[INFO] updating cached repository dctk/chatserver_rust_sample
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/dctk/chatserver_rust_sample
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/dctk/chatserver_rust_sample" "work/ex/beta-1.37-6/sources/1.36.0/gh/dctk/chatserver_rust_sample"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/dctk/chatserver_rust_sample'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/dctk/chatserver_rust_sample" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dctk/chatserver_rust_sample"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dctk/chatserver_rust_sample'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 882e907a97202e88ef876cd38e7d9ac0389bcdae
[INFO] sha for GitHub repo dctk/chatserver_rust_sample: 882e907a97202e88ef876cd38e7d9ac0389bcdae
[INFO] validating manifest of dctk/chatserver_rust_sample 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 dctk/chatserver_rust_sample 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 dctk/chatserver_rust_sample
[INFO] finished frobbing dctk/chatserver_rust_sample
[INFO] frobbed toml for dctk/chatserver_rust_sample written to work/ex/beta-1.37-6/sources/1.36.0/gh/dctk/chatserver_rust_sample/Cargo.toml
[INFO] started frobbing dctk/chatserver_rust_sample
[INFO] finished frobbing dctk/chatserver_rust_sample
[INFO] frobbed toml for dctk/chatserver_rust_sample written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dctk/chatserver_rust_sample/Cargo.toml
[INFO] crate dctk/chatserver_rust_sample 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] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing dctk/chatserver_rust_sample 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-0/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dctk/chatserver_rust_sample:/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] 676917baa776ee13cf916623c64c74f2d1bc34a87776d300f648041a7aa00731
[INFO] running `"docker" "start" "-a" "676917baa776ee13cf916623c64c74f2d1bc34a87776d300f648041a7aa00731"`
[INFO] [stderr]    Compiling chatserver v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `message_len` is never read
[INFO] [stderr]    --> src/main.rs:138:45
[INFO] [stderr]     |
[INFO] [stderr] 138 |                                     let mut message_len: usize = 0;
[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 1.07s
[INFO] running `"docker" "inspect" "676917baa776ee13cf916623c64c74f2d1bc34a87776d300f648041a7aa00731"`
[INFO] running `"docker" "rm" "-f" "676917baa776ee13cf916623c64c74f2d1bc34a87776d300f648041a7aa00731"`
[INFO] [stdout] 676917baa776ee13cf916623c64c74f2d1bc34a87776d300f648041a7aa00731
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dctk/chatserver_rust_sample:/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] a7cece9d5913423415a4956250836bce99d9ef90e95dcdf7210c528204964913
[INFO] running `"docker" "start" "-a" "a7cece9d5913423415a4956250836bce99d9ef90e95dcdf7210c528204964913"`
[INFO] [stderr]    Compiling chatserver v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `message_len` is never read
[INFO] [stderr]    --> src/main.rs:138:45
[INFO] [stderr]     |
[INFO] [stderr] 138 |                                     let mut message_len: usize = 0;
[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 0.81s
[INFO] running `"docker" "inspect" "a7cece9d5913423415a4956250836bce99d9ef90e95dcdf7210c528204964913"`
[INFO] running `"docker" "rm" "-f" "a7cece9d5913423415a4956250836bce99d9ef90e95dcdf7210c528204964913"`
[INFO] [stdout] a7cece9d5913423415a4956250836bce99d9ef90e95dcdf7210c528204964913
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dctk/chatserver_rust_sample:/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] 6afee277d3a302b8dac44d064a2160a9d3d29afaaa1649d1347abe578ccf7db4
[INFO] running `"docker" "start" "-a" "6afee277d3a302b8dac44d064a2160a9d3d29afaaa1649d1347abe578ccf7db4"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/chatserver-bbc0c44b97879653
[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" "6afee277d3a302b8dac44d064a2160a9d3d29afaaa1649d1347abe578ccf7db4"`
[INFO] running `"docker" "rm" "-f" "6afee277d3a302b8dac44d064a2160a9d3d29afaaa1649d1347abe578ccf7db4"`
[INFO] [stdout] 6afee277d3a302b8dac44d064a2160a9d3d29afaaa1649d1347abe578ccf7db4