[INFO] updating cached repository mpdrescher/huffman-compression
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mpdrescher/huffman-compression
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mpdrescher/huffman-compression" "work/ex/beta-1.38-1/sources/1.37.0/gh/mpdrescher/huffman-compression"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/mpdrescher/huffman-compression'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mpdrescher/huffman-compression" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mpdrescher/huffman-compression"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mpdrescher/huffman-compression'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f7270fd9505444ab81fa668aac53c656adf94f96
[INFO] sha for GitHub repo mpdrescher/huffman-compression: f7270fd9505444ab81fa668aac53c656adf94f96
[INFO] validating manifest of mpdrescher/huffman-compression 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 mpdrescher/huffman-compression 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 mpdrescher/huffman-compression
[INFO] finished frobbing mpdrescher/huffman-compression
[INFO] frobbed toml for mpdrescher/huffman-compression written to work/ex/beta-1.38-1/sources/1.37.0/gh/mpdrescher/huffman-compression/Cargo.toml
[INFO] started frobbing mpdrescher/huffman-compression
[INFO] finished frobbing mpdrescher/huffman-compression
[INFO] frobbed toml for mpdrescher/huffman-compression written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mpdrescher/huffman-compression/Cargo.toml
[INFO] crate mpdrescher/huffman-compression 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 mpdrescher/huffman-compression against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/mpdrescher/huffman-compression:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] af9843a1a534c4ea5c7f939a67e978bac34d591202607c652f65ab8b632a26b8
[INFO] running `"docker" "start" "-a" "af9843a1a534c4ea5c7f939a67e978bac34d591202607c652f65ab8b632a26b8"`
[INFO] [stderr]    Compiling huffman v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `cur_byte` is never read
[INFO] [stderr]    --> src/huffmantree.rs:188:11
[INFO] [stderr]     |
[INFO] [stderr] 188 |         let mut cur_byte: u8 = 4;
[INFO] [stderr]     |                 ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.01s
[INFO] running `"docker" "inspect" "af9843a1a534c4ea5c7f939a67e978bac34d591202607c652f65ab8b632a26b8"`
[INFO] running `"docker" "rm" "-f" "af9843a1a534c4ea5c7f939a67e978bac34d591202607c652f65ab8b632a26b8"`
[INFO] [stdout] af9843a1a534c4ea5c7f939a67e978bac34d591202607c652f65ab8b632a26b8
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/mpdrescher/huffman-compression:/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] d6957684e3d53e35d7e7f31ff49f9ad65371def21df892864a99e732e0e31afa
[INFO] running `"docker" "start" "-a" "d6957684e3d53e35d7e7f31ff49f9ad65371def21df892864a99e732e0e31afa"`
[INFO] [stderr]    Compiling huffman v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `cur_byte` is never read
[INFO] [stderr]    --> src/huffmantree.rs:188:11
[INFO] [stderr]     |
[INFO] [stderr] 188 |         let mut cur_byte: u8 = 4;
[INFO] [stderr]     |                 ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.93s
[INFO] running `"docker" "inspect" "d6957684e3d53e35d7e7f31ff49f9ad65371def21df892864a99e732e0e31afa"`
[INFO] running `"docker" "rm" "-f" "d6957684e3d53e35d7e7f31ff49f9ad65371def21df892864a99e732e0e31afa"`
[INFO] [stdout] d6957684e3d53e35d7e7f31ff49f9ad65371def21df892864a99e732e0e31afa
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/mpdrescher/huffman-compression:/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] 53ee49c3603fb064708c02913af9d86782460ea9904e66799625e0bd0c99ca4b
[INFO] running `"docker" "start" "-a" "53ee49c3603fb064708c02913af9d86782460ea9904e66799625e0bd0c99ca4b"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/huffman-e5f61963b4a84113
[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" "53ee49c3603fb064708c02913af9d86782460ea9904e66799625e0bd0c99ca4b"`
[INFO] running `"docker" "rm" "-f" "53ee49c3603fb064708c02913af9d86782460ea9904e66799625e0bd0c99ca4b"`
[INFO] [stdout] 53ee49c3603fb064708c02913af9d86782460ea9904e66799625e0bd0c99ca4b