[INFO] fetching crate fnmutant 0.1.0...
[INFO] checking fnmutant-0.1.0 against try#998b6603a58e47f42ccce7a67943234e96b6839e for pr-143170
[INFO] extracting crate fnmutant 0.1.0 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate fnmutant 0.1.0
[INFO] finished tweaking crates.io crate fnmutant 0.1.0
[INFO] tweaked toml for crates.io crate fnmutant 0.1.0 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate fnmutant 0.1.0 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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] c37c5e5222ccc7eb6e901e3510b5760ad189616cbd239c90243f6bf9093455e6
[INFO] running `Command { std: "docker" "start" "-a" "c37c5e5222ccc7eb6e901e3510b5760ad189616cbd239c90243f6bf9093455e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c37c5e5222ccc7eb6e901e3510b5760ad189616cbd239c90243f6bf9093455e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c37c5e5222ccc7eb6e901e3510b5760ad189616cbd239c90243f6bf9093455e6", kill_on_drop: false }`
[INFO] [stdout] c37c5e5222ccc7eb6e901e3510b5760ad189616cbd239c90243f6bf9093455e6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 9aab64694ab359203d4cda3fe0525014e75b46afbb795f9469a1359156744447
[INFO] running `Command { std: "docker" "start" "-a" "9aab64694ab359203d4cda3fe0525014e75b46afbb795f9469a1359156744447", kill_on_drop: false }`
[INFO] [stderr]     Checking fnmutant v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: calls to `std::mem::drop` with a value that implements `Copy` does nothing
[INFO] [stdout]   --> src/lib.rs:63:13
[INFO] [stdout]    |
[INFO] [stdout] 63 |             drop(xs);
[INFO] [stdout]    |             ^^^^^--^
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  argument has type `[i32; 6]`
[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] 63 -             drop(xs);
[INFO] [stdout] 63 +             let _ = xs;
[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/lib.rs:70:13
[INFO] [stdout]    |
[INFO] [stdout] 70 |             drop(xs);
[INFO] [stdout]    |             ^^^^^--^
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  argument has type `[i32; 6]`
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 70 -             drop(xs);
[INFO] [stdout] 70 +             let _ = xs;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.17s
[INFO] running `Command { std: "docker" "inspect" "9aab64694ab359203d4cda3fe0525014e75b46afbb795f9469a1359156744447", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9aab64694ab359203d4cda3fe0525014e75b46afbb795f9469a1359156744447", kill_on_drop: false }`
[INFO] [stdout] 9aab64694ab359203d4cda3fe0525014e75b46afbb795f9469a1359156744447