[INFO] updating cached repository olegnik92/doubles_search
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/olegnik92/doubles_search
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/olegnik92/doubles_search" "work/ex/beta-1.38-1/sources/1.37.0/gh/olegnik92/doubles_search"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/olegnik92/doubles_search'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/olegnik92/doubles_search" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/olegnik92/doubles_search"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/olegnik92/doubles_search'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8de7cc85103cd5eb32bee193addc4d17c505968e
[INFO] sha for GitHub repo olegnik92/doubles_search: 8de7cc85103cd5eb32bee193addc4d17c505968e
[INFO] validating manifest of olegnik92/doubles_search 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 olegnik92/doubles_search 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 olegnik92/doubles_search
[INFO] finished frobbing olegnik92/doubles_search
[INFO] frobbed toml for olegnik92/doubles_search written to work/ex/beta-1.38-1/sources/1.37.0/gh/olegnik92/doubles_search/Cargo.toml
[INFO] started frobbing olegnik92/doubles_search
[INFO] finished frobbing olegnik92/doubles_search
[INFO] frobbed toml for olegnik92/doubles_search written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/olegnik92/doubles_search/Cargo.toml
[INFO] crate olegnik92/doubles_search 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 olegnik92/doubles_search 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/olegnik92/doubles_search:/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] 4eb4bdfa93c866f7a1d987f71fd8416223cd9fb4a286db10a48d3c3106eefbfc
[INFO] running `"docker" "start" "-a" "4eb4bdfa93c866f7a1d987f71fd8416223cd9fb4a286db10a48d3c3106eefbfc"`
[INFO] [stderr]    Compiling doubles_search v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:46:21
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 let mut names = e.get_mut();
[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 1.51s
[INFO] running `"docker" "inspect" "4eb4bdfa93c866f7a1d987f71fd8416223cd9fb4a286db10a48d3c3106eefbfc"`
[INFO] running `"docker" "rm" "-f" "4eb4bdfa93c866f7a1d987f71fd8416223cd9fb4a286db10a48d3c3106eefbfc"`
[INFO] [stdout] 4eb4bdfa93c866f7a1d987f71fd8416223cd9fb4a286db10a48d3c3106eefbfc
[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/olegnik92/doubles_search:/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] 2c0d841839924245990f31fb99f0b351396a422c9f3b5a4bf5586c721cef1f84
[INFO] running `"docker" "start" "-a" "2c0d841839924245990f31fb99f0b351396a422c9f3b5a4bf5586c721cef1f84"`
[INFO] [stderr]    Compiling doubles_search v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:46:21
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 let mut names = e.get_mut();
[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 0.90s
[INFO] running `"docker" "inspect" "2c0d841839924245990f31fb99f0b351396a422c9f3b5a4bf5586c721cef1f84"`
[INFO] running `"docker" "rm" "-f" "2c0d841839924245990f31fb99f0b351396a422c9f3b5a4bf5586c721cef1f84"`
[INFO] [stdout] 2c0d841839924245990f31fb99f0b351396a422c9f3b5a4bf5586c721cef1f84
[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/olegnik92/doubles_search:/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] 3373b0eef0f4032221fd9759d5c66a0e139c0ef1e1c4db9f4a2eb9aa99327838
[INFO] running `"docker" "start" "-a" "3373b0eef0f4032221fd9759d5c66a0e139c0ef1e1c4db9f4a2eb9aa99327838"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/doubles_search-d4d58266363e7202
[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" "3373b0eef0f4032221fd9759d5c66a0e139c0ef1e1c4db9f4a2eb9aa99327838"`
[INFO] running `"docker" "rm" "-f" "3373b0eef0f4032221fd9759d5c66a0e139c0ef1e1c4db9f4a2eb9aa99327838"`
[INFO] [stdout] 3373b0eef0f4032221fd9759d5c66a0e139c0ef1e1c4db9f4a2eb9aa99327838