[INFO] cloning repository https://github.com/ralvescosta/rust_for_rustaceans_book
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ralvescosta/rust_for_rustaceans_book" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fralvescosta%2Frust_for_rustaceans_book", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fralvescosta%2Frust_for_rustaceans_book'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dfb7d9140aea0b77a184d3b924d155e24aaa2cad
[INFO] testing ralvescosta/rust_for_rustaceans_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%2Fralvescosta%2Frust_for_rustaceans_book" "/workspace/builds/worker-65/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-65/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ralvescosta/rust_for_rustaceans_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/ralvescosta/rust_for_rustaceans_book
[INFO] finished tweaking git repo https://github.com/ralvescosta/rust_for_rustaceans_book
[INFO] tweaked toml for git repo https://github.com/ralvescosta/rust_for_rustaceans_book written to /workspace/builds/worker-65/source/Cargo.toml
[INFO] crate git repo https://github.com/ralvescosta/rust_for_rustaceans_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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-65/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-65/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] 97fac56e0cd4341113c89bd6c265e24835ac35d49663468ef7cbc1ba16f20413
[INFO] running `Command { std: "docker" "start" "-a" "97fac56e0cd4341113c89bd6c265e24835ac35d49663468ef7cbc1ba16f20413", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "97fac56e0cd4341113c89bd6c265e24835ac35d49663468ef7cbc1ba16f20413", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "97fac56e0cd4341113c89bd6c265e24835ac35d49663468ef7cbc1ba16f20413", kill_on_drop: false }`
[INFO] [stdout] 97fac56e0cd4341113c89bd6c265e24835ac35d49663468ef7cbc1ba16f20413
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-65/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-65/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] f839f58c3a80202f5308cc09f83209209374bcaa67125b4aee03412649a4854f
[INFO] running `Command { std: "docker" "start" "-a" "f839f58c3a80202f5308cc09f83209209374bcaa67125b4aee03412649a4854f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.112
[INFO] [stderr]    Compiling ppv-lite86 v0.2.16
[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 rust_for_rustaceans_book v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/chapter_one/mod.rs:24:13
[INFO] [stdout]    |
[INFO] [stdout] 24 |         let z = (x1, y1); // x1 is copied and y1 is moved
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x2`
[INFO] [stdout]   --> src/chapter_one/mod.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let x2 = x1; // x1's value is copy where, so it was not moved into z in line 24
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_x2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/chapter_one/mod.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let mut x;
[INFO] [stdout]   |         ----^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.80s
[INFO] running `Command { std: "docker" "inspect" "f839f58c3a80202f5308cc09f83209209374bcaa67125b4aee03412649a4854f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f839f58c3a80202f5308cc09f83209209374bcaa67125b4aee03412649a4854f", kill_on_drop: false }`
[INFO] [stdout] f839f58c3a80202f5308cc09f83209209374bcaa67125b4aee03412649a4854f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-65/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-65/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] fce40c3fe97b3203226ec474f3a0395c48d6a21cef960a6d6c68639570dfa656
[INFO] running `Command { std: "docker" "start" "-a" "fce40c3fe97b3203226ec474f3a0395c48d6a21cef960a6d6c68639570dfa656", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_for_rustaceans_book v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/chapter_one/mod.rs:24:13
[INFO] [stdout]    |
[INFO] [stdout] 24 |         let z = (x1, y1); // x1 is copied and y1 is moved
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x2`
[INFO] [stdout]   --> src/chapter_one/mod.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let x2 = x1; // x1's value is copy where, so it was not moved into z in line 24
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_x2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/chapter_one/mod.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let mut x;
[INFO] [stdout]   |         ----^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.30s
[INFO] running `Command { std: "docker" "inspect" "fce40c3fe97b3203226ec474f3a0395c48d6a21cef960a6d6c68639570dfa656", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fce40c3fe97b3203226ec474f3a0395c48d6a21cef960a6d6c68639570dfa656", kill_on_drop: false }`
[INFO] [stdout] fce40c3fe97b3203226ec474f3a0395c48d6a21cef960a6d6c68639570dfa656
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-65/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-65/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] 7fed8fbe956804972cdce924112606c6625249a4fe5d87e28cadbb2387bdba7f
[INFO] running `Command { std: "docker" "start" "-a" "7fed8fbe956804972cdce924112606c6625249a4fe5d87e28cadbb2387bdba7f", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `z`
[INFO] [stderr]   --> src/chapter_one/mod.rs:24:13
[INFO] [stderr]    |
[INFO] [stderr] 24 |         let z = (x1, y1); // x1 is copied and y1 is moved
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x2`
[INFO] [stderr]   --> src/chapter_one/mod.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let x2 = x1; // x1's value is copy where, so it was not moved into z in line 24
[INFO] [stderr]    |         ^^ help: if this is intentional, prefix it with an underscore: `_x2`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/chapter_one/mod.rs:3:9
[INFO] [stderr]   |
[INFO] [stderr] 3 |     let mut x;
[INFO] [stderr]   |         ----^
[INFO] [stderr]   |         |
[INFO] [stderr]   |         help: remove this `mut`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_for_rustaceans_book` (bin "rust_for_rustaceans_book" test) generated 3 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rust_for_rustaceans_book-7585c3df12fa5db8)
[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" "7fed8fbe956804972cdce924112606c6625249a4fe5d87e28cadbb2387bdba7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7fed8fbe956804972cdce924112606c6625249a4fe5d87e28cadbb2387bdba7f", kill_on_drop: false }`
[INFO] [stdout] 7fed8fbe956804972cdce924112606c6625249a4fe5d87e28cadbb2387bdba7f