[INFO] cloning repository https://github.com/valekar/rust-book
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/valekar/rust-book" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvalekar%2Frust-book", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvalekar%2Frust-book'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2eeae0ed967ea63e698198235aa39cf767ba7851
[INFO] testing valekar/rust-book against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvalekar%2Frust-book" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/valekar/rust-book on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/valekar/rust-book
[INFO] finished tweaking git repo https://github.com/valekar/rust-book
[INFO] tweaked toml for git repo https://github.com/valekar/rust-book written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/valekar/rust-book already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "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-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b99dfc1faf8278cfdb6bd7100bf04e5aa2b6c69534119d43c5950b5496925cad
[INFO] running `Command { std: "docker" "start" "-a" "b99dfc1faf8278cfdb6bd7100bf04e5aa2b6c69534119d43c5950b5496925cad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b99dfc1faf8278cfdb6bd7100bf04e5aa2b6c69534119d43c5950b5496925cad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b99dfc1faf8278cfdb6bd7100bf04e5aa2b6c69534119d43c5950b5496925cad", kill_on_drop: false }`
[INFO] [stdout] b99dfc1faf8278cfdb6bd7100bf04e5aa2b6c69534119d43c5950b5496925cad
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 874e70fbed53142d5f3f5958d678380b8fa54eed363f239b660f0892dd897670
[INFO] running `Command { std: "docker" "start" "-a" "874e70fbed53142d5f3f5958d678380b8fa54eed363f239b660f0892dd897670", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling chap-3 v0.1.0 (/opt/rustwide/workdir/chap-3)
[INFO] [stderr]    Compiling chap-4 v0.1.0 (/opt/rustwide/workdir/chap-4)
[INFO] [stderr]    Compiling chap-1 v0.1.0 (/opt/rustwide/workdir/chap-1)
[INFO] [stdout] warning: unused variable: `s3`
[INFO] [stdout]   --> chap-4/src/main.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let s3 = &mut s1;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s3`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s4`
[INFO] [stdout]   --> chap-4/src/main.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let s4 = &mut s1;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s4`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling chap-2 v0.1.0 (/opt/rustwide/workdir/chap-2)
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> chap-2/src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::error::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` 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 5.49s
[INFO] running `Command { std: "docker" "inspect" "874e70fbed53142d5f3f5958d678380b8fa54eed363f239b660f0892dd897670", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "874e70fbed53142d5f3f5958d678380b8fa54eed363f239b660f0892dd897670", kill_on_drop: false }`
[INFO] [stdout] 874e70fbed53142d5f3f5958d678380b8fa54eed363f239b660f0892dd897670
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fd8a48e27550c1e5067edb5afc5d1d225b0ded71094262884d6b77008bb94d19
[INFO] running `Command { std: "docker" "start" "-a" "fd8a48e27550c1e5067edb5afc5d1d225b0ded71094262884d6b77008bb94d19", kill_on_drop: false }`
[INFO] [stderr]    Compiling chap-3 v0.1.0 (/opt/rustwide/workdir/chap-3)
[INFO] [stderr]    Compiling chap-4 v0.1.0 (/opt/rustwide/workdir/chap-4)
[INFO] [stderr]    Compiling chap-1 v0.1.0 (/opt/rustwide/workdir/chap-1)
[INFO] [stderr]    Compiling chap-2 v0.1.0 (/opt/rustwide/workdir/chap-2)
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> chap-2/src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::error::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s3`
[INFO] [stdout]   --> chap-4/src/main.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let s3 = &mut s1;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s3`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s4`
[INFO] [stdout]   --> chap-4/src/main.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let s4 = &mut s1;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s4`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.41s
[INFO] [stderr]   Executable unittests src/main.rs (/opt/rustwide/target/debug/deps/chap_1-9b4fa9143f2df654)
[INFO] [stderr]   Executable unittests src/main.rs (/opt/rustwide/target/debug/deps/chap_2-c318ae32290d65a6)
[INFO] [stderr]   Executable unittests src/main.rs (/opt/rustwide/target/debug/deps/chap_3-53abe375a5f43580)
[INFO] [stderr]   Executable unittests src/main.rs (/opt/rustwide/target/debug/deps/chap_4-7c3b267c52981165)
[INFO] running `Command { std: "docker" "inspect" "fd8a48e27550c1e5067edb5afc5d1d225b0ded71094262884d6b77008bb94d19", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd8a48e27550c1e5067edb5afc5d1d225b0ded71094262884d6b77008bb94d19", kill_on_drop: false }`
[INFO] [stdout] fd8a48e27550c1e5067edb5afc5d1d225b0ded71094262884d6b77008bb94d19
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 87eef0eacabfcbb6e3930689c092542a278c1ceaea7ff715008f321c04a59f8b
[INFO] running `Command { std: "docker" "start" "-a" "87eef0eacabfcbb6e3930689c092542a278c1ceaea7ff715008f321c04a59f8b", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: unused variable: `s3`
[INFO] [stderr]   --> chap-4/src/main.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let s3 = &mut s1;
[INFO] [stderr]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s3`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s4`
[INFO] [stderr]   --> chap-4/src/main.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |     let s4 = &mut s1;
[INFO] [stderr]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s4`
[INFO] [stderr] 
[INFO] [stderr] warning: `chap-4` (bin "chap-4" test) generated 2 warnings
[INFO] [stderr] warning: unused import: `std::error::Error`
[INFO] [stderr]  --> chap-2/src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::error::Error;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `chap-2` (bin "chap-2" test) generated 1 warning
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/chap_1-9b4fa9143f2df654)
[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] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/chap_2-c318ae32290d65a6)
[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] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/chap_3-53abe375a5f43580)
[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] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/chap_4-7c3b267c52981165)
[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" "87eef0eacabfcbb6e3930689c092542a278c1ceaea7ff715008f321c04a59f8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87eef0eacabfcbb6e3930689c092542a278c1ceaea7ff715008f321c04a59f8b", kill_on_drop: false }`
[INFO] [stdout] 87eef0eacabfcbb6e3930689c092542a278c1ceaea7ff715008f321c04a59f8b