[INFO] fetching crate pco 0.4.7...
[INFO] checking pco-0.4.7 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate pco 0.4.7 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate pco 0.4.7
[INFO] finished tweaking crates.io crate pco 0.4.7
[INFO] tweaked toml for crates.io crate pco 0.4.7 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate pco 0.4.7 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] crate crates.io crate pco 0.4.7 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] f80012b763103a6d8638cb0d6e912abb1300ea9e96e9dbd9a051a65f6516850e
[INFO] running `Command { std: "docker" "start" "-a" "f80012b763103a6d8638cb0d6e912abb1300ea9e96e9dbd9a051a65f6516850e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f80012b763103a6d8638cb0d6e912abb1300ea9e96e9dbd9a051a65f6516850e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f80012b763103a6d8638cb0d6e912abb1300ea9e96e9dbd9a051a65f6516850e", kill_on_drop: false }`
[INFO] [stdout] f80012b763103a6d8638cb0d6e912abb1300ea9e96e9dbd9a051a65f6516850e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] fc354b10d9a29bb13608dfb419d908d9f97b07933852216bee61eacf6ec6e82a
[INFO] running `Command { std: "docker" "start" "-a" "fc354b10d9a29bb13608dfb419d908d9f97b07933852216bee61eacf6ec6e82a", kill_on_drop: false }`
[INFO] [stderr]    Compiling pco v0.4.7 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking better_io v0.1.0
[INFO] [stderr]     Checking dtype_dispatch v0.1.1
[INFO] [stderr]     Checking half v2.6.0
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand_xoshiro v0.6.0
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/tests/compatibility.rs:11:3
[INFO] [stdout]    |
[INFO] [stdout] 11 |   PathBuf::from_str(env!("CARGO_MANIFEST_DIR"))
[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 `pco` (lib test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "fc354b10d9a29bb13608dfb419d908d9f97b07933852216bee61eacf6ec6e82a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fc354b10d9a29bb13608dfb419d908d9f97b07933852216bee61eacf6ec6e82a", kill_on_drop: false }`
[INFO] [stdout] fc354b10d9a29bb13608dfb419d908d9f97b07933852216bee61eacf6ec6e82a