[INFO] updating cached repository arpith/chat-pubsub
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/arpith/chat-pubsub
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/arpith/chat-pubsub" "work/ex/beta-1.37-6/sources/1.36.0/gh/arpith/chat-pubsub"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/arpith/chat-pubsub'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/arpith/chat-pubsub" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/arpith/chat-pubsub"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/arpith/chat-pubsub'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7b0849e31d549adc36301f8ce5fdb4a85cc36405
[INFO] sha for GitHub repo arpith/chat-pubsub: 7b0849e31d549adc36301f8ce5fdb4a85cc36405
[INFO] validating manifest of arpith/chat-pubsub 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 arpith/chat-pubsub 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 arpith/chat-pubsub
[INFO] finished frobbing arpith/chat-pubsub
[INFO] frobbed toml for arpith/chat-pubsub written to work/ex/beta-1.37-6/sources/1.36.0/gh/arpith/chat-pubsub/Cargo.toml
[INFO] started frobbing arpith/chat-pubsub
[INFO] finished frobbing arpith/chat-pubsub
[INFO] frobbed toml for arpith/chat-pubsub written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/arpith/chat-pubsub/Cargo.toml
[INFO] crate arpith/chat-pubsub 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing arpith/chat-pubsub 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/gh/arpith/chat-pubsub:/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] 3b533829f899d07f43dde3f1627acc229041e8792a10a15e4c0d5aa461fb0db9
[INFO] running `"docker" "start" "-a" "3b533829f899d07f43dde3f1627acc229041e8792a10a15e4c0d5aa461fb0db9"`
[INFO] [stderr]    Compiling chat-pubsub v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:33:13
[INFO] [stderr]    |
[INFO] [stderr] 33 |         let mut stream_clone = stream.try_clone().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 1.66s
[INFO] running `"docker" "inspect" "3b533829f899d07f43dde3f1627acc229041e8792a10a15e4c0d5aa461fb0db9"`
[INFO] running `"docker" "rm" "-f" "3b533829f899d07f43dde3f1627acc229041e8792a10a15e4c0d5aa461fb0db9"`
[INFO] [stdout] 3b533829f899d07f43dde3f1627acc229041e8792a10a15e4c0d5aa461fb0db9
[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/gh/arpith/chat-pubsub:/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] 8dd6d7d2171e54a28c658e9aeda4775c8fd55f3139594b214e3b04dd4e0258fc
[INFO] running `"docker" "start" "-a" "8dd6d7d2171e54a28c658e9aeda4775c8fd55f3139594b214e3b04dd4e0258fc"`
[INFO] [stderr]    Compiling chat-pubsub v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:33:13
[INFO] [stderr]    |
[INFO] [stderr] 33 |         let mut stream_clone = stream.try_clone().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 0.64s
[INFO] running `"docker" "inspect" "8dd6d7d2171e54a28c658e9aeda4775c8fd55f3139594b214e3b04dd4e0258fc"`
[INFO] running `"docker" "rm" "-f" "8dd6d7d2171e54a28c658e9aeda4775c8fd55f3139594b214e3b04dd4e0258fc"`
[INFO] [stdout] 8dd6d7d2171e54a28c658e9aeda4775c8fd55f3139594b214e3b04dd4e0258fc
[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/gh/arpith/chat-pubsub:/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] ac2a7509e716d34c55246f9734976e9837cbe4116852219dbff5a88cd52b0632
[INFO] running `"docker" "start" "-a" "ac2a7509e716d34c55246f9734976e9837cbe4116852219dbff5a88cd52b0632"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/chat_pubsub-eff7c97adece3d70
[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" "ac2a7509e716d34c55246f9734976e9837cbe4116852219dbff5a88cd52b0632"`
[INFO] running `"docker" "rm" "-f" "ac2a7509e716d34c55246f9734976e9837cbe4116852219dbff5a88cd52b0632"`
[INFO] [stdout] ac2a7509e716d34c55246f9734976e9837cbe4116852219dbff5a88cd52b0632