[INFO] updating cached repository https://github.com/AnthonyP4312/i3-alt-tab
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 64efd56944d26cce816fc0e4b7cefb9b5e201b0e
[INFO] testing AnthonyP4312/i3-alt-tab against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2FAnthonyP4312%2Fi3-alt-tab" "work/builds/worker-7/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/AnthonyP4312/i3-alt-tab on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/AnthonyP4312/i3-alt-tab
[INFO] finished tweaking git repo https://github.com/AnthonyP4312/i3-alt-tab
[INFO] tweaked toml for git repo https://github.com/AnthonyP4312/i3-alt-tab written to work/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/AnthonyP4312/i3-alt-tab already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] 01390fb860ff85d8a56f833ed06f0e7112ca3cec5ebc1541776813f54552f5e1
[INFO] running `"docker" "start" "-a" "01390fb860ff85d8a56f833ed06f0e7112ca3cec5ebc1541776813f54552f5e1"`
[INFO] [stderr]    Compiling serde_json v1.0.21
[INFO] [stderr]    Compiling alt_tabber v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:39:5
[INFO] [stderr]    |
[INFO] [stderr] 39 | /     Command::new("i3-msg")
[INFO] [stderr] 40 | |         .arg(format!("[con_id={}] focus", next.id))
[INFO] [stderr] 41 | |         .output();
[INFO] [stderr]    | |__________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.03s
[INFO] running `"docker" "inspect" "01390fb860ff85d8a56f833ed06f0e7112ca3cec5ebc1541776813f54552f5e1"`
[INFO] running `"docker" "rm" "-f" "01390fb860ff85d8a56f833ed06f0e7112ca3cec5ebc1541776813f54552f5e1"`
[INFO] [stdout] 01390fb860ff85d8a56f833ed06f0e7112ca3cec5ebc1541776813f54552f5e1
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "test" "--frozen" "--no-run"`
[INFO] [stdout] d7634953b8cc6f59bab7303ca906ed988c1276cbb6998308c0e6434a381d9ce8
[INFO] running `"docker" "start" "-a" "d7634953b8cc6f59bab7303ca906ed988c1276cbb6998308c0e6434a381d9ce8"`
[INFO] [stderr]    Compiling alt_tabber v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `child_c`
[INFO] [stderr]   --> src/main.rs:85:13
[INFO] [stderr]    |
[INFO] [stderr] 85 |         let child_c = Node {
[INFO] [stderr]    |             ^^^^^^^ help: consider prefixing with an underscore: `_child_c`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `node_with_children`
[INFO] [stderr]   --> src/main.rs:89:13
[INFO] [stderr]    |
[INFO] [stderr] 89 |         let node_with_children = Node {
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_node_with_children`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `setup`
[INFO] [stderr]   --> src/main.rs:67:5
[INFO] [stderr]    |
[INFO] [stderr] 67 |     fn setup() {
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:39:5
[INFO] [stderr]    |
[INFO] [stderr] 39 | /     Command::new("i3-msg")
[INFO] [stderr] 40 | |         .arg(format!("[con_id={}] focus", next.id))
[INFO] [stderr] 41 | |         .output();
[INFO] [stderr]    | |__________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.76s
[INFO] running `"docker" "inspect" "d7634953b8cc6f59bab7303ca906ed988c1276cbb6998308c0e6434a381d9ce8"`
[INFO] running `"docker" "rm" "-f" "d7634953b8cc6f59bab7303ca906ed988c1276cbb6998308c0e6434a381d9ce8"`
[INFO] [stdout] d7634953b8cc6f59bab7303ca906ed988c1276cbb6998308c0e6434a381d9ce8
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "test" "--frozen"`
[INFO] [stdout] c5a2ce188313809fb002791a1bd226e95cdbedaa8ce38eaee5416ad84e466dd0
[INFO] running `"docker" "start" "-a" "c5a2ce188313809fb002791a1bd226e95cdbedaa8ce38eaee5416ad84e466dd0"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/alt_tabber-d6c5ee6e2c40c917
[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
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/alt_tabber-206abfd0383b28c5
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test test_flatten::flattens ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests alt_tabber
[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
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "c5a2ce188313809fb002791a1bd226e95cdbedaa8ce38eaee5416ad84e466dd0"`
[INFO] running `"docker" "rm" "-f" "c5a2ce188313809fb002791a1bd226e95cdbedaa8ce38eaee5416ad84e466dd0"`
[INFO] [stdout] c5a2ce188313809fb002791a1bd226e95cdbedaa8ce38eaee5416ad84e466dd0