[INFO] fetching crate stream-combinators 0.1.0...
[INFO] testing stream-combinators-0.1.0 against 1.49.0 for beta-1.50-1
[INFO] extracting crate stream-combinators 0.1.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate stream-combinators 0.1.0 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate stream-combinators 0.1.0
[INFO] finished tweaking crates.io crate stream-combinators 0.1.0
[INFO] tweaked toml for crates.io crate stream-combinators 0.1.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] eeaeb81d8fc2a969eae84aa7f754c775c7ff85cf8db45bcb31a3209797626e54
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "eeaeb81d8fc2a969eae84aa7f754c775c7ff85cf8db45bcb31a3209797626e54", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eeaeb81d8fc2a969eae84aa7f754c775c7ff85cf8db45bcb31a3209797626e54", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eeaeb81d8fc2a969eae84aa7f754c775c7ff85cf8db45bcb31a3209797626e54", kill_on_drop: false }`
[INFO] [stdout] eeaeb81d8fc2a969eae84aa7f754c775c7ff85cf8db45bcb31a3209797626e54
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a2312c45e584a0f9fb739d8fbcc36fbe515097f1deca8e9529434b4a69db1578
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "a2312c45e584a0f9fb739d8fbcc36fbe515097f1deca8e9529434b4a69db1578", kill_on_drop: false }`
[INFO] [stderr]    Compiling stream-combinators v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.44s
[INFO] running `Command { std: "docker" "inspect" "a2312c45e584a0f9fb739d8fbcc36fbe515097f1deca8e9529434b4a69db1578", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a2312c45e584a0f9fb739d8fbcc36fbe515097f1deca8e9529434b4a69db1578", kill_on_drop: false }`
[INFO] [stdout] a2312c45e584a0f9fb739d8fbcc36fbe515097f1deca8e9529434b4a69db1578
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 115bfee9c5b852b4a3f3c0e0cce197d108741a4fe8391e8a6fc40d211437daf8
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "115bfee9c5b852b4a3f3c0e0cce197d108741a4fe8391e8a6fc40d211437daf8", kill_on_drop: false }`
[INFO] [stderr]    Compiling tokio-stdin v0.1.2
[INFO] [stderr]    Compiling mio-uds v0.6.8
[INFO] [stderr]    Compiling tokio-fs v0.1.7
[INFO] [stderr]    Compiling tokio-udp v0.1.6
[INFO] [stderr]    Compiling tokio-uds v0.2.7
[INFO] [stderr]    Compiling tokio v0.1.22
[INFO] [stderr]    Compiling tokio-core v0.1.18
[INFO] [stderr]    Compiling stream-combinators v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]  --> examples/into_pairs.rs:9:41
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let number_stream = iter_ok::<_,()>((0..6));
[INFO] [stdout]   |                                         ^^^^^^ help: remove these parentheses
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 9.06s
[INFO] running `Command { std: "docker" "inspect" "115bfee9c5b852b4a3f3c0e0cce197d108741a4fe8391e8a6fc40d211437daf8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "115bfee9c5b852b4a3f3c0e0cce197d108741a4fe8391e8a6fc40d211437daf8", kill_on_drop: false }`
[INFO] [stdout] 115bfee9c5b852b4a3f3c0e0cce197d108741a4fe8391e8a6fc40d211437daf8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 070c52cd73e83923ea53259187ca23584a75f202cbf3d37f0c9b2fcbfcc6c1f0
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "070c52cd73e83923ea53259187ca23584a75f202cbf3d37f0c9b2fcbfcc6c1f0", kill_on_drop: false }`
[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] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.09s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/stream_combinators-cd4f9243f834d1bb
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests stream-combinators
[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 1 test
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[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 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 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 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] running `Command { std: "docker" "inspect" "070c52cd73e83923ea53259187ca23584a75f202cbf3d37f0c9b2fcbfcc6c1f0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "070c52cd73e83923ea53259187ca23584a75f202cbf3d37f0c9b2fcbfcc6c1f0", kill_on_drop: false }`
[INFO] [stdout] 070c52cd73e83923ea53259187ca23584a75f202cbf3d37f0c9b2fcbfcc6c1f0