[INFO] updating cached repository krishnakumar4a4/usb
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/krishnakumar4a4/usb
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/krishnakumar4a4/usb" "work/ex/beta-1.38-1/sources/1.37.0/gh/krishnakumar4a4/usb"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/krishnakumar4a4/usb'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/krishnakumar4a4/usb" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/krishnakumar4a4/usb"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/krishnakumar4a4/usb'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f679dd58f7a91d7558b2c66cad3c131c731d36ff
[INFO] sha for GitHub repo krishnakumar4a4/usb: f679dd58f7a91d7558b2c66cad3c131c731d36ff
[INFO] validating manifest of krishnakumar4a4/usb on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of krishnakumar4a4/usb on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing krishnakumar4a4/usb
[INFO] finished frobbing krishnakumar4a4/usb
[INFO] frobbed toml for krishnakumar4a4/usb written to work/ex/beta-1.38-1/sources/1.37.0/gh/krishnakumar4a4/usb/Cargo.toml
[INFO] started frobbing krishnakumar4a4/usb
[INFO] finished frobbing krishnakumar4a4/usb
[INFO] frobbed toml for krishnakumar4a4/usb written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/krishnakumar4a4/usb/Cargo.toml
[INFO] crate krishnakumar4a4/usb already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing krishnakumar4a4/usb against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/krishnakumar4a4/usb:/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=warn" "-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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 0365d051603a181bc8704086b7d113e9aa6ed1d612b39e0017c6120fa750f650
[INFO] running `"docker" "start" "-a" "0365d051603a181bc8704086b7d113e9aa6ed1d612b39e0017c6120fa750f650"`
[INFO] [stderr]    Compiling libusb-sys v0.2.3
[INFO] [stderr]    Compiling bit-set v0.2.0
[INFO] [stderr]    Compiling libusb v0.3.0
[INFO] [stderr]    Compiling usb v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::slice`
[INFO] [stderr]  --> src/main.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::slice;
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/main.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     for mut device in context.devices().unwrap().iter() {
[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 3.11s
[INFO] running `"docker" "inspect" "0365d051603a181bc8704086b7d113e9aa6ed1d612b39e0017c6120fa750f650"`
[INFO] running `"docker" "rm" "-f" "0365d051603a181bc8704086b7d113e9aa6ed1d612b39e0017c6120fa750f650"`
[INFO] [stdout] 0365d051603a181bc8704086b7d113e9aa6ed1d612b39e0017c6120fa750f650
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/krishnakumar4a4/usb:/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=warn" "-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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] cf60c189c5c509b79f8637d32dfa0b3851d661d3cd3a85f69a73349798e9db87
[INFO] running `"docker" "start" "-a" "cf60c189c5c509b79f8637d32dfa0b3851d661d3cd3a85f69a73349798e9db87"`
[INFO] [stderr]    Compiling usb v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::slice`
[INFO] [stderr]  --> src/main.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::slice;
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/main.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     for mut device in context.devices().unwrap().iter() {
[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 0.59s
[INFO] running `"docker" "inspect" "cf60c189c5c509b79f8637d32dfa0b3851d661d3cd3a85f69a73349798e9db87"`
[INFO] running `"docker" "rm" "-f" "cf60c189c5c509b79f8637d32dfa0b3851d661d3cd3a85f69a73349798e9db87"`
[INFO] [stdout] cf60c189c5c509b79f8637d32dfa0b3851d661d3cd3a85f69a73349798e9db87
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/krishnakumar4a4/usb:/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=warn" "-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" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 0fe7751f49f491379e1df3132037a0bcbb8b4e92b4200c71fc320ced9458cf66
[INFO] running `"docker" "start" "-a" "0fe7751f49f491379e1df3132037a0bcbb8b4e92b4200c71fc320ced9458cf66"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/usb-5f079386a6083cc7
[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" "0fe7751f49f491379e1df3132037a0bcbb8b4e92b4200c71fc320ced9458cf66"`
[INFO] running `"docker" "rm" "-f" "0fe7751f49f491379e1df3132037a0bcbb8b4e92b4200c71fc320ced9458cf66"`
[INFO] [stdout] 0fe7751f49f491379e1df3132037a0bcbb8b4e92b4200c71fc320ced9458cf66