[INFO] fetching crate stego 0.1.4...
[INFO] extracting crate stego 0.1.4 into work/ex/beta-1.37-6/sources/1.36.0/reg/stego/0.1.4
[INFO] extracting crate stego 0.1.4 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/stego/0.1.4
[INFO] validating manifest of stego-0.1.4 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 stego-0.1.4 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 stego-0.1.4
[INFO] finished frobbing stego-0.1.4
[INFO] frobbed toml for stego-0.1.4 written to work/ex/beta-1.37-6/sources/1.36.0/reg/stego/0.1.4/Cargo.toml
[INFO] started frobbing stego-0.1.4
[INFO] finished frobbing stego-0.1.4
[INFO] frobbed toml for stego-0.1.4 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/stego/0.1.4/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 stego-0.1.4 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/stego/0.1.4:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 28aa4335763c408cd3695a0c955611df5443250c3c685f441f06313cb4d20da4
[INFO] running `"docker" "start" "-a" "28aa4335763c408cd3695a0c955611df5443250c3c685f441f06313cb4d20da4"`
[INFO] [stderr]    Compiling png v0.14.1
[INFO] [stderr]    Compiling tiff v0.2.2
[INFO] [stderr]    Compiling pretty_env_logger v0.3.0
[INFO] [stderr]    Compiling image v0.21.2
[INFO] [stderr]    Compiling stego v0.1.4 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:111:17
[INFO] [stderr]     |
[INFO] [stderr] 111 |             let mut im2;
[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 18.53s
[INFO] running `"docker" "inspect" "28aa4335763c408cd3695a0c955611df5443250c3c685f441f06313cb4d20da4"`
[INFO] running `"docker" "rm" "-f" "28aa4335763c408cd3695a0c955611df5443250c3c685f441f06313cb4d20da4"`
[INFO] [stdout] 28aa4335763c408cd3695a0c955611df5443250c3c685f441f06313cb4d20da4
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/stego/0.1.4:/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-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] 8a09d50aca722dbb7d5a0944af88dda89941bec67d7fb92798e9456023a0c729
[INFO] running `"docker" "start" "-a" "8a09d50aca722dbb7d5a0944af88dda89941bec67d7fb92798e9456023a0c729"`
[INFO] [stderr]    Compiling stego v0.1.4 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:111:17
[INFO] [stderr]     |
[INFO] [stderr] 111 |             let mut im2;
[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 2.83s
[INFO] running `"docker" "inspect" "8a09d50aca722dbb7d5a0944af88dda89941bec67d7fb92798e9456023a0c729"`
[INFO] running `"docker" "rm" "-f" "8a09d50aca722dbb7d5a0944af88dda89941bec67d7fb92798e9456023a0c729"`
[INFO] [stdout] 8a09d50aca722dbb7d5a0944af88dda89941bec67d7fb92798e9456023a0c729
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/stego/0.1.4:/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-2019-07-23" "test" "--frozen"`
[INFO] [stdout] 2a7f08d2994addc7049eac1dd2e971307cec3e717ecfd00c1721b3cc09c304ea
[INFO] running `"docker" "start" "-a" "2a7f08d2994addc7049eac1dd2e971307cec3e717ecfd00c1721b3cc09c304ea"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.09s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/stego-575860ff79a4d33c
[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]      Running /opt/crater/target/debug/deps/stego-5c41ab50c00a3c8a
[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]      Running /opt/crater/target/debug/deps/common-065b016ff9b52f09
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test encode_decode_text ... ok
[INFO] [stdout] test encode_decode_binary ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests stego
[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" "2a7f08d2994addc7049eac1dd2e971307cec3e717ecfd00c1721b3cc09c304ea"`
[INFO] running `"docker" "rm" "-f" "2a7f08d2994addc7049eac1dd2e971307cec3e717ecfd00c1721b3cc09c304ea"`
[INFO] [stdout] 2a7f08d2994addc7049eac1dd2e971307cec3e717ecfd00c1721b3cc09c304ea