[INFO] updating cached repository misson20000/transistor-serial-driver
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/misson20000/transistor-serial-driver
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/misson20000/transistor-serial-driver" "work/ex/beta-1.37-6/sources/1.36.0/gh/misson20000/transistor-serial-driver"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/misson20000/transistor-serial-driver'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/misson20000/transistor-serial-driver" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/misson20000/transistor-serial-driver"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/misson20000/transistor-serial-driver'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d540cc8a62779418b9f176defbf846132d486f79
[INFO] sha for GitHub repo misson20000/transistor-serial-driver: d540cc8a62779418b9f176defbf846132d486f79
[INFO] validating manifest of misson20000/transistor-serial-driver on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of misson20000/transistor-serial-driver on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing misson20000/transistor-serial-driver
[INFO] finished frobbing misson20000/transistor-serial-driver
[INFO] frobbed toml for misson20000/transistor-serial-driver written to work/ex/beta-1.37-6/sources/1.36.0/gh/misson20000/transistor-serial-driver/Cargo.toml
[INFO] started frobbing misson20000/transistor-serial-driver
[INFO] finished frobbing misson20000/transistor-serial-driver
[INFO] frobbed toml for misson20000/transistor-serial-driver written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/misson20000/transistor-serial-driver/Cargo.toml
[INFO] crate misson20000/transistor-serial-driver already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing misson20000/transistor-serial-driver against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/misson20000/transistor-serial-driver:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] dbac86fd8097696c0400d94b82cccb9c4c43348983ec97da640f15657b9adf78
[INFO] running `"docker" "start" "-a" "dbac86fd8097696c0400d94b82cccb9c4c43348983ec97da640f15657b9adf78"`
[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 serial_driver_output_only v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/main.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     for mut device in try!(context.devices()).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 4.38s
[INFO] running `"docker" "inspect" "dbac86fd8097696c0400d94b82cccb9c4c43348983ec97da640f15657b9adf78"`
[INFO] running `"docker" "rm" "-f" "dbac86fd8097696c0400d94b82cccb9c4c43348983ec97da640f15657b9adf78"`
[INFO] [stdout] dbac86fd8097696c0400d94b82cccb9c4c43348983ec97da640f15657b9adf78
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/misson20000/transistor-serial-driver:/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 871825e1ef7d64fbad8671c6b9100d73d153395c57b3d3366a187a552ababec6
[INFO] running `"docker" "start" "-a" "871825e1ef7d64fbad8671c6b9100d73d153395c57b3d3366a187a552ababec6"`
[INFO] [stderr]    Compiling serial_driver_output_only v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/main.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     for mut device in try!(context.devices()).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 1.03s
[INFO] running `"docker" "inspect" "871825e1ef7d64fbad8671c6b9100d73d153395c57b3d3366a187a552ababec6"`
[INFO] running `"docker" "rm" "-f" "871825e1ef7d64fbad8671c6b9100d73d153395c57b3d3366a187a552ababec6"`
[INFO] [stdout] 871825e1ef7d64fbad8671c6b9100d73d153395c57b3d3366a187a552ababec6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/misson20000/transistor-serial-driver:/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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] d2b3ad3760e540cc5655b8df14b91ba55d85d8cfa8f6b26fd28b1207b671600b
[INFO] running `"docker" "start" "-a" "d2b3ad3760e540cc5655b8df14b91ba55d85d8cfa8f6b26fd28b1207b671600b"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/serial_driver_output_only-69b40567b3ebab36
[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" "d2b3ad3760e540cc5655b8df14b91ba55d85d8cfa8f6b26fd28b1207b671600b"`
[INFO] running `"docker" "rm" "-f" "d2b3ad3760e540cc5655b8df14b91ba55d85d8cfa8f6b26fd28b1207b671600b"`
[INFO] [stdout] d2b3ad3760e540cc5655b8df14b91ba55d85d8cfa8f6b26fd28b1207b671600b