[INFO] updating cached repository m-g-dev/fbsep
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/m-g-dev/fbsep
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/m-g-dev/fbsep" "work/ex/beta-1.38-1/sources/1.37.0/gh/m-g-dev/fbsep"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/m-g-dev/fbsep'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/m-g-dev/fbsep" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/m-g-dev/fbsep"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/m-g-dev/fbsep'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] dadcccc02332f35a81014596f15aeb7e8dd9d124
[INFO] sha for GitHub repo m-g-dev/fbsep: dadcccc02332f35a81014596f15aeb7e8dd9d124
[INFO] validating manifest of m-g-dev/fbsep 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 m-g-dev/fbsep 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 m-g-dev/fbsep
[INFO] finished frobbing m-g-dev/fbsep
[INFO] frobbed toml for m-g-dev/fbsep written to work/ex/beta-1.38-1/sources/1.37.0/gh/m-g-dev/fbsep/Cargo.toml
[INFO] started frobbing m-g-dev/fbsep
[INFO] finished frobbing m-g-dev/fbsep
[INFO] frobbed toml for m-g-dev/fbsep written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/m-g-dev/fbsep/Cargo.toml
[INFO] crate m-g-dev/fbsep 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing m-g-dev/fbsep 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-0/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/m-g-dev/fbsep:/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] a58f60c3e564d0fd9e0dc384b92ef0fda6df179129ed30d7378fe1b2fb54acf0
[INFO] running `"docker" "start" "-a" "a58f60c3e564d0fd9e0dc384b92ef0fda6df179129ed30d7378fe1b2fb54acf0"`
[INFO] [stderr]    Compiling fbsep v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `greyscale`
[INFO] [stderr]  --> src/lib.rs:1:21
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn binarization(greyscale: &[u8]) -> i32 {
[INFO] [stderr]   |                     ^^^^^^^^^ help: consider prefixing with an underscore: `_greyscale`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.41s
[INFO] running `"docker" "inspect" "a58f60c3e564d0fd9e0dc384b92ef0fda6df179129ed30d7378fe1b2fb54acf0"`
[INFO] running `"docker" "rm" "-f" "a58f60c3e564d0fd9e0dc384b92ef0fda6df179129ed30d7378fe1b2fb54acf0"`
[INFO] [stdout] a58f60c3e564d0fd9e0dc384b92ef0fda6df179129ed30d7378fe1b2fb54acf0
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/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/m-g-dev/fbsep:/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] 86de11d4263a1cac00099d1d0930ff8c55e5da07aab9d0c62a047b7cd495f1c6
[INFO] running `"docker" "start" "-a" "86de11d4263a1cac00099d1d0930ff8c55e5da07aab9d0c62a047b7cd495f1c6"`
[INFO] [stderr]    Compiling fbsep v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `greyscale`
[INFO] [stderr]  --> src/lib.rs:1:21
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn binarization(greyscale: &[u8]) -> i32 {
[INFO] [stderr]   |                     ^^^^^^^^^ help: consider prefixing with an underscore: `_greyscale`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]  --> src/lib.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     fn a() {
[INFO] [stderr]   |     ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.97s
[INFO] running `"docker" "inspect" "86de11d4263a1cac00099d1d0930ff8c55e5da07aab9d0c62a047b7cd495f1c6"`
[INFO] running `"docker" "rm" "-f" "86de11d4263a1cac00099d1d0930ff8c55e5da07aab9d0c62a047b7cd495f1c6"`
[INFO] [stdout] 86de11d4263a1cac00099d1d0930ff8c55e5da07aab9d0c62a047b7cd495f1c6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/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/m-g-dev/fbsep:/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] 29df910f3be34b58ab8c23dd227eab759503d03512f982e834e9a02b964e591a
[INFO] running `"docker" "start" "-a" "29df910f3be34b58ab8c23dd227eab759503d03512f982e834e9a02b964e591a"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/fbsep-c65525cb023de3d9
[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] [stderr]    Doc-tests fbsep
[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" "29df910f3be34b58ab8c23dd227eab759503d03512f982e834e9a02b964e591a"`
[INFO] running `"docker" "rm" "-f" "29df910f3be34b58ab8c23dd227eab759503d03512f982e834e9a02b964e591a"`
[INFO] [stdout] 29df910f3be34b58ab8c23dd227eab759503d03512f982e834e9a02b964e591a