[INFO] cloning repository https://github.com/simpcl/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/simpcl/learning_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsimpcl%2Flearning_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsimpcl%2Flearning_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2718991defd52ab4c5aeeafdd7cb668ae4d0d391
[INFO] testing simpcl/learning_rust against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsimpcl%2Flearning_rust" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/simpcl/learning_rust on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/simpcl/learning_rust
[INFO] finished tweaking git repo https://github.com/simpcl/learning_rust
[INFO] tweaked toml for git repo https://github.com/simpcl/learning_rust written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/simpcl/learning_rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 5225757fbcd779559a39860deb8a2839d44bc156fcf4dc9b8c61fd3e997678ff
[INFO] running `Command { std: "docker" "start" "-a" "5225757fbcd779559a39860deb8a2839d44bc156fcf4dc9b8c61fd3e997678ff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5225757fbcd779559a39860deb8a2839d44bc156fcf4dc9b8c61fd3e997678ff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5225757fbcd779559a39860deb8a2839d44bc156fcf4dc9b8c61fd3e997678ff", kill_on_drop: false }`
[INFO] [stdout] 5225757fbcd779559a39860deb8a2839d44bc156fcf4dc9b8c61fd3e997678ff
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] cd2e9e30e1223b7ff61b2aa5ed504a7aed15888b0799ec1d30ab8b55cd91bfad
[INFO] running `Command { std: "docker" "start" "-a" "cd2e9e30e1223b7ff61b2aa5ed504a7aed15888b0799ec1d30ab8b55cd91bfad", kill_on_drop: false }`
[INFO] [stderr]    Compiling abc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]  --> src/tree/trie.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn new_trie(n: usize) -> Trie {
[INFO] [stdout]   |             ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `remove_duplicates`
[INFO] [stdout]  --> src/array/dup.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn remove_duplicates(nums: &mut Vec<i32>) -> usize {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `remove_duplicates2`
[INFO] [stdout]   --> src/array/dup.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn remove_duplicates2(nums: &mut Vec<i32>) -> usize {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `bubble_sort`
[INFO] [stdout]  --> src/array/sort.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn bubble_sort(nums: &mut Vec<i32>) {
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Trie`
[INFO] [stdout]  --> src/tree/trie.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Trie {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `new_trie`
[INFO] [stdout]  --> src/tree/trie.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn new_trie(n: usize) -> Trie {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `extend`
[INFO] [stdout]   --> src/tree/trie.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn extend(&mut self) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert`
[INFO] [stdout]   --> src/tree/trie.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn insert(&mut self, s: &str) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `search`
[INFO] [stdout]   --> src/tree/trie.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn search(&self, s: &str) -> usize {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.54s
[INFO] running `Command { std: "docker" "inspect" "cd2e9e30e1223b7ff61b2aa5ed504a7aed15888b0799ec1d30ab8b55cd91bfad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cd2e9e30e1223b7ff61b2aa5ed504a7aed15888b0799ec1d30ab8b55cd91bfad", kill_on_drop: false }`
[INFO] [stdout] cd2e9e30e1223b7ff61b2aa5ed504a7aed15888b0799ec1d30ab8b55cd91bfad
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b6b628d37ae8d79e5141aa73d567f432328a21ec0343c7d44e28cb8eaca0a6a0
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "b6b628d37ae8d79e5141aa73d567f432328a21ec0343c7d44e28cb8eaca0a6a0", kill_on_drop: false }`
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]  --> src/tree/trie.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn new_trie(n: usize) -> Trie {
[INFO] [stdout]   |             ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling abc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `remove_duplicates`
[INFO] [stdout]  --> src/array/dup.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn remove_duplicates(nums: &mut Vec<i32>) -> usize {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `remove_duplicates2`
[INFO] [stdout]   --> src/array/dup.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn remove_duplicates2(nums: &mut Vec<i32>) -> usize {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `bubble_sort`
[INFO] [stdout]  --> src/array/sort.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn bubble_sort(nums: &mut Vec<i32>) {
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Trie`
[INFO] [stdout]  --> src/tree/trie.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Trie {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `new_trie`
[INFO] [stdout]  --> src/tree/trie.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn new_trie(n: usize) -> Trie {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `extend`
[INFO] [stdout]   --> src/tree/trie.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn extend(&mut self) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert`
[INFO] [stdout]   --> src/tree/trie.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn insert(&mut self, s: &str) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `search`
[INFO] [stdout]   --> src/tree/trie.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn search(&self, s: &str) -> usize {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]  --> src/tree/trie.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn new_trie(n: usize) -> Trie {
[INFO] [stdout]   |             ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.23s
[INFO] running `Command { std: "docker" "inspect" "b6b628d37ae8d79e5141aa73d567f432328a21ec0343c7d44e28cb8eaca0a6a0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b6b628d37ae8d79e5141aa73d567f432328a21ec0343c7d44e28cb8eaca0a6a0", kill_on_drop: false }`
[INFO] [stdout] b6b628d37ae8d79e5141aa73d567f432328a21ec0343c7d44e28cb8eaca0a6a0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 321a34e9e79567553a471659baef9ecf99712e38a8e8e740f2e8dfeffe7d6ddf
[INFO] running `Command { std: "docker" "start" "-a" "321a34e9e79567553a471659baef9ecf99712e38a8e8e740f2e8dfeffe7d6ddf", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stderr]  --> src/tree/trie.rs:6:13
[INFO] [stderr]   |
[INFO] [stderr] 6 | fn new_trie(n: usize) -> Trie {
[INFO] [stderr]   |             ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `remove_duplicates`
[INFO] [stderr]  --> src/array/dup.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn remove_duplicates(nums: &mut Vec<i32>) -> usize {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `remove_duplicates2`
[INFO] [stderr]   --> src/array/dup.rs:16:8
[INFO] [stderr]    |
[INFO] [stderr] 16 | pub fn remove_duplicates2(nums: &mut Vec<i32>) -> usize {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `bubble_sort`
[INFO] [stderr]  --> src/array/sort.rs:1:4
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn bubble_sort(nums: &mut Vec<i32>) {
[INFO] [stderr]   |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Trie`
[INFO] [stderr]  --> src/tree/trie.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | struct Trie {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `new_trie`
[INFO] [stderr]  --> src/tree/trie.rs:6:4
[INFO] [stderr]   |
[INFO] [stderr] 6 | fn new_trie(n: usize) -> Trie {
[INFO] [stderr]   |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `extend`
[INFO] [stderr]   --> src/tree/trie.rs:14:8
[INFO] [stderr]    |
[INFO] [stderr] 14 |     fn extend(&mut self) {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `insert`
[INFO] [stderr]   --> src/tree/trie.rs:23:8
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn insert(&mut self, s: &str) {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `search`
[INFO] [stderr]   --> src/tree/trie.rs:41:8
[INFO] [stderr]    |
[INFO] [stderr] 41 |     fn search(&self, s: &str) -> usize {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `abc` (lib) generated 9 warnings
[INFO] [stderr] warning: `abc` (lib test) generated 1 warning (1 duplicate)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/abc-be73fc09a88534f2)
[INFO] [stdout] running 6 tests
[INFO] [stdout] test array::dup::tests::remove_duplicates_test ... ok
[INFO] [stdout] test array::sort::tests::bubble_sort_test ... ok
[INFO] [stdout] test tree::trie::tests::test_insert ... ok
[INFO] [stdout] test tests::it_works ... ok
[INFO] [stdout] test tree::trie::tests::test_search ... ok
[INFO] [stderr]    Doc-tests abc
[INFO] [stdout] test array::dup::tests::remove_duplicates2_test ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.03s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "321a34e9e79567553a471659baef9ecf99712e38a8e8e740f2e8dfeffe7d6ddf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "321a34e9e79567553a471659baef9ecf99712e38a8e8e740f2e8dfeffe7d6ddf", kill_on_drop: false }`
[INFO] [stdout] 321a34e9e79567553a471659baef9ecf99712e38a8e8e740f2e8dfeffe7d6ddf