[INFO] fetching crate unflatter 0.1.1...
[INFO] checking unflatter-0.1.1 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate unflatter 0.1.1 into /workspace/builds/worker-3-tc2/source
[INFO] started tweaking crates.io crate unflatter 0.1.1
[INFO] finished tweaking crates.io crate unflatter 0.1.1
[INFO] tweaked toml for crates.io crate unflatter 0.1.1 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate unflatter 0.1.1 on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 17 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "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-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e171b84447b3294a04ba72d439897db60781a5c3197740404493fae047adf791
[INFO] running `Command { std: "docker" "start" "-a" "e171b84447b3294a04ba72d439897db60781a5c3197740404493fae047adf791", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e171b84447b3294a04ba72d439897db60781a5c3197740404493fae047adf791", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e171b84447b3294a04ba72d439897db60781a5c3197740404493fae047adf791", kill_on_drop: false }`
[INFO] [stdout] e171b84447b3294a04ba72d439897db60781a5c3197740404493fae047adf791
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d92da5ba2985939d753007ab725647572aef7a418411c178b20085ddfdf84d81
[INFO] running `Command { std: "docker" "start" "-a" "d92da5ba2985939d753007ab725647572aef7a418411c178b20085ddfdf84d81", kill_on_drop: false }`
[INFO] [stderr]     Checking unflatter v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/lib.rs:647:13
[INFO] [stdout]     |
[INFO] [stdout] 647 |             Ok::<_, Infallible>(1_usize).unwrap_all_or_default::<usize>()
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/lib.rs:651:13
[INFO] [stdout]     |
[INFO] [stdout] 651 |             Ok::<_, Infallible>(Ok::<_, Infallible>(1_usize)).unwrap_all_or_default::<usize>()
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Result<usize, Infallible>, Infallible>
[INFO] [stdout]    --> src/lib.rs:651:13
[INFO] [stdout]     |
[INFO] [stdout] 651 |             Ok::<_, Infallible>(Ok::<_, Infallible>(1_usize)).unwrap_all_or_default::<usize>()
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/lib.rs:651:33
[INFO] [stdout]     |
[INFO] [stdout] 651 |             Ok::<_, Infallible>(Ok::<_, Infallible>(1_usize)).unwrap_all_or_default::<usize>()
[INFO] [stdout]     |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this type continue be must used: Result<Result<usize, std::io::Error>, Infallible>
[INFO] [stdout]    --> src/lib.rs:655:13
[INFO] [stdout]     |
[INFO] [stdout] 655 | /             Ok::<_, Infallible>(Ok::<_, Infallible>(Err::<usize, _>(std::io::Error::from(
[INFO] [stdout] 656 | |                 ErrorKind::AddrInUse
[INFO] [stdout] 657 | |             ))))
[INFO] [stdout]     | |________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mustuse_in_always_ok)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this type continue be must used: Result<Result<Result<usize, std::io::Error>, Infallible>, Infallible>
[INFO] [stdout]    --> src/lib.rs:655:13
[INFO] [stdout]     |
[INFO] [stdout] 655 | /             Ok::<_, Infallible>(Ok::<_, Infallible>(Err::<usize, _>(std::io::Error::from(
[INFO] [stdout] 656 | |                 ErrorKind::AddrInUse
[INFO] [stdout] 657 | |             ))))
[INFO] [stdout]     | |________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this type continue be must used: Result<Result<usize, std::io::Error>, Infallible>
[INFO] [stdout]    --> src/lib.rs:655:33
[INFO] [stdout]     |
[INFO] [stdout] 655 |               Ok::<_, Infallible>(Ok::<_, Infallible>(Err::<usize, _>(std::io::Error::from(
[INFO] [stdout]     |  _________________________________^
[INFO] [stdout] 656 | |                 ErrorKind::AddrInUse
[INFO] [stdout] 657 | |             ))))
[INFO] [stdout]     | |_______________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `unflatter` (lib test) due to 4 previous errors; 3 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "d92da5ba2985939d753007ab725647572aef7a418411c178b20085ddfdf84d81", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d92da5ba2985939d753007ab725647572aef7a418411c178b20085ddfdf84d81", kill_on_drop: false }`
[INFO] [stdout] d92da5ba2985939d753007ab725647572aef7a418411c178b20085ddfdf84d81