[INFO] cloning repository https://github.com/thTs0ustas/rust_course
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/thTs0ustas/rust_course" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FthTs0ustas%2Frust_course", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FthTs0ustas%2Frust_course'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e8c8592f31edd7ea1360e597880c3ab56417d36a
[INFO] checking thTs0ustas/rust_course against try#ad93f57d532978d6739002a21bc66b45ed22f998 for pr-155418
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FthTs0ustas%2Frust_course" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/thTs0ustas/rust_course
[INFO] finished tweaking git repo https://github.com/thTs0ustas/rust_course
[INFO] tweaked toml for git repo https://github.com/thTs0ustas/rust_course written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/thTs0ustas/rust_course on toolchain ad93f57d532978d6739002a21bc66b45ed22f998
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ad93f57d532978d6739002a21bc66b45ed22f998" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/thTs0ustas/rust_course 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" "+ad93f57d532978d6739002a21bc66b45ed22f998" "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-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+ad93f57d532978d6739002a21bc66b45ed22f998" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 075ae9dcf101f72bf9ed1a100ae7496cd9f425efdd699999da9a4f6c806b3e0c
[INFO] running `Command { std: "docker" "start" "-a" "075ae9dcf101f72bf9ed1a100ae7496cd9f425efdd699999da9a4f6c806b3e0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "075ae9dcf101f72bf9ed1a100ae7496cd9f425efdd699999da9a4f6c806b3e0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "075ae9dcf101f72bf9ed1a100ae7496cd9f425efdd699999da9a4f6c806b3e0c", kill_on_drop: false }`
[INFO] [stdout] 075ae9dcf101f72bf9ed1a100ae7496cd9f425efdd699999da9a4f6c806b3e0c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+ad93f57d532978d6739002a21bc66b45ed22f998" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5f20cd5b4bb6997d6bf59bb92f8c992f2bfc225e2e8bf481120bbdda9b14d466
[INFO] running `Command { std: "docker" "start" "-a" "5f20cd5b4bb6997d6bf59bb92f8c992f2bfc225e2e8bf481120bbdda9b14d466", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.87
[INFO] [stderr]    Compiling unicode-ident v1.0.13
[INFO] [stderr]    Compiling libc v0.2.159
[INFO] [stderr]    Compiling quote v1.0.37
[INFO] [stderr]     Checking getrandom v0.2.15
[INFO] [stderr]    Compiling syn v2.0.79
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]    Compiling zerocopy-derive v0.7.35
[INFO] [stderr]     Checking zerocopy v0.7.35
[INFO] [stderr]     Checking ppv-lite86 v0.2.20
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking rust_course v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `move_elements` is never used
[INFO] [stdout]   --> src/iterators/iterator_fn.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn move_elements<T>(list: Vec<T>, destination: &mut Vec<T>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `explode` is never used
[INFO] [stdout]   --> src/iterators/iterator_fn.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub fn explode(list: &[String]) -> Vec<Vec<String>> {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `find_element_or` is never used
[INFO] [stdout]   --> src/iterators/iterator_fn.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub fn find_element_or(list: &[String], pattern: &str, fallback: String) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `last_language` is never used
[INFO] [stdout]   --> src/lifetimes/lifetimes_examples.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn last_language(languages: &[String]) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_language` is never used
[INFO] [stdout]   --> src/lifetimes/lifetimes_examples.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub fn longest_language<'a>(lang_1: &'a str, lang_2: &'a str) -> &'a str {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `move_elements` is never used
[INFO] [stdout]   --> src/iterators/iterator_fn.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn move_elements<T>(list: Vec<T>, destination: &mut Vec<T>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `explode` is never used
[INFO] [stdout]   --> src/iterators/iterator_fn.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub fn explode(list: &[String]) -> Vec<Vec<String>> {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `find_element_or` is never used
[INFO] [stdout]   --> src/iterators/iterator_fn.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub fn find_element_or(list: &[String], pattern: &str, fallback: String) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `last_language` is never used
[INFO] [stdout]   --> src/lifetimes/lifetimes_examples.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn last_language(languages: &[String]) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_language` is never used
[INFO] [stdout]   --> src/lifetimes/lifetimes_examples.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub fn longest_language<'a>(lang_1: &'a str, lang_2: &'a str) -> &'a str {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.64s
[INFO] running `Command { std: "docker" "inspect" "5f20cd5b4bb6997d6bf59bb92f8c992f2bfc225e2e8bf481120bbdda9b14d466", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5f20cd5b4bb6997d6bf59bb92f8c992f2bfc225e2e8bf481120bbdda9b14d466", kill_on_drop: false }`
[INFO] [stdout] 5f20cd5b4bb6997d6bf59bb92f8c992f2bfc225e2e8bf481120bbdda9b14d466