[INFO] cloning repository grenewode/i3switcher
[INFO] running `"git" "clone" "--bare" "git://github.com/grenewode/i3switcher.git" "work/cache/sources/gh/grenewode/i3switcher"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/grenewode/i3switcher'...
[INFO] running `"git" "clone" "work/cache/sources/gh/grenewode/i3switcher" "work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/grenewode/i3switcher"`
[INFO] [stderr] Cloning into 'work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/grenewode/i3switcher'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/grenewode/i3switcher" "work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/grenewode/i3switcher"`
[INFO] [stderr] Cloning into 'work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/grenewode/i3switcher'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e64777544167799a69f09d4dca873ad0cc819da7
[INFO] sha for GitHub repo grenewode/i3switcher: e64777544167799a69f09d4dca873ad0cc819da7
[INFO] validating manifest of grenewode/i3switcher on toolchain master#c8865d8e195813ade6b84434ac9f8850e7112d1a
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of grenewode/i3switcher on toolchain try#e212b7d492c96d3837691ba29d32d5f468933fb8
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing grenewode/i3switcher
[INFO] finished frobbing grenewode/i3switcher
[INFO] frobbed toml for grenewode/i3switcher written to work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/grenewode/i3switcher/Cargo.toml
[INFO] started frobbing grenewode/i3switcher
[INFO] finished frobbing grenewode/i3switcher
[INFO] frobbed toml for grenewode/i3switcher written to work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/grenewode/i3switcher/Cargo.toml
[INFO] crate grenewode/i3switcher already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing grenewode/i3switcher against master#c8865d8e195813ade6b84434ac9f8850e7112d1a for pr-61629
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-7/master#c8865d8e195813ade6b84434ac9f8850e7112d1a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/grenewode/i3switcher:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/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" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "build" "--frozen"`
[INFO] [stdout] 0501b7146f7f563e4dbea65b0b9452b27f135c5211cdf4a030d6ba8c23bdeb64
[INFO] running `"docker" "start" "-a" "0501b7146f7f563e4dbea65b0b9452b27f135c5211cdf4a030d6ba8c23bdeb64"`
[INFO] [stderr]    Compiling libc v0.2.29
[INFO] [stderr]    Compiling unicode-segmentation v1.2.0
[INFO] [stderr]    Compiling i3ipc v0.8.2
[INFO] [stderr]    Compiling term_size v0.3.0
[INFO] [stderr]    Compiling atty v0.2.2
[INFO] [stderr]    Compiling textwrap v0.7.0
[INFO] [stderr]    Compiling clap v2.26.0
[INFO] [stderr]    Compiling i3switcher v0.3.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:17:17
[INFO] [stderr]    |
[INFO] [stderr] 17 |             let mut iter = workspaces.iter().rev().skip(workspaces.len() - current_idx);
[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]     Finished dev [unoptimized + debuginfo] target(s) in 28.05s
[INFO] running `"docker" "inspect" "0501b7146f7f563e4dbea65b0b9452b27f135c5211cdf4a030d6ba8c23bdeb64"`
[INFO] running `"docker" "rm" "-f" "0501b7146f7f563e4dbea65b0b9452b27f135c5211cdf4a030d6ba8c23bdeb64"`
[INFO] [stdout] 0501b7146f7f563e4dbea65b0b9452b27f135c5211cdf4a030d6ba8c23bdeb64
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-7/master#c8865d8e195813ade6b84434ac9f8850e7112d1a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/grenewode/i3switcher:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/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" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "test" "--frozen" "--no-run"`
[INFO] [stdout] 4c3471b8255ae4e441b0cd7073fe0670ef8e19f9921c4bc0edefcfe165f20451
[INFO] running `"docker" "start" "-a" "4c3471b8255ae4e441b0cd7073fe0670ef8e19f9921c4bc0edefcfe165f20451"`
[INFO] [stderr]    Compiling i3switcher v0.3.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:17:17
[INFO] [stderr]    |
[INFO] [stderr] 17 |             let mut iter = workspaces.iter().rev().skip(workspaces.len() - current_idx);
[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]     Finished dev [unoptimized + debuginfo] target(s) in 0.84s
[INFO] running `"docker" "inspect" "4c3471b8255ae4e441b0cd7073fe0670ef8e19f9921c4bc0edefcfe165f20451"`
[INFO] running `"docker" "rm" "-f" "4c3471b8255ae4e441b0cd7073fe0670ef8e19f9921c4bc0edefcfe165f20451"`
[INFO] [stdout] 4c3471b8255ae4e441b0cd7073fe0670ef8e19f9921c4bc0edefcfe165f20451
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-7/master#c8865d8e195813ade6b84434ac9f8850e7112d1a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/grenewode/i3switcher:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/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" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "test" "--frozen"`
[INFO] [stdout] 565ef91a5e1b9fa480656053d90268169ac0fb19a9d4bb79680acb93514d981f
[INFO] running `"docker" "start" "-a" "565ef91a5e1b9fa480656053d90268169ac0fb19a9d4bb79680acb93514d981f"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/i3switcher-e169434ead943915
[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" "565ef91a5e1b9fa480656053d90268169ac0fb19a9d4bb79680acb93514d981f"`
[INFO] running `"docker" "rm" "-f" "565ef91a5e1b9fa480656053d90268169ac0fb19a9d4bb79680acb93514d981f"`
[INFO] [stdout] 565ef91a5e1b9fa480656053d90268169ac0fb19a9d4bb79680acb93514d981f