[INFO] updating cached repository Elrohil44/Chat
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Elrohil44/Chat
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Elrohil44/Chat" "work/ex/beta-1.38-1/sources/1.37.0/gh/Elrohil44/Chat"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Elrohil44/Chat'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Elrohil44/Chat" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Elrohil44/Chat"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Elrohil44/Chat'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3530bf8acef7cc2c527da831b0fd2f1a0ecbb88d
[INFO] sha for GitHub repo Elrohil44/Chat: 3530bf8acef7cc2c527da831b0fd2f1a0ecbb88d
[INFO] validating manifest of Elrohil44/Chat 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 Elrohil44/Chat 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 Elrohil44/Chat
[INFO] finished frobbing Elrohil44/Chat
[INFO] frobbed toml for Elrohil44/Chat written to work/ex/beta-1.38-1/sources/1.37.0/gh/Elrohil44/Chat/Cargo.toml
[INFO] started frobbing Elrohil44/Chat
[INFO] finished frobbing Elrohil44/Chat
[INFO] frobbed toml for Elrohil44/Chat written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Elrohil44/Chat/Cargo.toml
[INFO] crate Elrohil44/Chat 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 Elrohil44/Chat 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Elrohil44/Chat:/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] 8cfa969b3b330bab09b679015b941f476d9afeebd6b16970b8fab81d7bd9516f
[INFO] running `"docker" "start" "-a" "8cfa969b3b330bab09b679015b941f476d9afeebd6b16970b8fab81d7bd9516f"`
[INFO] [stderr]    Compiling threadpool v1.7.1
[INFO] [stderr]    Compiling chat v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/server.rs:89:37
[INFO] [stderr]    |
[INFO] [stderr] 89 |                                 let mut clients_locked = clients.lock().unwrap();
[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 3.26s
[INFO] running `"docker" "inspect" "8cfa969b3b330bab09b679015b941f476d9afeebd6b16970b8fab81d7bd9516f"`
[INFO] running `"docker" "rm" "-f" "8cfa969b3b330bab09b679015b941f476d9afeebd6b16970b8fab81d7bd9516f"`
[INFO] [stdout] 8cfa969b3b330bab09b679015b941f476d9afeebd6b16970b8fab81d7bd9516f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Elrohil44/Chat:/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] e0bbba93eb4498e3568166acd79f423eec1b033843683661381df2994872bcf6
[INFO] running `"docker" "start" "-a" "e0bbba93eb4498e3568166acd79f423eec1b033843683661381df2994872bcf6"`
[INFO] [stderr]    Compiling chat v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/server.rs:89:37
[INFO] [stderr]    |
[INFO] [stderr] 89 |                                 let mut clients_locked = clients.lock().unwrap();
[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 1.21s
[INFO] running `"docker" "inspect" "e0bbba93eb4498e3568166acd79f423eec1b033843683661381df2994872bcf6"`
[INFO] running `"docker" "rm" "-f" "e0bbba93eb4498e3568166acd79f423eec1b033843683661381df2994872bcf6"`
[INFO] [stdout] e0bbba93eb4498e3568166acd79f423eec1b033843683661381df2994872bcf6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Elrohil44/Chat:/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] d03b4b82bc3852c9199222ad54a7413a323fcfa9ac41d5db95c964f51d63936f
[INFO] running `"docker" "start" "-a" "d03b4b82bc3852c9199222ad54a7413a323fcfa9ac41d5db95c964f51d63936f"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/chat-cfef71cf89bcb638
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running /opt/crater/target/debug/deps/server-a465970338feaa7c
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[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" "d03b4b82bc3852c9199222ad54a7413a323fcfa9ac41d5db95c964f51d63936f"`
[INFO] running `"docker" "rm" "-f" "d03b4b82bc3852c9199222ad54a7413a323fcfa9ac41d5db95c964f51d63936f"`
[INFO] [stdout] d03b4b82bc3852c9199222ad54a7413a323fcfa9ac41d5db95c964f51d63936f