[INFO] fetching crate iterators-collection 0.3.3...
[INFO] checking iterators-collection-0.3.3 against try#de0e80659cee4f27282e60d63bbb8c5271a0d147 for pr-129392
[INFO] extracting crate iterators-collection 0.3.3 into /workspace/builds/worker-2-tc2/source
[INFO] validating manifest of crates.io crate iterators-collection 0.3.3 on toolchain de0e80659cee4f27282e60d63bbb8c5271a0d147
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+de0e80659cee4f27282e60d63bbb8c5271a0d147" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+de0e80659cee4f27282e60d63bbb8c5271a0d147" "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" "+de0e80659cee4f27282e60d63bbb8c5271a0d147" "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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+de0e80659cee4f27282e60d63bbb8c5271a0d147" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6514779001dc4ebfb8fff2a6fc96ca74b7c4758b47fb9c9c7df257eb58ad9001
[INFO] running `Command { std: "docker" "start" "-a" "6514779001dc4ebfb8fff2a6fc96ca74b7c4758b47fb9c9c7df257eb58ad9001", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6514779001dc4ebfb8fff2a6fc96ca74b7c4758b47fb9c9c7df257eb58ad9001", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6514779001dc4ebfb8fff2a6fc96ca74b7c4758b47fb9c9c7df257eb58ad9001", kill_on_drop: false }`
[INFO] [stdout] 6514779001dc4ebfb8fff2a6fc96ca74b7c4758b47fb9c9c7df257eb58ad9001
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+de0e80659cee4f27282e60d63bbb8c5271a0d147" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 20a30367a76012fa3b59b47d2ca99a470d9c4c99420726130e94f06b974bf064
[INFO] running `Command { std: "docker" "start" "-a" "20a30367a76012fa3b59b47d2ca99a470d9c4c99420726130e94f06b974bf064", 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: 1 warning emitted
[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] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.35s
[INFO] running `Command { std: "docker" "inspect" "20a30367a76012fa3b59b47d2ca99a470d9c4c99420726130e94f06b974bf064", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "20a30367a76012fa3b59b47d2ca99a470d9c4c99420726130e94f06b974bf064", kill_on_drop: false }`
[INFO] [stdout] 20a30367a76012fa3b59b47d2ca99a470d9c4c99420726130e94f06b974bf064