[INFO] updating cached repository https://github.com/yuu/rust-future-example
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c5704fd681f1180c6d45ceaf720eccd7d1e0247b
[INFO] testing yuu/rust-future-example against master#8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e for pr-74409
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyuu%2Frust-future-example" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/yuu/rust-future-example on toolchain 8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/yuu/rust-future-example
[INFO] finished tweaking git repo https://github.com/yuu/rust-future-example
[INFO] tweaked toml for git repo https://github.com/yuu/rust-future-example written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/yuu/rust-future-example already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d480571d39dcfb2d2030da71eb49f8291f994e36d803867fceac0506436a69bb
[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" "d480571d39dcfb2d2030da71eb49f8291f994e36d803867fceac0506436a69bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d480571d39dcfb2d2030da71eb49f8291f994e36d803867fceac0506436a69bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d480571d39dcfb2d2030da71eb49f8291f994e36d803867fceac0506436a69bb", kill_on_drop: false }`
[INFO] [stdout] d480571d39dcfb2d2030da71eb49f8291f994e36d803867fceac0506436a69bb
[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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 56058b268bd649f3872f9a6c650b386c85185ceca15f552a38ad5b3b98cada22
[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" "56058b268bd649f3872f9a6c650b386c85185ceca15f552a38ad5b3b98cada22", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]    Compiling log v0.4.7
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling async-util v0.1.0 (https://github.com/tokio-rs/async#e1b3ba3d)
[INFO] [stderr]    Compiling smallvec v0.6.10
[INFO] [stderr]    Compiling fnv v1.0.6
[INFO] [stderr]    Compiling scopeguard v0.3.3
[INFO] [stderr]    Compiling memoffset v0.2.1
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling syn v0.15.40
[INFO] [stderr]    Compiling arc-waker v0.1.0 (https://github.com/tokio-rs/async#e1b3ba3d)
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling crossbeam-utils v0.6.5
[INFO] [stderr]    Compiling crossbeam-utils v0.6.5 (https://github.com/stjepang/crossbeam?branch=raw-parker#e2a7760f)
[INFO] [stderr]    Compiling tracing-core v0.1.2
[INFO] [stderr]    Compiling lock_api v0.3.1
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling futures-sink-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling tokio-sync v0.2.0 (https://github.com/tokio-rs/tokio#e88d10a3)
[INFO] [stderr]    Compiling crossbeam-epoch v0.7.1
[INFO] [stderr]    Compiling crossbeam-queue v0.1.2
[INFO] [stderr]    Compiling crossbeam-channel v0.3.8
[INFO] [stderr]    Compiling tokio-executor v0.2.0 (https://github.com/tokio-rs/tokio#e88d10a3)
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling crossbeam-deque v0.7.1
[INFO] [stderr]    Compiling tokio-timer v0.3.0 (https://github.com/tokio-rs/tokio#e88d10a3)
[INFO] [stderr]    Compiling parking_lot_core v0.6.1
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[INFO] [stderr]    Compiling iovec v0.1.2
[INFO] [stderr]    Compiling num_cpus v1.10.1
[INFO] [stderr]    Compiling net2 v0.2.33
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling tokio-current-thread v0.2.0 (https://github.com/tokio-rs/tokio#e88d10a3)
[INFO] [stderr]    Compiling tokio-threadpool v0.2.0 (https://github.com/tokio-rs/tokio#e88d10a3)
[INFO] [stderr]    Compiling mio v0.6.19
[INFO] [stderr]    Compiling tokio-io v0.2.0 (https://github.com/tokio-rs/tokio#e88d10a3)
[INFO] [stderr]    Compiling tokio-codec v0.2.0 (https://github.com/tokio-rs/tokio#e88d10a3)
[INFO] [stderr]    Compiling tokio-fs v0.2.0 (https://github.com/tokio-rs/tokio#e88d10a3)
[INFO] [stderr]    Compiling tokio-reactor v0.2.0 (https://github.com/tokio-rs/tokio#e88d10a3)
[INFO] [stderr]    Compiling mio-uds v0.6.7
[INFO] [stderr]    Compiling tokio-udp v0.2.0 (https://github.com/tokio-rs/tokio#e88d10a3)
[INFO] [stderr]    Compiling tokio-uds v0.3.0 (https://github.com/tokio-rs/tokio#e88d10a3)
[INFO] [stderr]    Compiling tokio-tcp v0.2.0 (https://github.com/tokio-rs/tokio#e88d10a3)
[INFO] [stderr]    Compiling tokio-macros v0.2.0 (https://github.com/tokio-rs/tokio#e88d10a3)
[INFO] [stderr]    Compiling tokio v0.2.0 (https://github.com/tokio-rs/tokio#e88d10a3)
[INFO] [stderr]    Compiling future-example v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `AsyncWriteExt`
[INFO] [stdout]  --> src/main.rs:4:31
[INFO] [stdout]   |
[INFO] [stdout] 4 | use tokio::io::{AsyncReadExt, AsyncWriteExt};
[INFO] [stdout]   |                               ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `async_await` has been stable since 1.39.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(async_await)]
[INFO] [stdout]   |            ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]  --> src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     stream.read_exact(&mut buf).await;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 51.23s
[INFO] running `Command { std: "docker" "inspect" "56058b268bd649f3872f9a6c650b386c85185ceca15f552a38ad5b3b98cada22", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "56058b268bd649f3872f9a6c650b386c85185ceca15f552a38ad5b3b98cada22", kill_on_drop: false }`
[INFO] [stdout] 56058b268bd649f3872f9a6c650b386c85185ceca15f552a38ad5b3b98cada22
[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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4dd1148ad053692d365e93d601411554c4453dfdf1e0bdb475bf6dcde7a6d1f7
[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" "4dd1148ad053692d365e93d601411554c4453dfdf1e0bdb475bf6dcde7a6d1f7", kill_on_drop: false }`
[INFO] [stderr]    Compiling future-example v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `AsyncWriteExt`
[INFO] [stdout]  --> src/main.rs:4:31
[INFO] [stdout]   |
[INFO] [stdout] 4 | use tokio::io::{AsyncReadExt, AsyncWriteExt};
[INFO] [stdout]   |                               ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `async_await` has been stable since 1.39.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(async_await)]
[INFO] [stdout]   |            ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]  --> src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     stream.read_exact(&mut buf).await;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.86s
[INFO] running `Command { std: "docker" "inspect" "4dd1148ad053692d365e93d601411554c4453dfdf1e0bdb475bf6dcde7a6d1f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4dd1148ad053692d365e93d601411554c4453dfdf1e0bdb475bf6dcde7a6d1f7", kill_on_drop: false }`
[INFO] [stdout] 4dd1148ad053692d365e93d601411554c4453dfdf1e0bdb475bf6dcde7a6d1f7
[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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] ae3b4b634fb77f5ff69d25d599a11e41b946407d6b9339463f43ddeefc3aa5ab
[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" "ae3b4b634fb77f5ff69d25d599a11e41b946407d6b9339463f43ddeefc3aa5ab", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `AsyncWriteExt`
[INFO] [stderr]  --> src/main.rs:4:31
[INFO] [stderr]   |
[INFO] [stderr] 4 | use tokio::io::{AsyncReadExt, AsyncWriteExt};
[INFO] [stderr]   |                               ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `async_await` has been stable since 1.39.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(async_await)]
[INFO] [stderr]   |            ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(stable_features)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]  --> src/main.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     stream.read_exact(&mut buf).await;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.16s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/future_example-2799dbef5cc98635
[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 `Command { std: "docker" "inspect" "ae3b4b634fb77f5ff69d25d599a11e41b946407d6b9339463f43ddeefc3aa5ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ae3b4b634fb77f5ff69d25d599a11e41b946407d6b9339463f43ddeefc3aa5ab", kill_on_drop: false }`
[INFO] [stdout] ae3b4b634fb77f5ff69d25d599a11e41b946407d6b9339463f43ddeefc3aa5ab