[INFO] cloning repository https://github.com/jakecrim/rust_notes
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jakecrim/rust_notes" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjakecrim%2Frust_notes", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjakecrim%2Frust_notes'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7d3c24a57abf24a52034ec1039815bfb6eb9bfd0
[INFO] testing jakecrim/rust_notes against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjakecrim%2Frust_notes" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jakecrim/rust_notes on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jakecrim/rust_notes
[INFO] finished tweaking git repo https://github.com/jakecrim/rust_notes
[INFO] tweaked toml for git repo https://github.com/jakecrim/rust_notes written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/jakecrim/rust_notes already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3d34e4e4fbecb78a8b263c7689ff437127ff46f613b8acc64bd0eef6fe320dac
[INFO] running `Command { std: "docker" "start" "-a" "3d34e4e4fbecb78a8b263c7689ff437127ff46f613b8acc64bd0eef6fe320dac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3d34e4e4fbecb78a8b263c7689ff437127ff46f613b8acc64bd0eef6fe320dac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3d34e4e4fbecb78a8b263c7689ff437127ff46f613b8acc64bd0eef6fe320dac", kill_on_drop: false }`
[INFO] [stdout] 3d34e4e4fbecb78a8b263c7689ff437127ff46f613b8acc64bd0eef6fe320dac
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5ab9e71462df5d76882bd5eee7d36e33e445d6223fde6ff470d2d0220b2d68ac
[INFO] running `Command { std: "docker" "start" "-a" "5ab9e71462df5d76882bd5eee7d36e33e445d6223fde6ff470d2d0220b2d68ac", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.7
[INFO] [stderr]    Compiling syn v1.0.12
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling num-traits v0.2.10
[INFO] [stderr]    Compiling libloading v0.5.2
[INFO] [stderr]    Compiling stb_truetype v0.3.1
[INFO] [stderr]    Compiling nix v0.14.1
[INFO] [stderr]    Compiling x11-dl v2.18.4
[INFO] [stderr]    Compiling memmap v0.7.0
[INFO] [stderr]    Compiling shared_library v0.1.9
[INFO] [stderr]    Compiling raw-window-handle v0.3.3
[INFO] [stderr]    Compiling crossbeam-queue v0.2.1
[INFO] [stderr]    Compiling png v0.15.2
[INFO] [stderr]    Compiling rayon-core v1.7.0
[INFO] [stderr]    Compiling osmesa-sys v0.1.2
[INFO] [stderr]    Compiling rayon v1.3.0
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]    Compiling dlib v0.4.1
[INFO] [stderr]    Compiling wayland-sys v0.21.13
[INFO] [stderr]    Compiling ordered-float v1.0.2
[INFO] [stderr]    Compiling approx v0.3.2
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling line_drawing v0.7.0
[INFO] [stderr]    Compiling rusttype v0.8.2
[INFO] [stderr]    Compiling glutin_glx_sys v0.1.5
[INFO] [stderr]    Compiling num-iter v0.1.39
[INFO] [stderr]    Compiling num-rational v0.2.2
[INFO] [stderr]    Compiling rusttype v0.7.9
[INFO] [stderr]    Compiling andrew v0.2.1
[INFO] [stderr]    Compiling piston2d-graphics v0.35.0
[INFO] [stderr]    Compiling jpeg-decoder v0.1.18
[INFO] [stderr]    Compiling num-derive v0.2.5
[INFO] [stderr]    Compiling wayland-commons v0.21.13
[INFO] [stderr]    Compiling wayland-client v0.21.13
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling wayland-protocols v0.21.13
[INFO] [stderr]    Compiling tiff v0.3.1
[INFO] [stderr]    Compiling image v0.22.3
[INFO] [stderr]    Compiling smithay-client-toolkit v0.4.6
[INFO] [stderr]    Compiling winit v0.19.5
[INFO] [stderr]    Compiling piston-gfx_texture v0.40.0
[INFO] [stderr]    Compiling piston2d-gfx_graphics v0.66.0
[INFO] [stderr]    Compiling pistoncore-input v0.28.0
[INFO] [stderr]    Compiling glutin v0.21.2
[INFO] [stderr]    Compiling pistoncore-window v0.44.0
[INFO] [stderr]    Compiling pistoncore-event_loop v0.49.0
[INFO] [stderr]    Compiling pistoncore-glutin_window v0.63.0
[INFO] [stderr]    Compiling piston v0.49.0
[INFO] [stderr]    Compiling piston_window v0.105.0
[INFO] [stderr]    Compiling rust_notes v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/main.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut x = String::from("Hey there");
[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: variable does not need to be mutable
[INFO] [stdout]  --> src/main.rs:5:6
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let mut y = String::from("Hello dawg woof");
[INFO] [stdout]   |         ----^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 31.93s
[INFO] running `Command { std: "docker" "inspect" "5ab9e71462df5d76882bd5eee7d36e33e445d6223fde6ff470d2d0220b2d68ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5ab9e71462df5d76882bd5eee7d36e33e445d6223fde6ff470d2d0220b2d68ac", kill_on_drop: false }`
[INFO] [stdout] 5ab9e71462df5d76882bd5eee7d36e33e445d6223fde6ff470d2d0220b2d68ac
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 22975990688c1f39e39464bdc6bd5c5184f6851b13a9639f17510684fbb3af3f
[INFO] running `Command { std: "docker" "start" "-a" "22975990688c1f39e39464bdc6bd5c5184f6851b13a9639f17510684fbb3af3f", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_notes v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/main.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut x = String::from("Hey there");
[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: variable does not need to be mutable
[INFO] [stdout]  --> src/main.rs:5:6
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let mut y = String::from("Hello dawg woof");
[INFO] [stdout]   |         ----^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.69s
[INFO] running `Command { std: "docker" "inspect" "22975990688c1f39e39464bdc6bd5c5184f6851b13a9639f17510684fbb3af3f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "22975990688c1f39e39464bdc6bd5c5184f6851b13a9639f17510684fbb3af3f", kill_on_drop: false }`
[INFO] [stdout] 22975990688c1f39e39464bdc6bd5c5184f6851b13a9639f17510684fbb3af3f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] f1e46f1d5eda1e714602608bf7fb920897c0a6b4fb0eb6bd19a0b03afd94fd70
[INFO] running `Command { std: "docker" "start" "-a" "f1e46f1d5eda1e714602608bf7fb920897c0a6b4fb0eb6bd19a0b03afd94fd70", kill_on_drop: false }`
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/main.rs:4:6
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let mut x = String::from("Hey there");
[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: variable does not need to be mutable
[INFO] [stderr]  --> src/main.rs:5:6
[INFO] [stderr]   |
[INFO] [stderr] 5 |     let mut y = String::from("Hello dawg woof");
[INFO] [stderr]   |         ----^
[INFO] [stderr]   |         |
[INFO] [stderr]   |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_notes` (bin "rust_notes" test) generated 2 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.13s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rust_notes-e339f59a18aee33c)
[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" "f1e46f1d5eda1e714602608bf7fb920897c0a6b4fb0eb6bd19a0b03afd94fd70", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f1e46f1d5eda1e714602608bf7fb920897c0a6b4fb0eb6bd19a0b03afd94fd70", kill_on_drop: false }`
[INFO] [stdout] f1e46f1d5eda1e714602608bf7fb920897c0a6b4fb0eb6bd19a0b03afd94fd70