> src/first.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn first<T: Clone>(v: Vec<T>) -> Option<T> {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `flatten` is never used
[INFO] [stdout]  --> src/flatten.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn flatten<T>(v: Vec<Vec<T>>) -> Vec<T> {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `from_pairs` is never used
[INFO] [stdout]  --> src/from_pairs.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn from_pairs<T: Clone>(v: Vec<(&str, T)>) -> HashMap<&str, T> {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `head` is never used
[INFO] [stdout]  --> src/head.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn head<T: Clone>(v: Vec<T>) -> Option<T> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `index_of` is never used
[INFO] [stdout]  --> src/index_of.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn index_of<T: Clone + PartialEq>(v: Vec<T>, val: T) -> usize {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `initial` is never used
[INFO] [stdout]  --> src/initial.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn initial<T: Clone>(mut v: Vec<T>) -> Vec<T> {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `intersection` is never used
[INFO] [stdout]  --> src/intersection.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn intersection<T: Clone + Eq>(v1: Vec<T>, v2: Vec<T>) -> Vec<T> {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `join` is never used
[INFO] [stdout]  --> src/join.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn join<T: Clone + ToString>(v: Vec<T>, sep: &str) -> String {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `last` is never used
[INFO] [stdout]  --> src/last.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn last<T: Clone>(v: Vec<T>) -> Option<T> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `last_index_of` is never used
[INFO] [stdout]  --> src/last_index_of.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn last_index_of<T: Clone + PartialEq + Ord>(v: Vec<T>, val: T) -> usize {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `nth` is never used
[INFO] [stdout]  --> src/nth.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn nth<T: Clone>(v: Vec<T>, idx: isize) -> Option<T> {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `pull` is never used
[INFO] [stdout]  --> src/pull.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn pull<T: PartialEq>(v: &mut Vec<T>, vals: Vec<T>) {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `pull_at` is never used
[INFO] [stdout]  --> src/pull_at.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn pull_at<T: PartialEq>(v: &mut Vec<T>, mut idxs: Vec<usize>) -> Vec<T> {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `remove` is never used
[INFO] [stdout]  --> src/remove.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn remove<T: Clone, F>(v: &mut Vec<T>, f: F) -> Vec<T>
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `reverse` is never used
[INFO] [stdout]  --> src/reverse.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn reverse<T: Clone>(v: Vec<T>) -> Vec<T> {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `slice` is never used
[INFO] [stdout]  --> src/slice.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn slice<T: Clone>(v: Vec<T>, start: usize, end: usize) -> Vec<T> {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sorted_index` is never used
[INFO] [stdout]  --> src/sorted_index.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn sorted_index<T: Clone + PartialEq + PartialOrd>(v: Vec<T>, val: T) -> usize {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sorted_last_index` is never used
[INFO] [stdout]  --> src/sorted_last_index.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn sorted_last_index<T: Clone + PartialEq + PartialOrd>(v: Vec<T>, val: T) -> usize {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sorted_uniq` is never used
[INFO] [stdout]  --> src/sorted_uniq.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn sorted_uniq<T: Clone + PartialEq + PartialOrd>(v: Vec<T>) -> Vec<T> {
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tail` is never used
[INFO] [stdout]  --> src/tail.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn tail<T: Clone>(v: Vec<T>) -> Vec<T> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take` is never used
[INFO] [stdout]  --> src/take.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn take<T: Clone>(v: Vec<T>, n: usize) -> Vec<T> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_right` is never used
[INFO] [stdout]  --> src/take_right.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn take_right<T: Clone>(v: Vec<T>, n: usize) -> Vec<T> {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `union` is never used
[INFO] [stdout]  --> src/union.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn union<T: Clone + PartialEq>(v1: Vec<T>, v2: Vec<T>) -> Vec<T> {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `unzip` is never used
[INFO] [stdout]  --> src/unzip.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn unzip<T: Clone>(v: Vec<Vec<T>>) -> Vec<Vec<T>> {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `without` is never used
[INFO] [stdout]  --> src/without.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn without<T: Clone + PartialEq>(v: Vec<T>, vals: Vec<T>) -> Vec<T> {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `xor` is never used
[INFO] [stdout]  --> src/xor.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn xor<T: Clone + Eq>(v1: Vec<T>, v2: Vec<T>) -> Vec<T> {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `zip` is never used
[INFO] [stdout]  --> src/zip.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn zip<T: Clone>(v: Vec<Vec<T>>) -> Vec<Vec<T>> {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add` is never used
[INFO] [stdout]  --> src/add.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn add<T: Signed + FromPrimitive>(v1: T, v2: T) -> T {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ceil` is never used
[INFO] [stdout]  --> src/ceil.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn ceil<T: Float + Signed + FromPrimitive>(v: T, precision: i32) -> T {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `divide` is never used
[INFO] [stdout]  --> src/divide.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn divide<T: Float + Signed + FromPrimitive>(dividend: T, divisor: T) -> T {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `floor` is never used
[INFO] [stdout]  --> src/floor.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn floor<T: Float + Signed + FromPrimitive>(v: T, precision: i32) -> T {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `max` is never used
[INFO] [stdout]  --> src/max.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn max<T: Copy + Ord>(v: Vec<T>) -> T {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mean` is never used
[INFO] [stdout]  --> src/mean.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn mean<T: Copy + Sum + Div + PartialEq + FromPrimitive + ToPrimitive>(v: Vec<T>) -> f64 {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `min` is never used
[INFO] [stdout]  --> src/min.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn min<T: Copy + Ord>(v: Vec<T>) -> T {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `multiply` is never used
[INFO] [stdout]  --> src/multiply.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn multiply<A, B>(v1: A, v2: B) -> f64
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `round` is never used
[INFO] [stdout]  --> src/round.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn round<T: Float + Signed + FromPrimitive>(v: T, precision: i32) -> T {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `subtract` is never used
[INFO] [stdout]  --> src/subtract.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn subtract<A, B>(v1: A, v2: B) -> f64
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum` is never used
[INFO] [stdout]  --> src/sum.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn sum<T: Copy + Sum + ToPrimitive>(v: Vec<T>) -> f64 {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 47 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/sorted_index.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 |     Ok(i) => {
[INFO] [stdout]    |        ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `head` is never used
[INFO] [stdout]  --> src/head.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn head<T: Clone>(v: Vec<T>) -> Option<T> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `index_of` is never used
[INFO] [stdout]  --> src/index_of.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn index_of<T: Clone + PartialEq>(v: Vec<T>, val: T) -> usize {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `last_index_of` is never used
[INFO] [stdout]  --> src/last_index_of.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn last_index_of<T: Clone + PartialEq + Ord>(v: Vec<T>, val: T) -> usize {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.52s
[INFO] running `Command { std: "docker" "inspect" "f9a8caa35f8aca06b4760617e08f82ebf4c526f13ac02b1ba2f530ba37a2904a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9a8caa35f8aca06b4760617e08f82ebf4c526f13ac02b1ba2f530ba37a2904a", kill_on_drop: false }`
[INFO] [stdout] f9a8caa35f8aca06b4760617e08f82ebf4c526f13ac02b1ba2f530ba37a2904a