[INFO] fetching crate infinite-iterator 0.1.0...
[INFO] checking infinite-iterator-0.1.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate infinite-iterator 0.1.0 into /workspace/builds/worker-3-tc2/source
[INFO] started tweaking crates.io crate infinite-iterator 0.1.0
[INFO] finished tweaking crates.io crate infinite-iterator 0.1.0
[INFO] tweaked toml for crates.io crate infinite-iterator 0.1.0 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate infinite-iterator 0.1.0 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] 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]     Blocking waiting for file lock on package cache
[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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 6c26c7fd5fabc464fed783730eb0662af95ce2d38af88a992d68aa67a0839b26
[INFO] running `Command { std: "docker" "start" "-a" "6c26c7fd5fabc464fed783730eb0662af95ce2d38af88a992d68aa67a0839b26", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6c26c7fd5fabc464fed783730eb0662af95ce2d38af88a992d68aa67a0839b26", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6c26c7fd5fabc464fed783730eb0662af95ce2d38af88a992d68aa67a0839b26", kill_on_drop: false }`
[INFO] [stdout] 6c26c7fd5fabc464fed783730eb0662af95ce2d38af88a992d68aa67a0839b26
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] eb07d5973f77a0fac626e6e310095d2879b77a17fc749212bf4376c98b84bea5
[INFO] running `Command { std: "docker" "start" "-a" "eb07d5973f77a0fac626e6e310095d2879b77a17fc749212bf4376c98b84bea5", kill_on_drop: false }`
[INFO] [stderr]     Checking infinite-iterator v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<<I as Iterator>::Item, NeverBreak>
[INFO] [stdout]    --> src/lib.rs:491:67
[INFO] [stdout]     |
[INFO] [stdout] 491 |           pub fn try_next(&mut self) -> Result<I::Item, NeverBreak> {
[INFO] [stdout]     |  ___________________________________________________________________^
[INFO] [stdout] 492 | |             Ok(self.0.next_infinite())
[INFO] [stdout] 493 | |         }
[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<<I as Iterator>::Item, NeverBreak>
[INFO] [stdout]    --> src/lib.rs:492:13
[INFO] [stdout]     |
[INFO] [stdout] 492 |             Ok(self.0.next_infinite())
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<<I as Iterator>::Item, NeverBreak>
[INFO] [stdout]    --> src/lib.rs:491:67
[INFO] [stdout]     |
[INFO] [stdout] 491 |           pub fn try_next(&mut self) -> Result<I::Item, NeverBreak> {
[INFO] [stdout]     |  ___________________________________________________________________^
[INFO] [stdout] 492 | |             Ok(self.0.next_infinite())
[INFO] [stdout] 493 | |         }
[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<<I as Iterator>::Item, NeverBreak>
[INFO] [stdout]    --> src/lib.rs:492:13
[INFO] [stdout]     |
[INFO] [stdout] 492 |             Ok(self.0.next_infinite())
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `infinite-iterator` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `infinite-iterator` (lib test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "eb07d5973f77a0fac626e6e310095d2879b77a17fc749212bf4376c98b84bea5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb07d5973f77a0fac626e6e310095d2879b77a17fc749212bf4376c98b84bea5", kill_on_drop: false }`
[INFO] [stdout] eb07d5973f77a0fac626e6e310095d2879b77a17fc749212bf4376c98b84bea5
