[INFO] cloning repository https://github.com/leokang28/rust_crash_course
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/leokang28/rust_crash_course" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fleokang28%2Frust_crash_course", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fleokang28%2Frust_crash_course'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 839a09465ba49ca150a3c8b4fbbbc3768fa1d14c
[INFO] testing leokang28/rust_crash_course against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fleokang28%2Frust_crash_course" "/workspace/builds/worker-24/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-24/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/leokang28/rust_crash_course 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/leokang28/rust_crash_course
[INFO] finished tweaking git repo https://github.com/leokang28/rust_crash_course
[INFO] tweaked toml for git repo https://github.com/leokang28/rust_crash_course written to /workspace/builds/worker-24/source/Cargo.toml
[INFO] crate git repo https://github.com/leokang28/rust_crash_course 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] [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-24/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/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] [stdout] 341ff2a198da813b2e0fa1f774e6c40a73348b1ea60da955acb92de56a4e49a4
[INFO] running `Command { std: "docker" "start" "-a" "341ff2a198da813b2e0fa1f774e6c40a73348b1ea60da955acb92de56a4e49a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "341ff2a198da813b2e0fa1f774e6c40a73348b1ea60da955acb92de56a4e49a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "341ff2a198da813b2e0fa1f774e6c40a73348b1ea60da955acb92de56a4e49a4", kill_on_drop: false }`
[INFO] [stdout] 341ff2a198da813b2e0fa1f774e6c40a73348b1ea60da955acb92de56a4e49a4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/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] [stdout] 9081722f888c4bbc4d4823d287b47e53bc1650a267468877be1ed4171d7f1cbe
[INFO] running `Command { std: "docker" "start" "-a" "9081722f888c4bbc4d4823d287b47e53bc1650a267468877be1ed4171d7f1cbe", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling rust_crash_course v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `chars`
[INFO] [stdout]   --> src/byteliteral.rs:12:13
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let chars = arg.chars();
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_chars`
[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 dev [unoptimized + debuginfo] target(s) in 2.08s
[INFO] running `Command { std: "docker" "inspect" "9081722f888c4bbc4d4823d287b47e53bc1650a267468877be1ed4171d7f1cbe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9081722f888c4bbc4d4823d287b47e53bc1650a267468877be1ed4171d7f1cbe", kill_on_drop: false }`
[INFO] [stdout] 9081722f888c4bbc4d4823d287b47e53bc1650a267468877be1ed4171d7f1cbe
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/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] 4e17421d31909182608ab94f72d7b24e77ce097fdca44b175e4f8c3a7832c812
[INFO] running `Command { std: "docker" "start" "-a" "4e17421d31909182608ab94f72d7b24e77ce097fdca44b175e4f8c3a7832c812", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling rust_crash_course v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `chars`
[INFO] [stdout]   --> src/byteliteral.rs:12:13
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let chars = arg.chars();
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_chars`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `use_vale`
[INFO] [stdout]   --> examples/borrow.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn use_vale(v: &Foo) {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.39s
[INFO] running `Command { std: "docker" "inspect" "4e17421d31909182608ab94f72d7b24e77ce097fdca44b175e4f8c3a7832c812", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4e17421d31909182608ab94f72d7b24e77ce097fdca44b175e4f8c3a7832c812", kill_on_drop: false }`
[INFO] [stdout] 4e17421d31909182608ab94f72d7b24e77ce097fdca44b175e4f8c3a7832c812
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/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] [stdout] 9d1c9a49e7ee80a0a703aab6735e29f506c9c75a480b2ff362bacc3b603b80bc
[INFO] running `Command { std: "docker" "start" "-a" "9d1c9a49e7ee80a0a703aab6735e29f506c9c75a480b2ff362bacc3b603b80bc", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: function is never used: `use_vale`
[INFO] [stderr]   --> examples/borrow.rs:16:4
[INFO] [stderr]    |
[INFO] [stderr] 16 | fn use_vale(v: &Foo) {
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `chars`
[INFO] [stderr]   --> src/byteliteral.rs:12:13
[INFO] [stderr]    |
[INFO] [stderr] 12 |         let chars = arg.chars();
[INFO] [stderr]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_chars`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_crash_course` (example "borrow") generated 1 warning
[INFO] [stderr] warning: `rust_crash_course` (bin "rust_crash_course" test) generated 1 warning
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.58s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rust_crash_course-3ddeba9f6a4051a4)
[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" "9d1c9a49e7ee80a0a703aab6735e29f506c9c75a480b2ff362bacc3b603b80bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9d1c9a49e7ee80a0a703aab6735e29f506c9c75a480b2ff362bacc3b603b80bc", kill_on_drop: false }`
[INFO] [stdout] 9d1c9a49e7ee80a0a703aab6735e29f506c9c75a480b2ff362bacc3b603b80bc