[INFO] crate stream-combinators 0.1.0 is already in cache
[INFO] extracting crate stream-combinators 0.1.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/stream-combinators/0.1.0
[INFO] extracting crate stream-combinators 0.1.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/stream-combinators/0.1.0
[INFO] validating manifest of stream-combinators-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 stream-combinators-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 stream-combinators-0.1.0
[INFO] finished frobbing stream-combinators-0.1.0
[INFO] frobbed toml for stream-combinators-0.1.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/stream-combinators/0.1.0/Cargo.toml
[INFO] started frobbing stream-combinators-0.1.0
[INFO] finished frobbing stream-combinators-0.1.0
[INFO] frobbed toml for stream-combinators-0.1.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/stream-combinators/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 stream-combinators-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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/stream-combinators/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] 69ef0267b131bdf21f509df9624be4d09015bdeefa49d40c146d29c8439b04cb
[INFO] running `"docker" "start" "-a" "69ef0267b131bdf21f509df9624be4d09015bdeefa49d40c146d29c8439b04cb"`
[INFO] [stderr]    Compiling stream-combinators v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.43s
[INFO] running `"docker" "inspect" "69ef0267b131bdf21f509df9624be4d09015bdeefa49d40c146d29c8439b04cb"`
[INFO] running `"docker" "rm" "-f" "69ef0267b131bdf21f509df9624be4d09015bdeefa49d40c146d29c8439b04cb"`
[INFO] [stdout] 69ef0267b131bdf21f509df9624be4d09015bdeefa49d40c146d29c8439b04cb
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/stream-combinators/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] a5ffb161d4c5c49f5297db2de163ac5cacf3b6fd431ff00a368b96c81bfb34e5
[INFO] running `"docker" "start" "-a" "a5ffb161d4c5c49f5297db2de163ac5cacf3b6fd431ff00a368b96c81bfb34e5"`
[INFO] [stderr]    Compiling tokio-stdin v0.1.2
[INFO] [stderr]    Compiling stream-combinators v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]  --> examples/into_pairs.rs:9:41
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let number_stream = iter_ok::<_,()>((0..6));
[INFO] [stderr]   |                                         ^^^^^^ help: remove these parentheses
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.24s
[INFO] running `"docker" "inspect" "a5ffb161d4c5c49f5297db2de163ac5cacf3b6fd431ff00a368b96c81bfb34e5"`
[INFO] running `"docker" "rm" "-f" "a5ffb161d4c5c49f5297db2de163ac5cacf3b6fd431ff00a368b96c81bfb34e5"`
[INFO] [stdout] a5ffb161d4c5c49f5297db2de163ac5cacf3b6fd431ff00a368b96c81bfb34e5
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/stream-combinators/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] 2fe453f96d55a0556f72b19f010766bcd337ea783e708d33e68471ac9c036d59
[INFO] running `"docker" "start" "-a" "2fe453f96d55a0556f72b19f010766bcd337ea783e708d33e68471ac9c036d59"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.09s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/stream_combinators-8f59b08f46ff2016
[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] [stderr]    Doc-tests stream-combinators
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/filter_fold.rs - filter_fold::FilterFold (line 21) ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/filter_fold.rs - filter_fold::FilterFold (line 21) stdout ----
[INFO] [stdout] error[E0433]: failed to resolve: maybe a missing `extern crate futures;`?
[INFO] [stdout]  --> src/filter_fold.rs:22:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use futures::stream::{iter_ok, Stream};
[INFO] [stdout]   |     ^^^^^^^ maybe a missing `extern crate futures;`?
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `futures`
[INFO] [stdout]  --> src/filter_fold.rs:23:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use futures::Future;
[INFO] [stdout]   |     ^^^^^^^ maybe a missing `extern crate futures;`?
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `iter_ok` in this scope
[INFO] [stdout]  --> src/filter_fold.rs:26:21
[INFO] [stdout]   |
[INFO] [stdout] 8 | let number_stream = iter_ok::<_,()>((0..6));
[INFO] [stdout]   |                     ^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0425, E0432, E0433.
[INFO] [stdout] For more information about an error, try `rustc --explain E0425`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/filter_fold.rs - filter_fold::FilterFold (line 21)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] running `"docker" "inspect" "2fe453f96d55a0556f72b19f010766bcd337ea783e708d33e68471ac9c036d59"`
[INFO] running `"docker" "rm" "-f" "2fe453f96d55a0556f72b19f010766bcd337ea783e708d33e68471ac9c036d59"`
[INFO] [stdout] 2fe453f96d55a0556f72b19f010766bcd337ea783e708d33e68471ac9c036d59