[INFO] cloning repository https://github.com/Alvynskio/rust_book_projects
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Alvynskio/rust_book_projects" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAlvynskio%2Frust_book_projects", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAlvynskio%2Frust_book_projects'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0271a7f2692e09d0e86549849fc1cdc0cd314cb2
[INFO] testing Alvynskio/rust_book_projects against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAlvynskio%2Frust_book_projects" "/workspace/builds/worker-118/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-118/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Alvynskio/rust_book_projects on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Alvynskio/rust_book_projects
[INFO] finished tweaking git repo https://github.com/Alvynskio/rust_book_projects
[INFO] tweaked toml for git repo https://github.com/Alvynskio/rust_book_projects written to /workspace/builds/worker-118/source/Cargo.toml
[INFO] crate git repo https://github.com/Alvynskio/rust_book_projects already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "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-118/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-118/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1a8f030ea8e7ca665abeec5d35cf3f907249a1706f0c1b5035670bc895fe6b89
[INFO] running `Command { std: "docker" "start" "-a" "1a8f030ea8e7ca665abeec5d35cf3f907249a1706f0c1b5035670bc895fe6b89", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1a8f030ea8e7ca665abeec5d35cf3f907249a1706f0c1b5035670bc895fe6b89", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1a8f030ea8e7ca665abeec5d35cf3f907249a1706f0c1b5035670bc895fe6b89", kill_on_drop: false }`
[INFO] [stdout] 1a8f030ea8e7ca665abeec5d35cf3f907249a1706f0c1b5035670bc895fe6b89
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-118/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-118/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7e58766c5cb0f0a35e666988f16d804403cd4c5805e980b9f89d6db8196392c9
[INFO] running `Command { std: "docker" "start" "-a" "7e58766c5cb0f0a35e666988f16d804403cd4c5805e980b9f89d6db8196392c9", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.103
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[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 book_projects v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/slice.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let mut s = String::from("hello world");
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 15s
[INFO] running `Command { std: "docker" "inspect" "7e58766c5cb0f0a35e666988f16d804403cd4c5805e980b9f89d6db8196392c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7e58766c5cb0f0a35e666988f16d804403cd4c5805e980b9f89d6db8196392c9", kill_on_drop: false }`
[INFO] [stdout] 7e58766c5cb0f0a35e666988f16d804403cd4c5805e980b9f89d6db8196392c9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-118/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-118/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7d4b5d44dfcff027c904c61e3a9ad3a239ca5059fb6473b6fa7c1570c0d29007
[INFO] running `Command { std: "docker" "start" "-a" "7d4b5d44dfcff027c904c61e3a9ad3a239ca5059fb6473b6fa7c1570c0d29007", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling book_projects v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/slice.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let mut s = String::from("hello world");
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 3.80s
[INFO] running `Command { std: "docker" "inspect" "7d4b5d44dfcff027c904c61e3a9ad3a239ca5059fb6473b6fa7c1570c0d29007", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7d4b5d44dfcff027c904c61e3a9ad3a239ca5059fb6473b6fa7c1570c0d29007", kill_on_drop: false }`
[INFO] [stdout] 7d4b5d44dfcff027c904c61e3a9ad3a239ca5059fb6473b6fa7c1570c0d29007
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-118/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-118/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] f61ad320b2957a098ff66fb32e06ad96fbbce89019d906cb311918a6ff58fcec
[INFO] running `Command { std: "docker" "start" "-a" "f61ad320b2957a098ff66fb32e06ad96fbbce89019d906cb311918a6ff58fcec", kill_on_drop: false }`
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/slice.rs:2:9
[INFO] [stderr]   |
[INFO] [stderr] 2 |     let mut s = String::from("hello world");
[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: `book_projects` (bin "book_projects" test) generated 1 warning
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/book_projects-3d997db65ea09879)
[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" "f61ad320b2957a098ff66fb32e06ad96fbbce89019d906cb311918a6ff58fcec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f61ad320b2957a098ff66fb32e06ad96fbbce89019d906cb311918a6ff58fcec", kill_on_drop: false }`
[INFO] [stdout] f61ad320b2957a098ff66fb32e06ad96fbbce89019d906cb311918a6ff58fcec