[INFO] fetching crate ruo 0.1.2...
[INFO] checking ruo-0.1.2 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate ruo 0.1.2 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate ruo 0.1.2 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ruo 0.1.2
[INFO] finished tweaking crates.io crate ruo 0.1.2
[INFO] tweaked toml for crates.io crate ruo 0.1.2 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate crates.io crate ruo 0.1.2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tokio-tungstenite v0.17.1
[INFO] [stderr]   Downloaded rustls-pemfile v0.2.1
[INFO] [stderr]   Downloaded quinn-udp v0.1.1
[INFO] [stderr]   Downloaded quinn v0.8.2
[INFO] [stderr]   Downloaded tungstenite v0.17.2
[INFO] [stderr]   Downloaded hebo_codec v0.1.4
[INFO] [stderr]   Downloaded quinn-proto v0.8.2
[INFO] [stderr]   Downloaded rustls v0.20.5
[INFO] [stderr]   Downloaded syn v1.0.95
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[INFO] [stdout] 7d3085497feba2d9f0ed7bc323e845aee3728842619db586d00ad19ba3741f36
[INFO] running `Command { std: "docker" "start" "-a" "7d3085497feba2d9f0ed7bc323e845aee3728842619db586d00ad19ba3741f36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7d3085497feba2d9f0ed7bc323e845aee3728842619db586d00ad19ba3741f36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7d3085497feba2d9f0ed7bc323e845aee3728842619db586d00ad19ba3741f36", kill_on_drop: false }`
[INFO] [stdout] 7d3085497feba2d9f0ed7bc323e845aee3728842619db586d00ad19ba3741f36
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 45b10d563343250b58592926230fb41eeb91fec543afed60521465675da00856
[INFO] running `Command { std: "docker" "start" "-a" "45b10d563343250b58592926230fb41eeb91fec543afed60521465675da00856", kill_on_drop: false }`
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[INFO] [stderr]     Checking ruo v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `tungstenite` is imported redundantly
[INFO] [stdout]  --> src/error.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use tokio_tungstenite::tungstenite;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the item `tungstenite` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `tokio_tungstenite` is imported redundantly
[INFO] [stdout]   --> src/stream.rs:17:25
[INFO] [stdout]    |
[INFO] [stdout] 17 | use tokio_tungstenite::{self, tungstenite::protocol::Message, WebSocketStream};
[INFO] [stdout]    |                         ^^^^ the item `tokio_tungstenite` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Into` is imported redundantly
[INFO] [stdout]  --> src/blocking/stream.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::convert::Into;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Into` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `tungstenite` is imported redundantly
[INFO] [stdout]  --> src/error.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use tokio_tungstenite::tungstenite;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the item `tungstenite` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `tokio_tungstenite` is imported redundantly
[INFO] [stdout]   --> src/stream.rs:17:25
[INFO] [stdout]    |
[INFO] [stdout] 17 | use tokio_tungstenite::{self, tungstenite::protocol::Message, WebSocketStream};
[INFO] [stdout]    |                         ^^^^ the item `tokio_tungstenite` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Into` is imported redundantly
[INFO] [stdout]  --> src/blocking/stream.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::convert::Into;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Into` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::future::Future`
[INFO] [stdout]  --> examples/uds.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::future::Future;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `on_connect` is never used
[INFO] [stdout]   --> examples/uds.rs:11:10
[INFO] [stdout]    |
[INFO] [stdout] 11 | async fn on_connect(client: &mut Client) {
[INFO] [stdout]    |          ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `on_connect` is never used
[INFO] [stdout]   --> examples/quic.rs:10:10
[INFO] [stdout]    |
[INFO] [stdout] 10 | async fn on_connect(client: &mut Client) {
[INFO] [stdout]    |          ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `on_connect` is never used
[INFO] [stdout]   --> examples/mqtt.rs:10:10
[INFO] [stdout]    |
[INFO] [stdout] 10 | async fn on_connect(client: &mut Client) {
[INFO] [stdout]    |          ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 15.96s
[INFO] running `Command { std: "docker" "inspect" "45b10d563343250b58592926230fb41eeb91fec543afed60521465675da00856", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "45b10d563343250b58592926230fb41eeb91fec543afed60521465675da00856", kill_on_drop: false }`
[INFO] [stdout] 45b10d563343250b58592926230fb41eeb91fec543afed60521465675da00856