[INFO] cloning repository https://github.com/darylhjd/learning-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/darylhjd/learning-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdarylhjd%2Flearning-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdarylhjd%2Flearning-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8b539e1230978bf3e7259487667214072f9fb01a
[INFO] checking darylhjd/learning-rust against master#5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdarylhjd%2Flearning-rust" "/workspace/builds/worker-10/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/darylhjd/learning-rust on toolchain 5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/darylhjd/learning-rust
[INFO] finished tweaking git repo https://github.com/darylhjd/learning-rust
[INFO] tweaked toml for git repo https://github.com/darylhjd/learning-rust written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/darylhjd/learning-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 181907de1ad4423e74892f0c1b822b487e2886a1998eb4ebd8d0f009f7c78e4a
[INFO] running `Command { std: "docker" "start" "-a" "181907de1ad4423e74892f0c1b822b487e2886a1998eb4ebd8d0f009f7c78e4a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "181907de1ad4423e74892f0c1b822b487e2886a1998eb4ebd8d0f009f7c78e4a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "181907de1ad4423e74892f0c1b822b487e2886a1998eb4ebd8d0f009f7c78e4a", kill_on_drop: false }`
[INFO] [stdout] 181907de1ad4423e74892f0c1b822b487e2886a1998eb4ebd8d0f009f7c78e4a
[INFO] running `Command { std: "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" "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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 864aa49f54865e7e2fbd04c665a02186f4bce64dc85489bc44c65675e039f377
[INFO] running `Command { std: "docker" "start" "-a" "864aa49f54865e7e2fbd04c665a02186f4bce64dc85489bc44c65675e039f377", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.27
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.73
[INFO] [stderr]    Compiling serde_derive v1.0.126
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling serde v1.0.126
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]     Checking itoa v0.4.7
[INFO] [stderr]     Checking quick-xml v0.22.0
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking learning-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `dedup`, `filter`, `sum`
[INFO] [stdout]  --> src/hw01/tests_provided.rs:1:23
[INFO] [stdout]   |
[INFO] [stdout] 1 | use super::problem1::{dedup, filter, sum};
[INFO] [stdout]   |                       ^^^^^  ^^^^^^  ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::problem2::mat_mult`
[INFO] [stdout]  --> src/hw01/tests_provided.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use super::problem2::mat_mult;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::problem3::sieve`
[INFO] [stdout]  --> src/hw01/tests_provided.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use super::problem3::sieve;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Peg`, `hanoi`
[INFO] [stdout]  --> src/hw01/tests_provided.rs:4:23
[INFO] [stdout]   |
[INFO] [stdout] 4 | use super::problem4::{hanoi, Peg};
[INFO] [stdout]   |                       ^^^^^  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sum`
[INFO] [stdout]  --> src/hw01/problem1.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn sum(slice: &[i32]) -> i32 {
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `dedup`
[INFO] [stdout]  --> src/hw01/problem1.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn dedup(vs: &Vec<i32>) -> Vec<i32> {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `filter`
[INFO] [stdout]   --> src/hw01/problem1.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub fn filter(vs: &Vec<i32>, pred: &dyn Fn(i32) -> bool) -> Vec<i32> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Matrix`
[INFO] [stdout]  --> src/hw01/problem2.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub type Matrix = Vec<Vec<f32>>;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `mat_mult`
[INFO] [stdout]  --> src/hw01/problem2.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn mat_mult(mat1: &Matrix, mat2: &Matrix) -> Matrix {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sieve`
[INFO] [stdout]  --> src/hw01/problem3.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn sieve(n: u32) -> Vec<u32> {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `A`
[INFO] [stdout]  --> src/hw01/problem4.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     A,
[INFO] [stdout]   |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `B`
[INFO] [stdout]  --> src/hw01/problem4.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     B,
[INFO] [stdout]   |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `C`
[INFO] [stdout]   --> src/hw01/problem4.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     C,
[INFO] [stdout]    |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Move`
[INFO] [stdout]   --> src/hw01/problem4.rs:14:1
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub type Move = (Peg, Peg);
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `hanoi`
[INFO] [stdout]   --> src/hw01/problem4.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub fn hanoi(num_discs: u32, src: Peg, aux: Peg, dst: Peg) -> Vec<Move> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `More`
[INFO] [stdout]  --> src/hw02/first.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     More(Box<Node>),
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Empty`
[INFO] [stdout]  --> src/hw02/first.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Empty,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/hw02/first.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert`
[INFO] [stdout]   --> src/hw02/first.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 |     pub fn insert(&mut self, element: i32) -> bool {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `search`
[INFO] [stdout]   --> src/hw02/first.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 34 |     pub fn search(&self, element: i32) -> bool {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert`
[INFO] [stdout]   --> src/hw02/first.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 40 |     fn insert(&mut self, element: i32) -> bool {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `search`
[INFO] [stdout]   --> src/hw02/first.rs:64:8
[INFO] [stdout]    |
[INFO] [stdout] 64 |     fn search(&self, element: i32) -> bool {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/hw03/second.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert`
[INFO] [stdout]   --> src/hw03/second.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn insert(&mut self, element: T) -> bool {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `search`
[INFO] [stdout]   --> src/hw03/second.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 |     pub fn search(&self, element: T) -> bool {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 25 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 22.24s
[INFO] running `Command { std: "docker" "inspect" "864aa49f54865e7e2fbd04c665a02186f4bce64dc85489bc44c65675e039f377", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "864aa49f54865e7e2fbd04c665a02186f4bce64dc85489bc44c65675e039f377", kill_on_drop: false }`
[INFO] [stdout] 864aa49f54865e7e2fbd04c665a02186f4bce64dc85489bc44c65675e039f377