[INFO] fetching crate fend-core 0.1.27...
[INFO] checking fend-core-0.1.27 against master#936f2600b6c903b04387f74ed5cbce88bb06d243 for pr-91141
[INFO] extracting crate fend-core 0.1.27 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate fend-core 0.1.27 on toolchain 936f2600b6c903b04387f74ed5cbce88bb06d243
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate fend-core 0.1.27
[INFO] finished tweaking crates.io crate fend-core 0.1.27
[INFO] tweaked toml for crates.io crate fend-core 0.1.27 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3fe3d9d631396f33093e15b8115d0d9e0fdce9c50e83c06cdb4017a9e1bfd91a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "3fe3d9d631396f33093e15b8115d0d9e0fdce9c50e83c06cdb4017a9e1bfd91a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3fe3d9d631396f33093e15b8115d0d9e0fdce9c50e83c06cdb4017a9e1bfd91a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3fe3d9d631396f33093e15b8115d0d9e0fdce9c50e83c06cdb4017a9e1bfd91a", kill_on_drop: false }`
[INFO] [stdout] 3fe3d9d631396f33093e15b8115d0d9e0fdce9c50e83c06cdb4017a9e1bfd91a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 1fba53a87a51c4f5a92b51af22aad36aa232957e9c6983538b6d39172fa6e08f
[INFO] running `Command { std: "docker" "start" "-a" "1fba53a87a51c4f5a92b51af22aad36aa232957e9c6983538b6d39172fa6e08f", kill_on_drop: false }`
[INFO] [stderr]     Checking fend-core v0.1.27 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `from` that must be used
[INFO] [stdout]     --> src/num/bigrat.rs:1187:9
[INFO] [stdout]      |
[INFO] [stdout] 1187 |         BigRat::from(2);
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `from` that must be used
[INFO] [stdout]     --> src/num/bigrat.rs:1188:9
[INFO] [stdout]      |
[INFO] [stdout] 1188 |         BigRat::from(0);
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `from` that must be used
[INFO] [stdout]     --> src/num/bigrat.rs:1189:9
[INFO] [stdout]      |
[INFO] [stdout] 1189 |         BigRat::from(u64::MAX);
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `from` that must be used
[INFO] [stdout]     --> src/num/bigrat.rs:1190:9
[INFO] [stdout]      |
[INFO] [stdout] 1190 |         BigRat::from(u64::from(u32::MAX));
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.87s
[INFO] running `Command { std: "docker" "inspect" "1fba53a87a51c4f5a92b51af22aad36aa232957e9c6983538b6d39172fa6e08f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1fba53a87a51c4f5a92b51af22aad36aa232957e9c6983538b6d39172fa6e08f", kill_on_drop: false }`
[INFO] [stdout] 1fba53a87a51c4f5a92b51af22aad36aa232957e9c6983538b6d39172fa6e08f