[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-1.38-1/sources/1.37.0/gh/misson20000/transistor-serial-driver"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/misson20000/transistor-serial-driver'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/misson20000/transistor-serial-driver" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/misson20000/transistor-serial-driver"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/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 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of misson20000/transistor-serial-driver 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 misson20000/transistor-serial-driver
[INFO] finished frobbing misson20000/transistor-serial-driver
[INFO] frobbed toml for misson20000/transistor-serial-driver written to work/ex/beta-1.38-1/sources/1.37.0/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-1.38-1/sources/beta-2019-08-13/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" "+1.37.0" "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 misson20000/transistor-serial-driver 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-6/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/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 197c5d78c3bfb7d1bf8f4e97b437cb797c60c6140f55526032149592e9ec790e
[INFO] running `"docker" "start" "-a" "197c5d78c3bfb7d1bf8f4e97b437cb797c60c6140f55526032149592e9ec790e"`
[INFO] [stderr]    Compiling libusb-sys v0.2.3
[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 3.14s
[INFO] running `"docker" "inspect" "197c5d78c3bfb7d1bf8f4e97b437cb797c60c6140f55526032149592e9ec790e"`
[INFO] running `"docker" "rm" "-f" "197c5d78c3bfb7d1bf8f4e97b437cb797c60c6140f55526032149592e9ec790e"`
[INFO] [stdout] 197c5d78c3bfb7d1bf8f4e97b437cb797c60c6140f55526032149592e9ec790e
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/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/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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 2f9592e35f10713bb8c5d9d8bff65b7616b2da6830e54d35d9f66ee851dd5728
[INFO] running `"docker" "start" "-a" "2f9592e35f10713bb8c5d9d8bff65b7616b2da6830e54d35d9f66ee851dd5728"`
[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 0.95s
[INFO] running `"docker" "inspect" "2f9592e35f10713bb8c5d9d8bff65b7616b2da6830e54d35d9f66ee851dd5728"`
[INFO] running `"docker" "rm" "-f" "2f9592e35f10713bb8c5d9d8bff65b7616b2da6830e54d35d9f66ee851dd5728"`
[INFO] [stdout] 2f9592e35f10713bb8c5d9d8bff65b7616b2da6830e54d35d9f66ee851dd5728
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/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/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" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 1ce74d4473b416bb29f2bdacfadbca58bf972a1ddec30b742c8ea08fea7f7ebb
[INFO] running `"docker" "start" "-a" "1ce74d4473b416bb29f2bdacfadbca58bf972a1ddec30b742c8ea08fea7f7ebb"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/serial_driver_output_only-a15650863a757c4d
[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" "1ce74d4473b416bb29f2bdacfadbca58bf972a1ddec30b742c8ea08fea7f7ebb"`
[INFO] running `"docker" "rm" "-f" "1ce74d4473b416bb29f2bdacfadbca58bf972a1ddec30b742c8ea08fea7f7ebb"`
[INFO] [stdout] 1ce74d4473b416bb29f2bdacfadbca58bf972a1ddec30b742c8ea08fea7f7ebb