[INFO] fetching crate xwt-core 0.9.0...
[INFO] checking xwt-core-0.9.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate xwt-core 0.9.0 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate xwt-core 0.9.0
[INFO] finished tweaking crates.io crate xwt-core 0.9.0
[INFO] tweaked toml for crates.io crate xwt-core 0.9.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate xwt-core 0.9.0 on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate xwt-core 0.9.0 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--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-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 92f93b99c1a13d239559d37b12c200d2b65954f4296e94706f333295bed9a8ca
[INFO] running `Command { std: "docker" "start" "-a" "92f93b99c1a13d239559d37b12c200d2b65954f4296e94706f333295bed9a8ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "92f93b99c1a13d239559d37b12c200d2b65954f4296e94706f333295bed9a8ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "92f93b99c1a13d239559d37b12c200d2b65954f4296e94706f333295bed9a8ca", kill_on_drop: false }`
[INFO] [stdout] 92f93b99c1a13d239559d37b12c200d2b65954f4296e94706f333295bed9a8ca
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 97e5bbb9a34745a0b8980835116899b0eee0d49159fe56f1a070c92b1fb4a672
[INFO] running `Command { std: "docker" "start" "-a" "97e5bbb9a34745a0b8980835116899b0eee0d49159fe56f1a070c92b1fb4a672", kill_on_drop: false }`
[INFO] [stderr]     Checking xwt-core v0.9.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<<T as SendSpec>::SendStream, Infallible>
[INFO] [stdout]   --> src/utils/dummy.rs:52:81
[INFO] [stdout]    |
[INFO] [stdout] 52 |       async fn wait_uni(self) -> Result<<T as SendSpec>::SendStream, Self::Error> {
[INFO] [stdout]    |  _________________________________________________________________________________^
[INFO] [stdout] 53 | |         Ok(self.0)
[INFO] [stdout] 54 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<<T as SendSpec>::SendStream, Infallible>
[INFO] [stdout]   --> src/utils/dummy.rs:52:81
[INFO] [stdout]    |
[INFO] [stdout] 52 |       async fn wait_uni(self) -> Result<<T as SendSpec>::SendStream, Self::Error> {
[INFO] [stdout]    |  _________________________________________________________________________________^
[INFO] [stdout] 53 | |         Ok(self.0)
[INFO] [stdout] 54 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<<T as SendSpec>::SendStream, Infallible>
[INFO] [stdout]   --> src/utils/dummy.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 53 |         Ok(self.0)
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<(<T as SendSpec>::SendStream, <T as RecvSpec>::RecvStream), Infallible>
[INFO] [stdout]   --> src/utils/dummy.rs:74:81
[INFO] [stdout]    |
[INFO] [stdout] 74 |       async fn wait_bi(self) -> Result<session::stream::TupleFor<T>, Self::Error> {
[INFO] [stdout]    |  _________________________________________________________________________________^
[INFO] [stdout] 75 | |         Ok(self.0)
[INFO] [stdout] 76 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<(<T as SendSpec>::SendStream, <T as RecvSpec>::RecvStream), Infallible>
[INFO] [stdout]   --> src/utils/dummy.rs:74:81
[INFO] [stdout]    |
[INFO] [stdout] 74 |       async fn wait_bi(self) -> Result<session::stream::TupleFor<T>, Self::Error> {
[INFO] [stdout]    |  _________________________________________________________________________________^
[INFO] [stdout] 75 | |         Ok(self.0)
[INFO] [stdout] 76 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<(<T as SendSpec>::SendStream, <T as RecvSpec>::RecvStream), Infallible>
[INFO] [stdout]   --> src/utils/dummy.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |         Ok(self.0)
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `xwt-core` (lib test) due to 6 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<<T as SendSpec>::SendStream, Infallible>
[INFO] [stdout]   --> src/utils/dummy.rs:52:81
[INFO] [stdout]    |
[INFO] [stdout] 52 |       async fn wait_uni(self) -> Result<<T as SendSpec>::SendStream, Self::Error> {
[INFO] [stdout]    |  _________________________________________________________________________________^
[INFO] [stdout] 53 | |         Ok(self.0)
[INFO] [stdout] 54 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<<T as SendSpec>::SendStream, Infallible>
[INFO] [stdout]   --> src/utils/dummy.rs:52:81
[INFO] [stdout]    |
[INFO] [stdout] 52 |       async fn wait_uni(self) -> Result<<T as SendSpec>::SendStream, Self::Error> {
[INFO] [stdout]    |  _________________________________________________________________________________^
[INFO] [stdout] 53 | |         Ok(self.0)
[INFO] [stdout] 54 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<<T as SendSpec>::SendStream, Infallible>
[INFO] [stdout]   --> src/utils/dummy.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 53 |         Ok(self.0)
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<(<T as SendSpec>::SendStream, <T as RecvSpec>::RecvStream), Infallible>
[INFO] [stdout]   --> src/utils/dummy.rs:74:81
[INFO] [stdout]    |
[INFO] [stdout] 74 |       async fn wait_bi(self) -> Result<session::stream::TupleFor<T>, Self::Error> {
[INFO] [stdout]    |  _________________________________________________________________________________^
[INFO] [stdout] 75 | |         Ok(self.0)
[INFO] [stdout] 76 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<(<T as SendSpec>::SendStream, <T as RecvSpec>::RecvStream), Infallible>
[INFO] [stdout]   --> src/utils/dummy.rs:74:81
[INFO] [stdout]    |
[INFO] [stdout] 74 |       async fn wait_bi(self) -> Result<session::stream::TupleFor<T>, Self::Error> {
[INFO] [stdout]    |  _________________________________________________________________________________^
[INFO] [stdout] 75 | |         Ok(self.0)
[INFO] [stdout] 76 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<(<T as SendSpec>::SendStream, <T as RecvSpec>::RecvStream), Infallible>
[INFO] [stdout]   --> src/utils/dummy.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |         Ok(self.0)
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `xwt-core` (lib) due to 6 previous errors
[INFO] running `Command { std: "docker" "inspect" "97e5bbb9a34745a0b8980835116899b0eee0d49159fe56f1a070c92b1fb4a672", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "97e5bbb9a34745a0b8980835116899b0eee0d49159fe56f1a070c92b1fb4a672", kill_on_drop: false }`
[INFO] [stdout] 97e5bbb9a34745a0b8980835116899b0eee0d49159fe56f1a070c92b1fb4a672