[INFO] updating cached repository AnthonyP4312/i3-alt-tab
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/AnthonyP4312/i3-alt-tab
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/AnthonyP4312/i3-alt-tab" "work/ex/pr-61100/sources/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504/gh/AnthonyP4312/i3-alt-tab"`
[INFO] [stderr] Cloning into 'work/ex/pr-61100/sources/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504/gh/AnthonyP4312/i3-alt-tab'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/AnthonyP4312/i3-alt-tab" "work/ex/pr-61100/sources/try#58b21121d0b447ceb3f1a655155d802191acf044/gh/AnthonyP4312/i3-alt-tab"`
[INFO] [stderr] Cloning into 'work/ex/pr-61100/sources/try#58b21121d0b447ceb3f1a655155d802191acf044/gh/AnthonyP4312/i3-alt-tab'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 64efd56944d26cce816fc0e4b7cefb9b5e201b0e
[INFO] sha for GitHub repo AnthonyP4312/i3-alt-tab: 64efd56944d26cce816fc0e4b7cefb9b5e201b0e
[INFO] validating manifest of AnthonyP4312/i3-alt-tab on toolchain master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+8869ee03d7f258e1b76a11c6fbb01b5708a9f504-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of AnthonyP4312/i3-alt-tab on toolchain try#58b21121d0b447ceb3f1a655155d802191acf044
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+58b21121d0b447ceb3f1a655155d802191acf044-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing AnthonyP4312/i3-alt-tab
[INFO] finished frobbing AnthonyP4312/i3-alt-tab
[INFO] frobbed toml for AnthonyP4312/i3-alt-tab written to work/ex/pr-61100/sources/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504/gh/AnthonyP4312/i3-alt-tab/Cargo.toml
[INFO] started frobbing AnthonyP4312/i3-alt-tab
[INFO] finished frobbing AnthonyP4312/i3-alt-tab
[INFO] frobbed toml for AnthonyP4312/i3-alt-tab written to work/ex/pr-61100/sources/try#58b21121d0b447ceb3f1a655155d802191acf044/gh/AnthonyP4312/i3-alt-tab/Cargo.toml
[INFO] crate AnthonyP4312/i3-alt-tab already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+8869ee03d7f258e1b76a11c6fbb01b5708a9f504-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+58b21121d0b447ceb3f1a655155d802191acf044-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking AnthonyP4312/i3-alt-tab against try#58b21121d0b447ceb3f1a655155d802191acf044 for pr-61100
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-61100/worker-7/try#58b21121d0b447ceb3f1a655155d802191acf044:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-61100/sources/try#58b21121d0b447ceb3f1a655155d802191acf044/gh/AnthonyP4312/i3-alt-tab:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+58b21121d0b447ceb3f1a655155d802191acf044-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] f8bea41cda81a1c0edff9c0a0aa720abe7276aa6772856c4a29aec16c6db7285
[INFO] running `"docker" "start" "-a" "f8bea41cda81a1c0edff9c0a0aa720abe7276aa6772856c4a29aec16c6db7285"`
[INFO] [stderr]     Checking alt_tabber v0.1.0 (/opt/crater/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] 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 2.60s
[INFO] running `"docker" "inspect" "f8bea41cda81a1c0edff9c0a0aa720abe7276aa6772856c4a29aec16c6db7285"`
[INFO] running `"docker" "rm" "-f" "f8bea41cda81a1c0edff9c0a0aa720abe7276aa6772856c4a29aec16c6db7285"`
[INFO] [stdout] f8bea41cda81a1c0edff9c0a0aa720abe7276aa6772856c4a29aec16c6db7285