[INFO] fetching crate sparse_linear_assignment 0.1.5...
[INFO] checking sparse_linear_assignment-0.1.5 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate sparse_linear_assignment 0.1.5 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate sparse_linear_assignment 0.1.5 on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate sparse_linear_assignment 0.1.5
[INFO] finished tweaking crates.io crate sparse_linear_assignment 0.1.5
[INFO] tweaked toml for crates.io crate sparse_linear_assignment 0.1.5 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 106 packages
[INFO] [stderr]       Adding bitflags v1.3.2 (latest: v2.5.0)
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[INFO] [stderr]       Adding tracing-subscriber v0.2.25 (latest: v0.3.18)
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[INFO] [stderr]       Adding windows-core v0.52.0 (latest: v0.55.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded generic-tests v0.1.2
[INFO] [stderr]   Downloaded reservoir-sampling v0.5.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ca418fefbb942ec444b97f5261b61949d23ff2909d1b511902c07201f2cae4ae
[INFO] running `Command { std: "docker" "start" "-a" "ca418fefbb942ec444b97f5261b61949d23ff2909d1b511902c07201f2cae4ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ca418fefbb942ec444b97f5261b61949d23ff2909d1b511902c07201f2cae4ae", kill_on_drop: false }`
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[INFO] [stdout] ca418fefbb942ec444b97f5261b61949d23ff2909d1b511902c07201f2cae4ae
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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" "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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6a1834c64ec52c2b955871f55da95e053b12de2d3d7cead4805f97640899b866
[INFO] running `Command { std: "docker" "start" "-a" "6a1834c64ec52c2b955871f55da95e053b12de2d3d7cead4805f97640899b866", kill_on_drop: false }`
[INFO] [stderr]    Compiling libm v0.2.8
[INFO] [stderr]    Compiling num-traits v0.2.18
[INFO] [stderr]     Checking tracing-core v0.1.32
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[INFO] [stderr]     Checking sparse_linear_assignment v0.1.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `anyhow` is imported redundantly
[INFO] [stdout]  --> src/ksparse.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use anyhow;
[INFO] [stdout]   |     ^^^^^^ the item `anyhow` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num_iter` is imported redundantly
[INFO] [stdout]  --> src/ksparse.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use num_iter;
[INFO] [stdout]   |     ^^^^^^^^ the item `num_iter` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `anyhow` is imported redundantly
[INFO] [stdout]  --> src/solver.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use anyhow;
[INFO] [stdout]   |     ^^^^^^ the item `anyhow` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num_iter` is imported redundantly
[INFO] [stdout]  --> src/solver.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use num_iter;
[INFO] [stdout]   |     ^^^^^^^^ the item `num_iter` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `anyhow` is imported redundantly
[INFO] [stdout]  --> src/symmetric.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use anyhow;
[INFO] [stdout]   |     ^^^^^^ the item `anyhow` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num_iter` is imported redundantly
[INFO] [stdout]  --> src/symmetric.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use num_iter;
[INFO] [stdout]   |     ^^^^^^^^ the item `num_iter` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `anyhow` is imported redundantly
[INFO] [stdout]  --> src/ksparse.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use anyhow;
[INFO] [stdout]   |     ^^^^^^ the item `anyhow` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num_iter` is imported redundantly
[INFO] [stdout]  --> src/ksparse.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use num_iter;
[INFO] [stdout]   |     ^^^^^^^^ the item `num_iter` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `anyhow` is imported redundantly
[INFO] [stdout]  --> src/solver.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use anyhow;
[INFO] [stdout]   |     ^^^^^^ the item `anyhow` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num_iter` is imported redundantly
[INFO] [stdout]  --> src/solver.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use num_iter;
[INFO] [stdout]   |     ^^^^^^^^ the item `num_iter` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `anyhow` is imported redundantly
[INFO] [stdout]  --> src/symmetric.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use anyhow;
[INFO] [stdout]   |     ^^^^^^ the item `anyhow` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num_iter` is imported redundantly
[INFO] [stdout]  --> src/symmetric.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use num_iter;
[INFO] [stdout]   |     ^^^^^^^^ the item `num_iter` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.10s
[INFO] running `Command { std: "docker" "inspect" "6a1834c64ec52c2b955871f55da95e053b12de2d3d7cead4805f97640899b866", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6a1834c64ec52c2b955871f55da95e053b12de2d3d7cead4805f97640899b866", kill_on_drop: false }`
[INFO] [stdout] 6a1834c64ec52c2b955871f55da95e053b12de2d3d7cead4805f97640899b866