[INFO] fetching crate rich-result 0.1.2...
[INFO] checking rich-result-0.1.2 against try#998b6603a58e47f42ccce7a67943234e96b6839e for pr-143170
[INFO] extracting crate rich-result 0.1.2 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate rich-result 0.1.2
[INFO] finished tweaking crates.io crate rich-result 0.1.2
[INFO] tweaked toml for crates.io crate rich-result 0.1.2 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate rich-result 0.1.2 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] [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-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] cef453cdc6028c2ea7f8ea4c104ea7cb66c61dcdf3d9b85e4dfc953d524c026a
[INFO] running `Command { std: "docker" "start" "-a" "cef453cdc6028c2ea7f8ea4c104ea7cb66c61dcdf3d9b85e4dfc953d524c026a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cef453cdc6028c2ea7f8ea4c104ea7cb66c61dcdf3d9b85e4dfc953d524c026a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cef453cdc6028c2ea7f8ea4c104ea7cb66c61dcdf3d9b85e4dfc953d524c026a", kill_on_drop: false }`
[INFO] [stdout] cef453cdc6028c2ea7f8ea4c104ea7cb66c61dcdf3d9b85e4dfc953d524c026a
[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] 99fbc174a60055dbbf8e4ef1e80f3c90171e7d62b606ff10f0abfbd1520269ef
[INFO] running `Command { std: "docker" "start" "-a" "99fbc174a60055dbbf8e4ef1e80f3c90171e7d62b606ff10f0abfbd1520269ef", kill_on_drop: false }`
[INFO] [stderr]     Checking rich-result v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `CollectSum` is never constructed
[INFO] [stdout]   --> src/lib.rs:80:8
[INFO] [stdout]    |
[INFO] [stdout] 80 | struct CollectSum<T>(T);
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `CollectProduct` is never constructed
[INFO] [stdout]   --> src/lib.rs:91:8
[INFO] [stdout]    |
[INFO] [stdout] 91 | struct CollectProduct<T>(T);
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `CollectSum` is never constructed
[INFO] [stdout]   --> src/lib.rs:80:8
[INFO] [stdout]    |
[INFO] [stdout] 80 | struct CollectSum<T>(T);
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `CollectProduct` is never constructed
[INFO] [stdout]   --> src/lib.rs:91:8
[INFO] [stdout]    |
[INFO] [stdout] 91 | struct CollectProduct<T>(T);
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `LocalResult` that must be used
[INFO] [stdout]     --> src/lib.rs:1058:49
[INFO] [stdout]      |
[INFO] [stdout] 1058 |             fn this_should_warn() -> ResultTy { result()?; Ok(OkTy) }
[INFO] [stdout]      |                                                 ^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1058 |             fn this_should_warn() -> ResultTy { let _ = result()?; Ok(OkTy) }
[INFO] [stdout]      |                                                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.49s
[INFO] running `Command { std: "docker" "inspect" "99fbc174a60055dbbf8e4ef1e80f3c90171e7d62b606ff10f0abfbd1520269ef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "99fbc174a60055dbbf8e4ef1e80f3c90171e7d62b606ff10f0abfbd1520269ef", kill_on_drop: false }`
[INFO] [stdout] 99fbc174a60055dbbf8e4ef1e80f3c90171e7d62b606ff10f0abfbd1520269ef