[INFO] cloning repository https://github.com/fahrenkrug/rust_learn_book_chapter10
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/fahrenkrug/rust_learn_book_chapter10" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffahrenkrug%2Frust_learn_book_chapter10", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffahrenkrug%2Frust_learn_book_chapter10'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cc13fee7f25ce20d17d66c51965bf8daed82baeb
[INFO] testing fahrenkrug/rust_learn_book_chapter10 against master#432e145bd5a974c5b6f4dd9b352891bd7502b69d for pr-87041
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffahrenkrug%2Frust_learn_book_chapter10" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/fahrenkrug/rust_learn_book_chapter10 on toolchain 432e145bd5a974c5b6f4dd9b352891bd7502b69d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+432e145bd5a974c5b6f4dd9b352891bd7502b69d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/fahrenkrug/rust_learn_book_chapter10
[INFO] finished tweaking git repo https://github.com/fahrenkrug/rust_learn_book_chapter10
[INFO] tweaked toml for git repo https://github.com/fahrenkrug/rust_learn_book_chapter10 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/fahrenkrug/rust_learn_book_chapter10 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+432e145bd5a974c5b6f4dd9b352891bd7502b69d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+432e145bd5a974c5b6f4dd9b352891bd7502b69d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e1c7d3fcc42be8bba147fae85994dfaf845a4221b426cae18ebed11e294483a8
[INFO] running `Command { std: "docker" "start" "-a" "e1c7d3fcc42be8bba147fae85994dfaf845a4221b426cae18ebed11e294483a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e1c7d3fcc42be8bba147fae85994dfaf845a4221b426cae18ebed11e294483a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e1c7d3fcc42be8bba147fae85994dfaf845a4221b426cae18ebed11e294483a8", kill_on_drop: false }`
[INFO] [stdout] e1c7d3fcc42be8bba147fae85994dfaf845a4221b426cae18ebed11e294483a8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+432e145bd5a974c5b6f4dd9b352891bd7502b69d" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 42654bf4ecb2cfed5a2d02312a1affc9aea7c5dd7aadd774ea258c7dfb378a1b
[INFO] running `Command { std: "docker" "start" "-a" "42654bf4ecb2cfed5a2d02312a1affc9aea7c5dd7aadd774ea258c7dfb378a1b", kill_on_drop: false }`
[INFO] [stderr]    Compiling chapter_10_generics_traits_lifetimes v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/lifetime.rs:65:29
[INFO] [stdout]    |
[INFO] [stdout] 65 | fn longest2<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stdout]    |                             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `level`
[INFO] [stdout]   --> src/lifetime.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 82 |     fn level(&self) -> i32 {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `announce_and_return_part`
[INFO] [stdout]   --> src/lifetime.rs:87:8
[INFO] [stdout]    |
[INFO] [stdout] 87 |     fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `content`
[INFO] [stdout]    --> src/main.rs:114:9
[INFO] [stdout]     |
[INFO] [stdout] 114 |         content: String,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.65s
[INFO] running `Command { std: "docker" "inspect" "42654bf4ecb2cfed5a2d02312a1affc9aea7c5dd7aadd774ea258c7dfb378a1b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "42654bf4ecb2cfed5a2d02312a1affc9aea7c5dd7aadd774ea258c7dfb378a1b", kill_on_drop: false }`
[INFO] [stdout] 42654bf4ecb2cfed5a2d02312a1affc9aea7c5dd7aadd774ea258c7dfb378a1b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+432e145bd5a974c5b6f4dd9b352891bd7502b69d" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 185b6f407d5d81004d67278a4bc3586a7f1ee565fe4ceed0e6a3d250756a63e7
[INFO] running `Command { std: "docker" "start" "-a" "185b6f407d5d81004d67278a4bc3586a7f1ee565fe4ceed0e6a3d250756a63e7", kill_on_drop: false }`
[INFO] [stderr]    Compiling chapter_10_generics_traits_lifetimes v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/lifetime.rs:65:29
[INFO] [stdout]    |
[INFO] [stdout] 65 | fn longest2<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stdout]    |                             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `level`
[INFO] [stdout]   --> src/lifetime.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 82 |     fn level(&self) -> i32 {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `announce_and_return_part`
[INFO] [stdout]   --> src/lifetime.rs:87:8
[INFO] [stdout]    |
[INFO] [stdout] 87 |     fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `content`
[INFO] [stdout]    --> src/main.rs:114:9
[INFO] [stdout]     |
[INFO] [stdout] 114 |         content: String,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.51s
[INFO] running `Command { std: "docker" "inspect" "185b6f407d5d81004d67278a4bc3586a7f1ee565fe4ceed0e6a3d250756a63e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "185b6f407d5d81004d67278a4bc3586a7f1ee565fe4ceed0e6a3d250756a63e7", kill_on_drop: false }`
[INFO] [stdout] 185b6f407d5d81004d67278a4bc3586a7f1ee565fe4ceed0e6a3d250756a63e7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+432e145bd5a974c5b6f4dd9b352891bd7502b69d" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 0a3fe66ccf55889e01157e5500bcd59902648ec57d61124318797a8a97949c71
[INFO] running `Command { std: "docker" "start" "-a" "0a3fe66ccf55889e01157e5500bcd59902648ec57d61124318797a8a97949c71", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stdout] running 0 tests
[INFO] [stderr]   --> src/lifetime.rs:65:29
[INFO] [stdout] 
[INFO] [stderr]    |
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr] 65 | fn longest2<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stdout] 
[INFO] [stderr]    |                             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `level`
[INFO] [stderr]   --> src/lifetime.rs:82:8
[INFO] [stderr]    |
[INFO] [stderr] 82 |     fn level(&self) -> i32 {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `announce_and_return_part`
[INFO] [stderr]   --> src/lifetime.rs:87:8
[INFO] [stderr]    |
[INFO] [stderr] 87 |     fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `content`
[INFO] [stderr]    --> src/main.rs:114:9
[INFO] [stderr]     |
[INFO] [stderr] 114 |         content: String,
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 4 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/chapter_10_generics_traits_lifetimes-d9acff9b41466445)
[INFO] running `Command { std: "docker" "inspect" "0a3fe66ccf55889e01157e5500bcd59902648ec57d61124318797a8a97949c71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0a3fe66ccf55889e01157e5500bcd59902648ec57d61124318797a8a97949c71", kill_on_drop: false }`
[INFO] [stdout] 0a3fe66ccf55889e01157e5500bcd59902648ec57d61124318797a8a97949c71