[INFO] fetching crate iterators-collection 0.3.3...
[INFO] checking iterators-collection-0.3.3 against try#998b6603a58e47f42ccce7a67943234e96b6839e for pr-143170
[INFO] extracting crate iterators-collection 0.3.3 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate iterators-collection 0.3.3
[INFO] finished tweaking crates.io crate iterators-collection 0.3.3
[INFO] tweaked toml for crates.io crate iterators-collection 0.3.3 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate iterators-collection 0.3.3 on toolchain 998b6603a58e47f42ccce7a67943234e96b6839e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "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" "+998b6603a58e47f42ccce7a67943234e96b6839e" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6fa5692c5f06fddad758e4d65e476d704c220e1ce17274ae26f4daa06520f8fa
[INFO] running `Command { std: "docker" "start" "-a" "6fa5692c5f06fddad758e4d65e476d704c220e1ce17274ae26f4daa06520f8fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6fa5692c5f06fddad758e4d65e476d704c220e1ce17274ae26f4daa06520f8fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6fa5692c5f06fddad758e4d65e476d704c220e1ce17274ae26f4daa06520f8fa", kill_on_drop: false }`
[INFO] [stdout] 6fa5692c5f06fddad758e4d65e476d704c220e1ce17274ae26f4daa06520f8fa
[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" "-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3e909443c101f64eadbd5550fbaaa17a52a50916af03c258c0294e22a1ab01a6
[INFO] running `Command { std: "docker" "start" "-a" "3e909443c101f64eadbd5550fbaaa17a52a50916af03c258c0294e22a1ab01a6", kill_on_drop: false }`
[INFO] [stderr]     Checking iterators-collection v0.3.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: calls to `std::mem::drop` with a value that implements `Copy` does nothing
[INFO] [stdout]    --> src/share/mod.rs:166:9
[INFO] [stdout]     |
[INFO] [stdout] 166 |         std::mem::drop(self.increment()); // Dropping is a way to ignore the error which doesn't matter here
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^----------------^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `Result<(), ()>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_copy_types)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 166 -         std::mem::drop(self.increment()); // Dropping is a way to ignore the error which doesn't matter here
[INFO] [stdout] 166 +         let _ = self.increment(); // Dropping is a way to ignore the error which doesn't matter here
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a value that implements `Copy` does nothing
[INFO] [stdout]    --> src/share/mod.rs:166:9
[INFO] [stdout]     |
[INFO] [stdout] 166 |         std::mem::drop(self.increment()); // Dropping is a way to ignore the error which doesn't matter here
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^----------------^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `Result<(), ()>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_copy_types)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 166 -         std::mem::drop(self.increment()); // Dropping is a way to ignore the error which doesn't matter here
[INFO] [stdout] 166 +         let _ = self.increment(); // Dropping is a way to ignore the error which doesn't matter here
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.40s
[INFO] running `Command { std: "docker" "inspect" "3e909443c101f64eadbd5550fbaaa17a52a50916af03c258c0294e22a1ab01a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3e909443c101f64eadbd5550fbaaa17a52a50916af03c258c0294e22a1ab01a6", kill_on_drop: false }`
[INFO] [stdout] 3e909443c101f64eadbd5550fbaaa17a52a50916af03c258c0294e22a1ab01a6