[INFO] cloning repository https://github.com/BurningBlueFox/rust-treehouse-club
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/BurningBlueFox/rust-treehouse-club" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBurningBlueFox%2Frust-treehouse-club", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBurningBlueFox%2Frust-treehouse-club'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4d8d619ef4dc478e0f2bbb0f105c886f2704d421
[INFO] testing BurningBlueFox/rust-treehouse-club against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBurningBlueFox%2Frust-treehouse-club" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/BurningBlueFox/rust-treehouse-club on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/BurningBlueFox/rust-treehouse-club
[INFO] finished tweaking git repo https://github.com/BurningBlueFox/rust-treehouse-club
[INFO] tweaked toml for git repo https://github.com/BurningBlueFox/rust-treehouse-club written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/BurningBlueFox/rust-treehouse-club already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "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-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e27d6abd05f7602b6634d00fcfb4eeb8539d3415af2a7118695b11132cabf7a7
[INFO] running `Command { std: "docker" "start" "-a" "e27d6abd05f7602b6634d00fcfb4eeb8539d3415af2a7118695b11132cabf7a7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e27d6abd05f7602b6634d00fcfb4eeb8539d3415af2a7118695b11132cabf7a7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e27d6abd05f7602b6634d00fcfb4eeb8539d3415af2a7118695b11132cabf7a7", kill_on_drop: false }`
[INFO] [stdout] e27d6abd05f7602b6634d00fcfb4eeb8539d3415af2a7118695b11132cabf7a7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3c6fdae16d675885da3b21dd200d99039966301d282d368afabc42bfc56a27da
[INFO] running `Command { std: "docker" "start" "-a" "3c6fdae16d675885da3b21dd200d99039966301d282d368afabc42bfc56a27da", kill_on_drop: false }`
[INFO] [stderr]    Compiling treehouse v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/visitor.rs:29:17
[INFO] [stdout]    |
[INFO] [stdout] 29 |                 &self.do_something_more_involved();
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 29 |                 let _ = &self.do_something_more_involved();
[INFO] [stdout]    |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.73s
[INFO] running `Command { std: "docker" "inspect" "3c6fdae16d675885da3b21dd200d99039966301d282d368afabc42bfc56a27da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c6fdae16d675885da3b21dd200d99039966301d282d368afabc42bfc56a27da", kill_on_drop: false }`
[INFO] [stdout] 3c6fdae16d675885da3b21dd200d99039966301d282d368afabc42bfc56a27da
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 01fab102df0b57a6f75ae2b10ee041f339e8687edcb1fa01ebd87e4c9f2a8cef
[INFO] running `Command { std: "docker" "start" "-a" "01fab102df0b57a6f75ae2b10ee041f339e8687edcb1fa01ebd87e4c9f2a8cef", kill_on_drop: false }`
[INFO] [stderr]    Compiling treehouse v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/visitor.rs:29:17
[INFO] [stdout]    |
[INFO] [stdout] 29 |                 &self.do_something_more_involved();
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 29 |                 let _ = &self.do_something_more_involved();
[INFO] [stdout]    |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.33s
[INFO] running `Command { std: "docker" "inspect" "01fab102df0b57a6f75ae2b10ee041f339e8687edcb1fa01ebd87e4c9f2a8cef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "01fab102df0b57a6f75ae2b10ee041f339e8687edcb1fa01ebd87e4c9f2a8cef", kill_on_drop: false }`
[INFO] [stdout] 01fab102df0b57a6f75ae2b10ee041f339e8687edcb1fa01ebd87e4c9f2a8cef
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+1.60.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 14f99e3013a959dbbde462bcd438728225dca614a5b8b65cfa1a7c8759a74c53
[INFO] running `Command { std: "docker" "start" "-a" "14f99e3013a959dbbde462bcd438728225dca614a5b8b65cfa1a7c8759a74c53", kill_on_drop: false }`
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]   --> src/visitor.rs:29:17
[INFO] [stderr]    |
[INFO] [stderr] 29 |                 &self.do_something_more_involved();
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 29 |                 let _ = &self.do_something_more_involved();
[INFO] [stderr]    |                 +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `treehouse` (bin "treehouse" test) generated 1 warning
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/treehouse-c30320767ca96abc)
[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" "14f99e3013a959dbbde462bcd438728225dca614a5b8b65cfa1a7c8759a74c53", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "14f99e3013a959dbbde462bcd438728225dca614a5b8b65cfa1a7c8759a74c53", kill_on_drop: false }`
[INFO] [stdout] 14f99e3013a959dbbde462bcd438728225dca614a5b8b65cfa1a7c8759a74c53