[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-1.38-1/sources/1.37.0/gh/arpith/chat-pubsub"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/arpith/chat-pubsub'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/arpith/chat-pubsub" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/arpith/chat-pubsub"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/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 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of arpith/chat-pubsub 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 arpith/chat-pubsub
[INFO] finished frobbing arpith/chat-pubsub
[INFO] frobbed toml for arpith/chat-pubsub written to work/ex/beta-1.38-1/sources/1.37.0/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-1.38-1/sources/beta-2019-08-13/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" "+1.37.0" "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 arpith/chat-pubsub against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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-2019-08-13" "build" "--frozen"`
[INFO] [stdout] fbc4cf2c43aba5abf1309be4511f24cc1acdcdc1736a8375046bd529ce505d2a
[INFO] running `"docker" "start" "-a" "fbc4cf2c43aba5abf1309be4511f24cc1acdcdc1736a8375046bd529ce505d2a"`
[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 2.08s
[INFO] running `"docker" "inspect" "fbc4cf2c43aba5abf1309be4511f24cc1acdcdc1736a8375046bd529ce505d2a"`
[INFO] running `"docker" "rm" "-f" "fbc4cf2c43aba5abf1309be4511f24cc1acdcdc1736a8375046bd529ce505d2a"`
[INFO] [stdout] fbc4cf2c43aba5abf1309be4511f24cc1acdcdc1736a8375046bd529ce505d2a
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] f7b618b4d93778d6237e07091697837478ecd155d5af9f85b6084b62dfe5a715
[INFO] running `"docker" "start" "-a" "f7b618b4d93778d6237e07091697837478ecd155d5af9f85b6084b62dfe5a715"`
[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 0.81s
[INFO] running `"docker" "inspect" "f7b618b4d93778d6237e07091697837478ecd155d5af9f85b6084b62dfe5a715"`
[INFO] running `"docker" "rm" "-f" "f7b618b4d93778d6237e07091697837478ecd155d5af9f85b6084b62dfe5a715"`
[INFO] [stdout] f7b618b4d93778d6237e07091697837478ecd155d5af9f85b6084b62dfe5a715
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 457bcb890f4af0c1716646bc4bdb88ae3103fde6023fbd6b9227ec22c3f7a074
[INFO] running `"docker" "start" "-a" "457bcb890f4af0c1716646bc4bdb88ae3103fde6023fbd6b9227ec22c3f7a074"`
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running /opt/crater/target/debug/deps/chat_pubsub-431daa5391ef56f8
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "457bcb890f4af0c1716646bc4bdb88ae3103fde6023fbd6b9227ec22c3f7a074"`
[INFO] running `"docker" "rm" "-f" "457bcb890f4af0c1716646bc4bdb88ae3103fde6023fbd6b9227ec22c3f7a074"`
[INFO] [stdout] 457bcb890f4af0c1716646bc4bdb88ae3103fde6023fbd6b9227ec22c3f7a074