[INFO] cloning repository https://github.com/modulitos/programming-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/modulitos/programming-rust-book" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmodulitos%2Fprogramming-rust-book", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmodulitos%2Fprogramming-rust-book'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1df18938c89c4f63579528fb8fddba6a20ae2082
[INFO] testing modulitos/programming-rust-book against 1.59.0 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmodulitos%2Fprogramming-rust-book" "/workspace/builds/worker-16/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-16/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/modulitos/programming-rust-book on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/modulitos/programming-rust-book
[INFO] finished tweaking git repo https://github.com/modulitos/programming-rust-book
[INFO] tweaked toml for git repo https://github.com/modulitos/programming-rust-book written to /workspace/builds/worker-16/source/Cargo.toml
[INFO] crate git repo https://github.com/modulitos/programming-rust-book already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 30280c6938c40eb8c4844beb31f800dae81a553d53386bd77ed4881dac8c54c6
[INFO] running `Command { std: "docker" "start" "-a" "30280c6938c40eb8c4844beb31f800dae81a553d53386bd77ed4881dac8c54c6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "30280c6938c40eb8c4844beb31f800dae81a553d53386bd77ed4881dac8c54c6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "30280c6938c40eb8c4844beb31f800dae81a553d53386bd77ed4881dac8c54c6", kill_on_drop: false }`
[INFO] [stdout] 30280c6938c40eb8c4844beb31f800dae81a553d53386bd77ed4881dac8c54c6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 214c06ea1aef22afdafcbb55b37420cb0bca0cb48d6354400fa52fa09f0a7171
[INFO] running `Command { std: "docker" "start" "-a" "214c06ea1aef22afdafcbb55b37420cb0bca0cb48d6354400fa52fa09f0a7171", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling programming_rust_book v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `words`
[INFO] [stdout]   --> src/ch_11.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 53 |     let words: Vec<String> = line
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_words`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `other`
[INFO] [stdout]   --> src/ch_11.rs:11:22
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fn splice(&self, other: &Self) -> Self {
[INFO] [stdout]    |                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `other`
[INFO] [stdout]   --> src/ch_11.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn splice(&self, other: &Self) -> Self {
[INFO] [stdout]    |                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `other`
[INFO] [stdout]   --> src/ch_11.rs:37:22
[INFO] [stdout]    |
[INFO] [stdout] 37 |     fn splice(&self, other: &dyn MegaSpliceable) -> Box<dyn MegaSpliceable> {
[INFO] [stdout]    |                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `other`
[INFO] [stdout]   --> src/ch_11.rs:44:22
[INFO] [stdout]    |
[INFO] [stdout] 44 |     fn splice(&self, other: &dyn MegaSpliceable) -> Box<dyn MegaSpliceable> {
[INFO] [stdout]    |                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_fqmc`
[INFO] [stdout]   --> src/ch_11.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn test_fqmc() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `dump`
[INFO] [stdout]   --> src/ch_11.rs:74:4
[INFO] [stdout]    |
[INFO] [stdout] 74 | fn dump<I>(iter: I)
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.88s
[INFO] running `Command { std: "docker" "inspect" "214c06ea1aef22afdafcbb55b37420cb0bca0cb48d6354400fa52fa09f0a7171", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "214c06ea1aef22afdafcbb55b37420cb0bca0cb48d6354400fa52fa09f0a7171", kill_on_drop: false }`
[INFO] [stdout] 214c06ea1aef22afdafcbb55b37420cb0bca0cb48d6354400fa52fa09f0a7171
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c851d9aaaaf77a4e42848309ceaf4ae40b00b67b8ff223437e78e5581513176d
[INFO] running `Command { std: "docker" "start" "-a" "c851d9aaaaf77a4e42848309ceaf4ae40b00b67b8ff223437e78e5581513176d", kill_on_drop: false }`
[INFO] [stderr]    Compiling programming_rust_book v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `words`
[INFO] [stdout]   --> src/ch_11.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 53 |     let words: Vec<String> = line
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_words`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `other`
[INFO] [stdout]   --> src/ch_11.rs:11:22
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fn splice(&self, other: &Self) -> Self {
[INFO] [stdout]    |                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `other`
[INFO] [stdout]   --> src/ch_11.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn splice(&self, other: &Self) -> Self {
[INFO] [stdout]    |                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `other`
[INFO] [stdout]   --> src/ch_11.rs:37:22
[INFO] [stdout]    |
[INFO] [stdout] 37 |     fn splice(&self, other: &dyn MegaSpliceable) -> Box<dyn MegaSpliceable> {
[INFO] [stdout]    |                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `other`
[INFO] [stdout]   --> src/ch_11.rs:44:22
[INFO] [stdout]    |
[INFO] [stdout] 44 |     fn splice(&self, other: &dyn MegaSpliceable) -> Box<dyn MegaSpliceable> {
[INFO] [stdout]    |                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_fqmc`
[INFO] [stdout]   --> src/ch_11.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn test_fqmc() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `dump`
[INFO] [stdout]   --> src/ch_11.rs:74:4
[INFO] [stdout]    |
[INFO] [stdout] 74 | fn dump<I>(iter: I)
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.30s
[INFO] running `Command { std: "docker" "inspect" "c851d9aaaaf77a4e42848309ceaf4ae40b00b67b8ff223437e78e5581513176d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c851d9aaaaf77a4e42848309ceaf4ae40b00b67b8ff223437e78e5581513176d", kill_on_drop: false }`
[INFO] [stdout] c851d9aaaaf77a4e42848309ceaf4ae40b00b67b8ff223437e78e5581513176d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 337bcda21b7d593a556ba0e35725024ceecb088190e166a2aae36e078f89a24b
[INFO] running `Command { std: "docker" "start" "-a" "337bcda21b7d593a556ba0e35725024ceecb088190e166a2aae36e078f89a24b", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `words`
[INFO] [stderr]   --> src/ch_11.rs:53:9
[INFO] [stderr]    |
[INFO] [stderr] 53 |     let words: Vec<String> = line
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_words`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]   --> src/ch_11.rs:11:22
[INFO] [stderr]    |
[INFO] [stderr] 11 |     fn splice(&self, other: &Self) -> Self {
[INFO] [stderr]    |                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]   --> src/ch_11.rs:20:22
[INFO] [stderr]    |
[INFO] [stderr] 20 |     fn splice(&self, other: &Self) -> Self {
[INFO] [stderr]    |                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]   --> src/ch_11.rs:37:22
[INFO] [stderr]    |
[INFO] [stderr] 37 |     fn splice(&self, other: &dyn MegaSpliceable) -> Box<dyn MegaSpliceable> {
[INFO] [stderr]    |                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]   --> src/ch_11.rs:44:22
[INFO] [stderr]    |
[INFO] [stderr] 44 |     fn splice(&self, other: &dyn MegaSpliceable) -> Box<dyn MegaSpliceable> {
[INFO] [stderr]    |                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test_fqmc`
[INFO] [stderr]   --> src/ch_11.rs:51:4
[INFO] [stderr]    |
[INFO] [stderr] 51 | fn test_fqmc() {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `dump`
[INFO] [stderr]   --> src/ch_11.rs:74:4
[INFO] [stderr]    |
[INFO] [stderr] 74 | fn dump<I>(iter: I)
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `programming_rust_book` (bin "programming_rust_book" test) generated 7 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.00s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/programming_rust_book-acf9493d904bf089)
[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" "337bcda21b7d593a556ba0e35725024ceecb088190e166a2aae36e078f89a24b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "337bcda21b7d593a556ba0e35725024ceecb088190e166a2aae36e078f89a24b", kill_on_drop: false }`
[INFO] [stdout] 337bcda21b7d593a556ba0e35725024ceecb088190e166a2aae36e078f89a24b