[INFO] fetching crate want 0.3.1...
[INFO] checking want-0.3.1 against try#c659ee110de67e82444e4b6c8407c1a9af9c2cf6 for pr-145608-1
[INFO] extracting crate want 0.3.1 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate want 0.3.1
[INFO] finished tweaking crates.io crate want 0.3.1
[INFO] tweaked toml for crates.io crate want 0.3.1 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate want 0.3.1 on toolchain c659ee110de67e82444e4b6c8407c1a9af9c2cf6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 9 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e7d1cd8ffa3a3407f9f3053d13cc6b59896458455a782b058dbe75394650c47b
[INFO] running `Command { std: "docker" "start" "-a" "e7d1cd8ffa3a3407f9f3053d13cc6b59896458455a782b058dbe75394650c47b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e7d1cd8ffa3a3407f9f3053d13cc6b59896458455a782b058dbe75394650c47b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e7d1cd8ffa3a3407f9f3053d13cc6b59896458455a782b058dbe75394650c47b", kill_on_drop: false }`
[INFO] [stdout] e7d1cd8ffa3a3407f9f3053d13cc6b59896458455a782b058dbe75394650c47b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e377fe1a7ed61ddbde2dc984684553c14309271a5f5060dbaffcb3c4419ca142
[INFO] running `Command { std: "docker" "start" "-a" "e377fe1a7ed61ddbde2dc984684553c14309271a5f5060dbaffcb3c4419ca142", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking want v0.3.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking futures-channel-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking tokio-sync v0.2.0-alpha.6
[INFO] [stderr]     Checking tokio-executor v0.2.0-alpha.6
[INFO] [stdout] error[E0061]: this method takes 1 argument but 0 arguments were supplied
[INFO] [stdout]    --> benches/throughput.rs:12:20
[INFO] [stdout]     |
[INFO] [stdout]  12 |         assert!(gv.poll_want().unwrap().is_ready());
[INFO] [stdout]     |                    ^^^^^^^^^-- argument #1 of type `&mut Context<'_>` is missing
[INFO] [stdout]     |
[INFO] [stdout] note: method defined here
[INFO] [stdout]    --> /opt/rustwide/workdir/src/lib.rs:192:12
[INFO] [stdout]     |
[INFO] [stdout] 192 |     pub fn poll_want(&mut self, cx: &mut task::Context<'_>) -> Poll<Result<(), Closed>> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] help: provide the argument
[INFO] [stdout]     |
[INFO] [stdout]  12 |         assert!(gv.poll_want(/* &mut Context<'_> */).unwrap().is_ready());
[INFO] [stdout]     |                              ++++++++++++++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `unwrap` found for enum `Poll<T>` in the current scope
[INFO] [stdout]   --> benches/throughput.rs:12:32
[INFO] [stdout]    |
[INFO] [stdout] 12 |         assert!(gv.poll_want().unwrap().is_ready());
[INFO] [stdout]    |                                ^^^^^^ method not found in `Poll<Result<(), Closed>>`
[INFO] [stdout]    |
[INFO] [stdout] note: the method `unwrap` exists on the type `Result<(), Closed>`
[INFO] [stdout]   --> /rustc/c659ee110de67e82444e4b6c8407c1a9af9c2cf6/library/core/src/result.rs:1217:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0061, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0061`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `want` (bench "throughput") due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "e377fe1a7ed61ddbde2dc984684553c14309271a5f5060dbaffcb3c4419ca142", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e377fe1a7ed61ddbde2dc984684553c14309271a5f5060dbaffcb3c4419ca142", kill_on_drop: false }`
[INFO] [stdout] e377fe1a7ed61ddbde2dc984684553c14309271a5f5060dbaffcb3c4419ca142