[INFO] updating cached repository demostf/sync-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/demostf/sync-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/demostf/sync-rs" "work/ex/beta-1.37-6/sources/1.36.0/gh/demostf/sync-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/demostf/sync-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/demostf/sync-rs" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/demostf/sync-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/demostf/sync-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2f59220df54d22bebd35172e6594837c1ce4a666
[INFO] sha for GitHub repo demostf/sync-rs: 2f59220df54d22bebd35172e6594837c1ce4a666
[INFO] validating manifest of demostf/sync-rs 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 demostf/sync-rs 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 demostf/sync-rs
[INFO] finished frobbing demostf/sync-rs
[INFO] frobbed toml for demostf/sync-rs written to work/ex/beta-1.37-6/sources/1.36.0/gh/demostf/sync-rs/Cargo.toml
[INFO] started frobbing demostf/sync-rs
[INFO] finished frobbing demostf/sync-rs
[INFO] frobbed toml for demostf/sync-rs written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/demostf/sync-rs/Cargo.toml
[INFO] crate demostf/sync-rs 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 demostf/sync-rs 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-5/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/demostf/sync-rs:/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] 0dbd08d2b8b86ace22024880375d011e13dcfa0448e7b6dbdc5589402d3c4c15
[INFO] running `"docker" "start" "-a" "0dbd08d2b8b86ace22024880375d011e13dcfa0448e7b6dbdc5589402d3c4c15"`
[INFO] [stderr]    Compiling iovec v0.1.1
[INFO] [stderr]    Compiling net2 v0.2.31
[INFO] [stderr]    Compiling serde_json v1.0.3
[INFO] [stderr]    Compiling bytes v0.4.5
[INFO] [stderr]    Compiling mio v0.6.10
[INFO] [stderr]    Compiling ws v0.7.3
[INFO] [stderr]    Compiling sync v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:49:22
[INFO] [stderr]    |
[INFO] [stderr] 49 |                 Some(mut session) => {
[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 17.23s
[INFO] running `"docker" "inspect" "0dbd08d2b8b86ace22024880375d011e13dcfa0448e7b6dbdc5589402d3c4c15"`
[INFO] running `"docker" "rm" "-f" "0dbd08d2b8b86ace22024880375d011e13dcfa0448e7b6dbdc5589402d3c4c15"`
[INFO] [stdout] 0dbd08d2b8b86ace22024880375d011e13dcfa0448e7b6dbdc5589402d3c4c15
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-5/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/demostf/sync-rs:/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] 60595bfabb7c669ed082f4745bde5ddd8864e3054be3a3fa1431b5ea7185b8f2
[INFO] running `"docker" "start" "-a" "60595bfabb7c669ed082f4745bde5ddd8864e3054be3a3fa1431b5ea7185b8f2"`
[INFO] [stderr]    Compiling sync v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:49:22
[INFO] [stderr]    |
[INFO] [stderr] 49 |                 Some(mut session) => {
[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 1.23s
[INFO] running `"docker" "inspect" "60595bfabb7c669ed082f4745bde5ddd8864e3054be3a3fa1431b5ea7185b8f2"`
[INFO] running `"docker" "rm" "-f" "60595bfabb7c669ed082f4745bde5ddd8864e3054be3a3fa1431b5ea7185b8f2"`
[INFO] [stdout] 60595bfabb7c669ed082f4745bde5ddd8864e3054be3a3fa1431b5ea7185b8f2
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-5/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/demostf/sync-rs:/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] 9ca169f83d888eebedf1e07367e61707b27b203d83f481ee2318a1cfdc33a988
[INFO] running `"docker" "start" "-a" "9ca169f83d888eebedf1e07367e61707b27b203d83f481ee2318a1cfdc33a988"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/sync-e6b355bcbe2a8223
[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" "9ca169f83d888eebedf1e07367e61707b27b203d83f481ee2318a1cfdc33a988"`
[INFO] running `"docker" "rm" "-f" "9ca169f83d888eebedf1e07367e61707b27b203d83f481ee2318a1cfdc33a988"`
[INFO] [stdout] 9ca169f83d888eebedf1e07367e61707b27b203d83f481ee2318a1cfdc33a988