[INFO] cloning repository https://github.com/VaclavStebra/rust-book-references-and-borrowing
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/VaclavStebra/rust-book-references-and-borrowing" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FVaclavStebra%2Frust-book-references-and-borrowing", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FVaclavStebra%2Frust-book-references-and-borrowing'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6a69d6a3a909d36b8b69bc865641a6b3053066d0
[INFO] testing VaclavStebra/rust-book-references-and-borrowing against master#5d5ff84130da0d74c6ece368dbe821d8f83fa526 for pr-79296
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FVaclavStebra%2Frust-book-references-and-borrowing" "/workspace/builds/worker-14/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/VaclavStebra/rust-book-references-and-borrowing on toolchain 5d5ff84130da0d74c6ece368dbe821d8f83fa526
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5d5ff84130da0d74c6ece368dbe821d8f83fa526" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/VaclavStebra/rust-book-references-and-borrowing
[INFO] finished tweaking git repo https://github.com/VaclavStebra/rust-book-references-and-borrowing
[INFO] tweaked toml for git repo https://github.com/VaclavStebra/rust-book-references-and-borrowing written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate git repo https://github.com/VaclavStebra/rust-book-references-and-borrowing already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5d5ff84130da0d74c6ece368dbe821d8f83fa526" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+5d5ff84130da0d74c6ece368dbe821d8f83fa526" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2f93f0a813bd86a459b7914a19b40b9d0be9ab4d86321b1301ecefaf9bcf712b
[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" "2f93f0a813bd86a459b7914a19b40b9d0be9ab4d86321b1301ecefaf9bcf712b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2f93f0a813bd86a459b7914a19b40b9d0be9ab4d86321b1301ecefaf9bcf712b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2f93f0a813bd86a459b7914a19b40b9d0be9ab4d86321b1301ecefaf9bcf712b", kill_on_drop: false }`
[INFO] [stdout] 2f93f0a813bd86a459b7914a19b40b9d0be9ab4d86321b1301ecefaf9bcf712b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+5d5ff84130da0d74c6ece368dbe821d8f83fa526" "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] 56381533f2714c60517ee0bf84febe38b8e4b8dd0f5c3f64934eef8f2c93ca2a
[INFO] running `Command { std: "docker" "start" "-a" "56381533f2714c60517ee0bf84febe38b8e4b8dd0f5c3f64934eef8f2c93ca2a", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-book-references-and-borrowing v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/main.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let r1 = &mut s2;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.76s
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "56381533f2714c60517ee0bf84febe38b8e4b8dd0f5c3f64934eef8f2c93ca2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "56381533f2714c60517ee0bf84febe38b8e4b8dd0f5c3f64934eef8f2c93ca2a", kill_on_drop: false }`
[INFO] [stdout] 56381533f2714c60517ee0bf84febe38b8e4b8dd0f5c3f64934eef8f2c93ca2a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+5d5ff84130da0d74c6ece368dbe821d8f83fa526" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8daeec39b3cd24df93e2ea7606fd38a4fbc738f8f83433826fc00b8f15212252
[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" "8daeec39b3cd24df93e2ea7606fd38a4fbc738f8f83433826fc00b8f15212252", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-book-references-and-borrowing v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/main.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let r1 = &mut s2;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[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 0.73s
[INFO] running `Command { std: "docker" "inspect" "8daeec39b3cd24df93e2ea7606fd38a4fbc738f8f83433826fc00b8f15212252", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8daeec39b3cd24df93e2ea7606fd38a4fbc738f8f83433826fc00b8f15212252", kill_on_drop: false }`
[INFO] [stdout] 8daeec39b3cd24df93e2ea7606fd38a4fbc738f8f83433826fc00b8f15212252
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+5d5ff84130da0d74c6ece368dbe821d8f83fa526" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] ca5f87f2731f3c56a855bf3eee3ce3b27ae566cb6a80c76e1016da44ae36ee9b
[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" "ca5f87f2731f3c56a855bf3eee3ce3b27ae566cb6a80c76e1016da44ae36ee9b", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr] warning: unused variable: `r1`
[INFO] [stdout] running 0 tests
[INFO] [stderr]   --> src/main.rs:20:9
[INFO] [stdout] 
[INFO] [stderr]    |
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stderr] 20 |     let r1 = &mut s2;
[INFO] [stdout] 
[INFO] [stderr]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/rust_book_references_and_borrowing-6f294cf5be892e8f
[INFO] running `Command { std: "docker" "inspect" "ca5f87f2731f3c56a855bf3eee3ce3b27ae566cb6a80c76e1016da44ae36ee9b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ca5f87f2731f3c56a855bf3eee3ce3b27ae566cb6a80c76e1016da44ae36ee9b", kill_on_drop: false }`
[INFO] [stdout] ca5f87f2731f3c56a855bf3eee3ce3b27ae566cb6a80c76e1016da44ae36ee9b