[INFO] crate tower-test 0.1.0 is already in cache
[INFO] extracting crate tower-test 0.1.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/tower-test/0.1.0
[INFO] extracting crate tower-test 0.1.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/tower-test/0.1.0
[INFO] validating manifest of tower-test-0.1.0 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 tower-test-0.1.0 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 tower-test-0.1.0
[INFO] finished frobbing tower-test-0.1.0
[INFO] frobbed toml for tower-test-0.1.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/tower-test/0.1.0/Cargo.toml
[INFO] started frobbing tower-test-0.1.0
[INFO] finished frobbing tower-test-0.1.0
[INFO] frobbed toml for tower-test-0.1.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/tower-test/0.1.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 tower-test-0.1.0 against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/tower-test/0.1.0:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] bf0d398d9d506f6f1612b7bbaa9a2782c8d10a2db8b38d94cb93164ee2e3aab9
[INFO] running `"docker" "start" "-a" "bf0d398d9d506f6f1612b7bbaa9a2782c8d10a2db8b38d94cb93164ee2e3aab9"`
[INFO] [stderr]    Compiling tower-service v0.2.0
[INFO] [stderr]    Compiling tower-test v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.90s
[INFO] running `"docker" "inspect" "bf0d398d9d506f6f1612b7bbaa9a2782c8d10a2db8b38d94cb93164ee2e3aab9"`
[INFO] running `"docker" "rm" "-f" "bf0d398d9d506f6f1612b7bbaa9a2782c8d10a2db8b38d94cb93164ee2e3aab9"`
[INFO] [stdout] bf0d398d9d506f6f1612b7bbaa9a2782c8d10a2db8b38d94cb93164ee2e3aab9
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/tower-test/0.1.0:/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] dfa597d6a562d6d05a17c6ddf2586ba6d9772c918da4597f9a51a8e040980ae9
[INFO] running `"docker" "start" "-a" "dfa597d6a562d6d05a17c6ddf2586ba6d9772c918da4597f9a51a8e040980ae9"`
[INFO] [stderr]    Compiling proc-macro2 v1.0.1
[INFO] [stderr]    Compiling syn v1.0.3
[INFO] [stderr]    Compiling lazy_static v1.3.0
[INFO] [stderr]    Compiling tower-layer v0.1.0
[INFO] [stderr]    Compiling tower-discover v0.1.0
[INFO] [stderr]    Compiling tower-util v0.1.0
[INFO] [stderr]    Compiling tower-load-shed v0.1.0
[INFO] [stderr]    Compiling crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling tracing-core v0.1.5
[INFO] [stderr]    Compiling tokio-executor v0.1.8
[INFO] [stderr]    Compiling tokio-timer v0.2.11
[INFO] [stderr]    Compiling tower-retry v0.1.0
[INFO] [stderr]    Compiling tower-limit v0.1.0
[INFO] [stderr]    Compiling tower-timeout v0.1.1
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]    Compiling tracing-attributes v0.1.2
[INFO] [stderr]    Compiling tracing v0.1.6
[INFO] [stderr]    Compiling tower-buffer v0.1.1
[INFO] [stderr]    Compiling tower v0.1.1
[INFO] [stderr]    Compiling tower-test v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: the item `Future` is imported redundantly
[INFO] [stderr]   --> tests/mock.rs:57:33
[INFO] [stderr]    |
[INFO] [stderr] 1  | use futures::Future;
[INFO] [stderr]    |     --------------- the item `Future` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 57 |     use futures::future::{lazy, Future};
[INFO] [stderr]    |                                 ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 23.22s
[INFO] running `"docker" "inspect" "dfa597d6a562d6d05a17c6ddf2586ba6d9772c918da4597f9a51a8e040980ae9"`
[INFO] running `"docker" "rm" "-f" "dfa597d6a562d6d05a17c6ddf2586ba6d9772c918da4597f9a51a8e040980ae9"`
[INFO] [stdout] dfa597d6a562d6d05a17c6ddf2586ba6d9772c918da4597f9a51a8e040980ae9
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/tower-test/0.1.0:/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] cfbaaea125f84471ba7bb3ddf7ebe4be2b335a9dbf05e63fa041246e23ff8b3d
[INFO] running `"docker" "start" "-a" "cfbaaea125f84471ba7bb3ddf7ebe4be2b335a9dbf05e63fa041246e23ff8b3d"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/tower_test-887bffe667503078
[INFO] [stderr]      Running /opt/crater/target/debug/deps/mock-508c055e87fae11d
[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] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test single_request_ready ... ok
[INFO] [stdout] test backpressure ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests tower-test
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/macros.rs - assert_request_eq (line 9) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "cfbaaea125f84471ba7bb3ddf7ebe4be2b335a9dbf05e63fa041246e23ff8b3d"`
[INFO] running `"docker" "rm" "-f" "cfbaaea125f84471ba7bb3ddf7ebe4be2b335a9dbf05e63fa041246e23ff8b3d"`
[INFO] [stdout] cfbaaea125f84471ba7bb3ddf7ebe4be2b335a9dbf05e63fa041246e23ff8b3d