[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-1.38-1/sources/1.37.0/gh/demostf/sync-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/demostf/sync-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/demostf/sync-rs" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/demostf/sync-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/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 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of demostf/sync-rs 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 demostf/sync-rs
[INFO] finished frobbing demostf/sync-rs
[INFO] frobbed toml for demostf/sync-rs written to work/ex/beta-1.38-1/sources/1.37.0/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-1.38-1/sources/beta-2019-08-13/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" "+1.37.0" "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 demostf/sync-rs 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-4/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/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-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 5abc1312cb3f4161414a8c07a9ae424c2d304893dcd8a961f571c33897cac74e
[INFO] running `"docker" "start" "-a" "5abc1312cb3f4161414a8c07a9ae424c2d304893dcd8a961f571c33897cac74e"`
[INFO] [stderr]    Compiling serde v1.0.15
[INFO] [stderr]    Compiling serde_derive_internals v0.16.0
[INFO] [stderr]    Compiling mio v0.6.10
[INFO] [stderr]    Compiling serde_derive v1.0.15
[INFO] [stderr]    Compiling ws v0.7.3
[INFO] [stderr]    Compiling serde_json v1.0.3
[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 28.72s
[INFO] running `"docker" "inspect" "5abc1312cb3f4161414a8c07a9ae424c2d304893dcd8a961f571c33897cac74e"`
[INFO] running `"docker" "rm" "-f" "5abc1312cb3f4161414a8c07a9ae424c2d304893dcd8a961f571c33897cac74e"`
[INFO] [stdout] 5abc1312cb3f4161414a8c07a9ae424c2d304893dcd8a961f571c33897cac74e
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/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/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-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 7f5d35e0887d9a24ad6ee228a7c7695f0e7f71bb8ca3c53f5e2eb8226d1aa1be
[INFO] running `"docker" "start" "-a" "7f5d35e0887d9a24ad6ee228a7c7695f0e7f71bb8ca3c53f5e2eb8226d1aa1be"`
[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 1.03s
[INFO] running `"docker" "inspect" "7f5d35e0887d9a24ad6ee228a7c7695f0e7f71bb8ca3c53f5e2eb8226d1aa1be"`
[INFO] running `"docker" "rm" "-f" "7f5d35e0887d9a24ad6ee228a7c7695f0e7f71bb8ca3c53f5e2eb8226d1aa1be"`
[INFO] [stdout] 7f5d35e0887d9a24ad6ee228a7c7695f0e7f71bb8ca3c53f5e2eb8226d1aa1be
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/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/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-2019-08-13" "test" "--frozen"`
[INFO] [stdout] fae4dfc837a12e1e163c906e14dbe97d6e538fb1a08829b0a420b4eee459cb86
[INFO] running `"docker" "start" "-a" "fae4dfc837a12e1e163c906e14dbe97d6e538fb1a08829b0a420b4eee459cb86"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/sync-43202fc10df7e637
[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" "fae4dfc837a12e1e163c906e14dbe97d6e538fb1a08829b0a420b4eee459cb86"`
[INFO] running `"docker" "rm" "-f" "fae4dfc837a12e1e163c906e14dbe97d6e538fb1a08829b0a420b4eee459cb86"`
[INFO] [stdout] fae4dfc837a12e1e163c906e14dbe97d6e538fb1a08829b0a420b4eee459cb86