[INFO] fetching crate tender 0.1.1...
[INFO] checking tender-0.1.1 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate tender 0.1.1 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate tender 0.1.1
[INFO] finished tweaking crates.io crate tender 0.1.1
[INFO] tweaked toml for crates.io crate tender 0.1.1 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate tender 0.1.1 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 34 packages to latest compatible versions
[INFO] [stderr]       Adding env_logger v0.9.3 (available: v0.11.8)
[INFO] [stderr]       Adding fastrand v1.9.0 (available: v2.3.0)
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 81810003c32359d99233a3fd587b565cc6d49087810bea796220fb87fde8f55e
[INFO] running `Command { std: "docker" "start" "-a" "81810003c32359d99233a3fd587b565cc6d49087810bea796220fb87fde8f55e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "81810003c32359d99233a3fd587b565cc6d49087810bea796220fb87fde8f55e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "81810003c32359d99233a3fd587b565cc6d49087810bea796220fb87fde8f55e", kill_on_drop: false }`
[INFO] [stdout] 81810003c32359d99233a3fd587b565cc6d49087810bea796220fb87fde8f55e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] fb0a3e46223db643cf9755b584efd54a049e6cb7c0a4160afba717e43b720f51
[INFO] running `Command { std: "docker" "start" "-a" "fb0a3e46223db643cf9755b584efd54a049e6cb7c0a4160afba717e43b720f51", kill_on_drop: false }`
[INFO] [stderr]     Checking sync-wait-group v0.1.1
[INFO] [stderr]     Checking watch v0.2.3
[INFO] [stderr]     Checking env_logger v0.9.3
[INFO] [stderr]     Checking tender v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/core/observer.rs:17:16
[INFO] [stdout]    |
[INFO] [stdout] 17 |     pub fn run(mut self) {
[INFO] [stdout]    |                ----^^^^
[INFO] [stdout]    |                |
[INFO] [stdout]    |                help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/core/observer.rs:17:16
[INFO] [stdout]    |
[INFO] [stdout] 17 |     pub fn run(mut self) {
[INFO] [stdout]    |                ----^^^^
[INFO] [stdout]    |                |
[INFO] [stdout]    |                help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<HardState<T>, Infallible>
[INFO] [stdout]    --> tests/fixtures.rs:147:79
[INFO] [stdout]     |
[INFO] [stdout] 147 |       fn load_hard_state(&self) -> std::result::Result<HardState<T>, Self::Err> {
[INFO] [stdout]     |  _______________________________________________________________________________^
[INFO] [stdout] 148 | |         Ok(self.hard_state.lock().clone())
[INFO] [stdout] 149 | |     }
[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<HardState<T>, Infallible>
[INFO] [stdout]    --> tests/fixtures.rs:148:9
[INFO] [stdout]     |
[INFO] [stdout] 148 |         Ok(self.hard_state.lock().clone())
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<<T as ElectionType>::VoteFactor, Infallible>
[INFO] [stdout]    --> tests/fixtures.rs:157:81
[INFO] [stdout]     |
[INFO] [stdout] 157 |       fn load_vote_factor(&self) -> std::result::Result<T::VoteFactor, Self::Err> {
[INFO] [stdout]     |  _________________________________________________________________________________^
[INFO] [stdout] 158 | |         Ok(self.vote_factor.clone())
[INFO] [stdout] 159 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<<T as ElectionType>::VoteFactor, Infallible>
[INFO] [stdout]    --> tests/fixtures.rs:158:9
[INFO] [stdout]     |
[INFO] [stdout] 158 |         Ok(self.vote_factor.clone())
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `tender` (test "fixtures") due to 4 previous errors
[INFO] [stdout] error: this type will no longer be must used: Result<HardState<T>, Infallible>
[INFO] [stdout]    --> tests/fixtures.rs:147:79
[INFO] [stdout]     |
[INFO] [stdout] 147 |       fn load_hard_state(&self) -> std::result::Result<HardState<T>, Self::Err> {
[INFO] [stdout]     |  _______________________________________________________________________________^
[INFO] [stdout] 148 | |         Ok(self.hard_state.lock().clone())
[INFO] [stdout] 149 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<HardState<T>, Infallible>
[INFO] [stdout]    --> tests/fixtures.rs:148:9
[INFO] [stdout]     |
[INFO] [stdout] 148 |         Ok(self.hard_state.lock().clone())
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<<T as ElectionType>::VoteFactor, Infallible>
[INFO] [stdout]    --> tests/fixtures.rs:157:81
[INFO] [stdout]     |
[INFO] [stdout] 157 |       fn load_vote_factor(&self) -> std::result::Result<T::VoteFactor, Self::Err> {
[INFO] [stdout]     |  _________________________________________________________________________________^
[INFO] [stdout] 158 | |         Ok(self.vote_factor.clone())
[INFO] [stdout] 159 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<<T as ElectionType>::VoteFactor, Infallible>
[INFO] [stdout]    --> tests/fixtures.rs:158:9
[INFO] [stdout]     |
[INFO] [stdout] 158 |         Ok(self.vote_factor.clone())
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `tender` (test "group_election") due to 4 previous errors
[INFO] [stdout] error: this type will no longer be must used: Result<HardState<T>, Infallible>
[INFO] [stdout]    --> tests/fixtures.rs:147:79
[INFO] [stdout]     |
[INFO] [stdout] 147 |       fn load_hard_state(&self) -> std::result::Result<HardState<T>, Self::Err> {
[INFO] [stdout]     |  _______________________________________________________________________________^
[INFO] [stdout] 148 | |         Ok(self.hard_state.lock().clone())
[INFO] [stdout] 149 | |     }
[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<HardState<T>, Infallible>
[INFO] [stdout]    --> tests/fixtures.rs:148:9
[INFO] [stdout]     |
[INFO] [stdout] 148 |         Ok(self.hard_state.lock().clone())
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<<T as ElectionType>::VoteFactor, Infallible>
[INFO] [stdout]    --> tests/fixtures.rs:157:81
[INFO] [stdout]     |
[INFO] [stdout] 157 |       fn load_vote_factor(&self) -> std::result::Result<T::VoteFactor, Self::Err> {
[INFO] [stdout]     |  _________________________________________________________________________________^
[INFO] [stdout] 158 | |         Ok(self.vote_factor.clone())
[INFO] [stdout] 159 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<<T as ElectionType>::VoteFactor, Infallible>
[INFO] [stdout]    --> tests/fixtures.rs:158:9
[INFO] [stdout]     |
[INFO] [stdout] 158 |         Ok(self.vote_factor.clone())
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `tender` (test "single_node") due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "fb0a3e46223db643cf9755b584efd54a049e6cb7c0a4160afba717e43b720f51", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb0a3e46223db643cf9755b584efd54a049e6cb7c0a4160afba717e43b720f51", kill_on_drop: false }`
[INFO] [stdout] fb0a3e46223db643cf9755b584efd54a049e6cb7c0a4160afba717e43b720f51