[INFO] crate backoff 0.1.5 is already in cache
[INFO] extracting crate backoff 0.1.5 into work/ex/beta-1.37-6/sources/1.36.0/reg/backoff/0.1.5
[INFO] extracting crate backoff 0.1.5 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/backoff/0.1.5
[INFO] validating manifest of backoff-0.1.5 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 backoff-0.1.5 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 backoff-0.1.5
[INFO] finished frobbing backoff-0.1.5
[INFO] frobbed toml for backoff-0.1.5 written to work/ex/beta-1.37-6/sources/1.36.0/reg/backoff/0.1.5/Cargo.toml
[INFO] started frobbing backoff-0.1.5
[INFO] finished frobbing backoff-0.1.5
[INFO] frobbed toml for backoff-0.1.5 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/backoff/0.1.5/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 backoff-0.1.5 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/backoff/0.1.5:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] b7a93c8954ff677f373bd6f0bf246cceeb0b885c88611f25c958aa94dad271d6
[INFO] running `"docker" "start" "-a" "b7a93c8954ff677f373bd6f0bf246cceeb0b885c88611f25c958aa94dad271d6"`
[INFO] [stderr]    Compiling backoff v0.1.5 (/opt/crater/workdir)
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
[INFO] [stderr]   --> src/error.rs:54:46
[INFO] [stderr]    |
[INFO] [stderr] 54 |             Error::Transient(ref err) => err.cause(),
[INFO] [stderr]    |                                              ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(deprecated)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.62s
[INFO] running `"docker" "inspect" "b7a93c8954ff677f373bd6f0bf246cceeb0b885c88611f25c958aa94dad271d6"`
[INFO] running `"docker" "rm" "-f" "b7a93c8954ff677f373bd6f0bf246cceeb0b885c88611f25c958aa94dad271d6"`
[INFO] [stdout] b7a93c8954ff677f373bd6f0bf246cceeb0b885c88611f25c958aa94dad271d6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/backoff/0.1.5:/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] f6ddbd6d899a4028a70f78efef34c0d77b0cdad9464b424b1a61e242e1caec06
[INFO] running `"docker" "start" "-a" "f6ddbd6d899a4028a70f78efef34c0d77b0cdad9464b424b1a61e242e1caec06"`
[INFO] [stderr]    Compiling backoff v0.1.5 (/opt/crater/workdir)
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
[INFO] [stderr]   --> src/error.rs:54:46
[INFO] [stderr]    |
[INFO] [stderr] 54 |             Error::Transient(ref err) => err.cause(),
[INFO] [stderr]    |                                              ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(deprecated)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.44s
[INFO] running `"docker" "inspect" "f6ddbd6d899a4028a70f78efef34c0d77b0cdad9464b424b1a61e242e1caec06"`
[INFO] running `"docker" "rm" "-f" "f6ddbd6d899a4028a70f78efef34c0d77b0cdad9464b424b1a61e242e1caec06"`
[INFO] [stdout] f6ddbd6d899a4028a70f78efef34c0d77b0cdad9464b424b1a61e242e1caec06
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/backoff/0.1.5:/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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] d72283cf38eaa0da787bfe4523d5ce8abcc64a055a1feab8cac1060407dae4be
[INFO] running `"docker" "start" "-a" "d72283cf38eaa0da787bfe4523d5ce8abcc64a055a1feab8cac1060407dae4be"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.19s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/backoff-1431611463be6720
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test exponential::get_randomized_interval ... ok
[INFO] [stderr]      Running /opt/crater/target/debug/deps/exponential-3f00615a1c6c76eb
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test get_elapsed_time ... ok
[INFO] [stdout] test max_elapsed_time ... ok
[INFO] [stdout] test backoff ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/retry-9936539a7402a074
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test permanent_error_immediately_returned ... ok
[INFO] [stdout] test retry ... ok
[INFO] [stderr]    Doc-tests backoff
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test src/lib.rs -  (line 19) ... ignored
[INFO] [stdout] test src/lib.rs -  (line 9) ... ignored
[INFO] [stdout] test src/retry.rs - retry::Operation::retry_notify (line 47) ... ok
[INFO] [stdout] test src/retry.rs - retry::Operation::retry (line 23) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 2 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "d72283cf38eaa0da787bfe4523d5ce8abcc64a055a1feab8cac1060407dae4be"`
[INFO] running `"docker" "rm" "-f" "d72283cf38eaa0da787bfe4523d5ce8abcc64a055a1feab8cac1060407dae4be"`
[INFO] [stdout] d72283cf38eaa0da787bfe4523d5ce8abcc64a055a1feab8cac1060407dae4be