[INFO] fetching crate ftp_core_bindings_pyo3 0.1.796...
[INFO] checking ftp_core_bindings_pyo3-0.1.796 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate ftp_core_bindings_pyo3 0.1.796 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate ftp_core_bindings_pyo3 0.1.796
[INFO] finished tweaking crates.io crate ftp_core_bindings_pyo3 0.1.796
[INFO] tweaked toml for crates.io crate ftp_core_bindings_pyo3 0.1.796 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate ftp_core_bindings_pyo3 0.1.796 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 ftp_core_bindings_pyo3 0.1.796 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] [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-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 8c5f885f197c71ba97a4bf6e9c75dfe671b7575708cf26b5692b1319bf3842be
[INFO] running `Command { std: "docker" "start" "-a" "8c5f885f197c71ba97a4bf6e9c75dfe671b7575708cf26b5692b1319bf3842be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8c5f885f197c71ba97a4bf6e9c75dfe671b7575708cf26b5692b1319bf3842be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c5f885f197c71ba97a4bf6e9c75dfe671b7575708cf26b5692b1319bf3842be", kill_on_drop: false }`
[INFO] [stdout] 8c5f885f197c71ba97a4bf6e9c75dfe671b7575708cf26b5692b1319bf3842be
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 771016c7f3331a33ae52272515a2de2b2f3d9a88583b5130b2da163d188404cb
[INFO] running `Command { std: "docker" "start" "-a" "771016c7f3331a33ae52272515a2de2b2f3d9a88583b5130b2da163d188404cb", kill_on_drop: false }`
[INFO] [stderr]    Compiling target-lexicon v0.13.3
[INFO] [stderr]    Compiling proc-macro2 v1.0.101
[INFO] [stderr]     Checking rawpointer v0.2.1
[INFO] [stderr]     Checking unindent v0.2.4
[INFO] [stderr]    Compiling indoc v2.0.6
[INFO] [stderr]    Compiling matrixmultiply v0.3.10
[INFO] [stderr]     Checking num-complex v0.4.6
[INFO] [stderr]     Checking num-integer v0.1.46
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]    Compiling pyo3-build-config v0.26.0
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]     Checking ndarray v0.16.1
[INFO] [stderr]    Compiling pyo3-ffi v0.26.0
[INFO] [stderr]    Compiling pyo3-macros-backend v0.26.0
[INFO] [stderr]    Compiling pyo3 v0.26.0
[INFO] [stderr]     Checking ftp_core v0.1.796
[INFO] [stderr]    Compiling pyo3-macros v0.26.0
[INFO] [stderr]     Checking ftp_core_bindings_pyo3 v0.1.796 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<i32, Infallible>
[INFO] [stdout]   --> src/lib.rs:29:27
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn add(a: i32, b: i32) -> i32 {
[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 `ftp_core_bindings_pyo3` (lib) 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<i32, Infallible>
[INFO] [stdout]   --> src/lib.rs:29:27
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn add(a: i32, b: i32) -> i32 {
[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 `ftp_core_bindings_pyo3` (lib test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "771016c7f3331a33ae52272515a2de2b2f3d9a88583b5130b2da163d188404cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "771016c7f3331a33ae52272515a2de2b2f3d9a88583b5130b2da163d188404cb", kill_on_drop: false }`
[INFO] [stdout] 771016c7f3331a33ae52272515a2de2b2f3d9a88583b5130b2da163d188404cb