[INFO] fetching crate tower-discover 0.3.0... [INFO] checking tower-discover-0.3.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577 [INFO] extracting crate tower-discover 0.3.0 into /workspace/builds/worker-4-tc2/source [INFO] started tweaking crates.io crate tower-discover 0.3.0 [INFO] finished tweaking crates.io crate tower-discover 0.3.0 [INFO] tweaked toml for crates.io crate tower-discover 0.3.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml [INFO] validating manifest of crates.io crate tower-discover 0.3.0 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 8 packages to latest compatible versions [INFO] [stderr] Adding pin-project v0.4.30 (available: v1.1.10) [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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 33e8a4edeeb88978e4dd7da87f47cc96c7e9cda80e85eca91f71397f3a89fdde [INFO] running `Command { std: "docker" "start" "-a" "33e8a4edeeb88978e4dd7da87f47cc96c7e9cda80e85eca91f71397f3a89fdde", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "33e8a4edeeb88978e4dd7da87f47cc96c7e9cda80e85eca91f71397f3a89fdde", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "33e8a4edeeb88978e4dd7da87f47cc96c7e9cda80e85eca91f71397f3a89fdde", kill_on_drop: false }` [INFO] [stdout] 33e8a4edeeb88978e4dd7da87f47cc96c7e9cda80e85eca91f71397f3a89fdde [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 8b8caf6347d541fd86dc974cfb4be7d43ee09bb3db9c5c2ba4a8d6c6dbe82581 [INFO] running `Command { std: "docker" "start" "-a" "8b8caf6347d541fd86dc974cfb4be7d43ee09bb3db9c5c2ba4a8d6c6dbe82581", kill_on_drop: false }` [INFO] [stderr] Checking futures-core v0.3.31 [INFO] [stderr] Checking tower-discover v0.3.0 (/opt/rustwide/workdir) [INFO] [stdout] error: this type will no longer be must used: Result, Never> [INFO] [stdout] --> src/list.rs:51:47 [INFO] [stdout] | [INFO] [stdout] 51 | Some((i, service)) => Poll::Ready(Ok(Change::Insert(i, service))), [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: requested on the command line with `-D unmustuse-in-always-ok` [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `tower-discover` (lib test) due to 1 previous error [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stdout] error: this type will no longer be must used: Result, Never> [INFO] [stdout] --> src/list.rs:51:47 [INFO] [stdout] | [INFO] [stdout] 51 | Some((i, service)) => Poll::Ready(Ok(Change::Insert(i, service))), [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: requested on the command line with `-D unmustuse-in-always-ok` [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `tower-discover` (lib) due to 1 previous error [INFO] running `Command { std: "docker" "inspect" "8b8caf6347d541fd86dc974cfb4be7d43ee09bb3db9c5c2ba4a8d6c6dbe82581", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "8b8caf6347d541fd86dc974cfb4be7d43ee09bb3db9c5c2ba4a8d6c6dbe82581", kill_on_drop: false }` [INFO] [stdout] 8b8caf6347d541fd86dc974cfb4be7d43ee09bb3db9c5c2ba4a8d6c6dbe82581