[INFO] fetching crate cb_fut 0.2.1...
[INFO] testing cb_fut-0.2.1 against 1.49.0 for beta-1.50-1
[INFO] extracting crate cb_fut 0.2.1 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate cb_fut 0.2.1 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 cb_fut 0.2.1
[INFO] finished tweaking crates.io crate cb_fut 0.2.1
[INFO] tweaked toml for crates.io crate cb_fut 0.2.1 written to /workspace/builds/worker-5/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6f2a82da100f3b1bb2270f4ee72d6ba74d49f52da20aadfe3c523e1c41121dfc
[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" "6f2a82da100f3b1bb2270f4ee72d6ba74d49f52da20aadfe3c523e1c41121dfc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6f2a82da100f3b1bb2270f4ee72d6ba74d49f52da20aadfe3c523e1c41121dfc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6f2a82da100f3b1bb2270f4ee72d6ba74d49f52da20aadfe3c523e1c41121dfc", kill_on_drop: false }`
[INFO] [stdout] 6f2a82da100f3b1bb2270f4ee72d6ba74d49f52da20aadfe3c523e1c41121dfc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e617a797675bcc66ac750120ba3fcaf912c460ccdee11089456e7912443bccf6
[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" "e617a797675bcc66ac750120ba3fcaf912c460ccdee11089456e7912443bccf6", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling once_cell v1.5.2
[INFO] [stderr]    Compiling pin-project-internal v1.0.2
[INFO] [stderr]    Compiling futures-macro v0.3.8
[INFO] [stderr]    Compiling futures-task v0.3.8
[INFO] [stderr]    Compiling pin-project v1.0.2
[INFO] [stderr]    Compiling futures-util v0.3.8
[INFO] [stderr]    Compiling futures-executor v0.3.8
[INFO] [stderr]    Compiling futures v0.3.8
[INFO] [stderr]    Compiling cb_fut v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 18.21s
[INFO] running `Command { std: "docker" "inspect" "e617a797675bcc66ac750120ba3fcaf912c460ccdee11089456e7912443bccf6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e617a797675bcc66ac750120ba3fcaf912c460ccdee11089456e7912443bccf6", kill_on_drop: false }`
[INFO] [stdout] e617a797675bcc66ac750120ba3fcaf912c460ccdee11089456e7912443bccf6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 950ed9ae22046d3e2756dbc6bba4106ace11b9cf8a8c9e48c1b8ec202097b349
[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" "950ed9ae22046d3e2756dbc6bba4106ace11b9cf8a8c9e48c1b8ec202097b349", kill_on_drop: false }`
[INFO] [stderr]    Compiling cb_fut v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary braces around method argument
[INFO] [stdout]    --> src/lib.rs:666:71
[INFO] [stdout]     |
[INFO] [stdout] 666 |         futures::executor::block_on(once_blocked!(func(2 + 3, ->() -> {3i32})));
[INFO] [stdout]     |                                                                       ^^^^^^ help: remove these braces
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around method argument
[INFO] [stdout]    --> src/lib.rs:728:64
[INFO] [stdout]     |
[INFO] [stdout] 728 |         futures::executor::block_on(once_blocked!(func(->() -> {3i32}, 2 + 3)));
[INFO] [stdout]     |                                                                ^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.99s
[INFO] running `Command { std: "docker" "inspect" "950ed9ae22046d3e2756dbc6bba4106ace11b9cf8a8c9e48c1b8ec202097b349", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "950ed9ae22046d3e2756dbc6bba4106ace11b9cf8a8c9e48c1b8ec202097b349", kill_on_drop: false }`
[INFO] [stdout] 950ed9ae22046d3e2756dbc6bba4106ace11b9cf8a8c9e48c1b8ec202097b349
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] a3d8b86804ea5becec629291c309bf0f1499064b790fe3d6e648e5e0f3e3bd7a
[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" "a3d8b86804ea5becec629291c309bf0f1499064b790fe3d6e648e5e0f3e3bd7a", kill_on_drop: false }`
[INFO] [stderr] warning: unnecessary braces around method argument
[INFO] [stderr]    --> src/lib.rs:666:71
[INFO] [stderr]     |
[INFO] [stderr] 666 |         futures::executor::block_on(once_blocked!(func(2 + 3, ->() -> {3i32})));
[INFO] [stderr]     |                                                                       ^^^^^^ help: remove these braces
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_braces)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary braces around method argument
[INFO] [stderr]    --> src/lib.rs:728:64
[INFO] [stderr]     |
[INFO] [stderr] 728 |         futures::executor::block_on(once_blocked!(func(->() -> {3i32}, 2 + 3)));
[INFO] [stderr]     |                                                                ^^^^^^ help: remove these braces
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/cb_fut-bb3d423d3e39e91e
[INFO] [stdout] 
[INFO] [stdout] running 21 tests
[INFO] [stdout] test tests::test_once_blocked_default_infix ... ok
[INFO] [stdout] test tests::test_once_blocked_default_prefix ... ok
[INFO] [stdout] test tests::test_once_blocked_default_prefix_no_args ... ok
[INFO] [stdout] test tests::test_once_blocked_infix ... ok
[INFO] [stdout] test tests::test_once_blocked_postfix ... ok
[INFO] [stdout] test tests::test_once_blocked_postfix_with_logic ... ok
[INFO] [stdout] test tests::test_once_blocked_prefix ... ok
[INFO] [stdout] test tests::test_stream_infix ... ok
[INFO] [stdout] test tests::test_stream_postfix ... ok
[INFO] [stdout] test tests::test_stream_prefix ... ok
[INFO] [stdout] test tests::test_stream_blocked_postfix ... ok
[INFO] [stdout] test tests::test_stream_blocked_prefix ... ok
[INFO] [stdout] test tests::test_stream_prefix_no_args ... ok
[INFO] [stdout] test tests::test_once_blocked_default_postfix_no_args ... ok
[INFO] [stdout] test tests::test_stream_blocked_infix ... ok
[INFO] [stdout] test tests::test_once_blocked_default_postfix ... ok
[INFO] [stdout] test tests::test_once_blocked_default_infix_no_args ... ok
[INFO] [stderr]    Doc-tests cb_fut
[INFO] [stdout] test tests::test_once_infix ... ok
[INFO] [stdout] test tests::test_once_prefix ... ok
[INFO] [stdout] test tests::test_once_postfix ... ok
[INFO] [stdout] test tests::test_once_postfix_no_args ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 21 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 5 tests
[INFO] [stdout] test src/lib.rs - stream (line 250) ... ok
[INFO] [stdout] test src/lib.rs - stream_blocked (line 318) ... ok
[INFO] [stdout] test src/lib.rs - once (line 65) ... ok
[INFO] [stdout] test src/lib.rs - once_blocked (line 132) ... ok
[INFO] [stdout] test src/lib.rs - once_blocked (line 147) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "a3d8b86804ea5becec629291c309bf0f1499064b790fe3d6e648e5e0f3e3bd7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a3d8b86804ea5becec629291c309bf0f1499064b790fe3d6e648e5e0f3e3bd7a", kill_on_drop: false }`
[INFO] [stdout] a3d8b86804ea5becec629291c309bf0f1499064b790fe3d6e648e5e0f3e3bd7a