[INFO] fetching crate mao_core 0.1.0...
[INFO] checking mao_core-0.1.0 against try#c387b04bf028733cd561d62128c8a5eee4bc1458+rustflags=-Dtail_expr_drop_order for pr-130930
[INFO] extracting crate mao_core 0.1.0 into /workspace/builds/worker-1-tc2/source
[INFO] validating manifest of crates.io crate mao_core 0.1.0 on toolchain c387b04bf028733cd561d62128c8a5eee4bc1458
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mao_core 0.1.0
[INFO] finished tweaking crates.io crate mao_core 0.1.0
[INFO] tweaked toml for crates.io crate mao_core 0.1.0 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate crates.io crate mao_core 0.1.0 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" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ded2f187ead6ad17cdc33b38566fc153b54828a6dd67facbd4780abb3a4655dc
[INFO] running `Command { std: "docker" "start" "-a" "ded2f187ead6ad17cdc33b38566fc153b54828a6dd67facbd4780abb3a4655dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ded2f187ead6ad17cdc33b38566fc153b54828a6dd67facbd4780abb3a4655dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ded2f187ead6ad17cdc33b38566fc153b54828a6dd67facbd4780abb3a4655dc", kill_on_drop: false }`
[INFO] [stdout] ded2f187ead6ad17cdc33b38566fc153b54828a6dd67facbd4780abb3a4655dc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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 -Dtail_expr_drop_order" "-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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dc98036ee6338cde6b39e5c10914a1261768e9c28b94e42f15522cee54cebfbb
[INFO] running `Command { std: "docker" "start" "-a" "dc98036ee6338cde6b39e5c10914a1261768e9c28b94e42f15522cee54cebfbb", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.154
[INFO] [stderr]    Compiling anyhow v1.0.83
[INFO] [stderr]     Checking libloading v0.8.3
[INFO] [stderr]     Checking getrandom v0.2.15
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking mao_core v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/mao_struct.rs:621:17
[INFO] [stdout]     |
[INFO] [stdout] 621 |                 drop(stack);
[INFO] [stdout]     |                 ^^^^^-----^
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      argument has type `&Stack`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 621 -                 drop(stack);
[INFO] [stdout] 621 +                 let _ = stack;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/mao_struct.rs:652:17
[INFO] [stdout]     |
[INFO] [stdout] 652 |                 drop(stack);
[INFO] [stdout]     |                 ^^^^^-----^
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      argument has type `&Stack`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 652 -                 drop(stack);
[INFO] [stdout] 652 +                 let _ = stack;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/mao_struct.rs:621:17
[INFO] [stdout]     |
[INFO] [stdout] 621 |                 drop(stack);
[INFO] [stdout]     |                 ^^^^^-----^
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      argument has type `&Stack`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 621 -                 drop(stack);
[INFO] [stdout] 621 +                 let _ = stack;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/mao_struct.rs:652:17
[INFO] [stdout]     |
[INFO] [stdout] 652 |                 drop(stack);
[INFO] [stdout]     |                 ^^^^^-----^
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      argument has type `&Stack`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 652 -                 drop(stack);
[INFO] [stdout] 652 +                 let _ = stack;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.60s
[INFO] running `Command { std: "docker" "inspect" "dc98036ee6338cde6b39e5c10914a1261768e9c28b94e42f15522cee54cebfbb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dc98036ee6338cde6b39e5c10914a1261768e9c28b94e42f15522cee54cebfbb", kill_on_drop: false }`
[INFO] [stdout] dc98036ee6338cde6b39e5c10914a1261768e9c28b94e42f15522cee54cebfbb