[INFO] fetching crate unifier_set 0.2.0...
[INFO] checking unifier_set-0.2.0 against master#a3f76a26e045a760bb1163b7eab36872985242d5 for pr-130930
[INFO] extracting crate unifier_set 0.2.0 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate unifier_set 0.2.0 on toolchain a3f76a26e045a760bb1163b7eab36872985242d5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a3f76a26e045a760bb1163b7eab36872985242d5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate unifier_set 0.2.0
[INFO] finished tweaking crates.io crate unifier_set 0.2.0
[INFO] tweaked toml for crates.io crate unifier_set 0.2.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a3f76a26e045a760bb1163b7eab36872985242d5" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 4 packages to latest compatible versions
[INFO] [stderr]       Adding archery v0.4.0 (available: v1.2.1)
[INFO] [stderr]       Adding rpds v0.12.0 (available: v1.1.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a3f76a26e045a760bb1163b7eab36872985242d5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded dot_graph v0.2.3
[INFO] [stderr]   Downloaded rpds v0.12.0
[INFO] [stderr]   Downloaded archery v0.4.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+a3f76a26e045a760bb1163b7eab36872985242d5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d3046a46d8527492c47759e4082dff3ec95d3c50f5bbe68e1db9140b2a71fe83
[INFO] running `Command { std: "docker" "start" "-a" "d3046a46d8527492c47759e4082dff3ec95d3c50f5bbe68e1db9140b2a71fe83", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d3046a46d8527492c47759e4082dff3ec95d3c50f5bbe68e1db9140b2a71fe83", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d3046a46d8527492c47759e4082dff3ec95d3c50f5bbe68e1db9140b2a71fe83", kill_on_drop: false }`
[INFO] [stdout] d3046a46d8527492c47759e4082dff3ec95d3c50f5bbe68e1db9140b2a71fe83
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+a3f76a26e045a760bb1163b7eab36872985242d5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ee55e61761b8e8bb3c12cc2d1c8c77de959d4aa855ca4f482e4a13ffce6f3437
[INFO] running `Command { std: "docker" "start" "-a" "ee55e61761b8e8bb3c12cc2d1c8c77de959d4aa855ca4f482e4a13ffce6f3437", kill_on_drop: false }`
[INFO] [stderr]     Checking archery v0.4.0
[INFO] [stderr]     Checking dot_graph v0.2.3
[INFO] [stderr]     Checking rpds v0.12.0
[INFO] [stderr]     Checking unifier_set v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&str` instead of cloning the inner type
[INFO] [stdout]   --> src/unit_tests/mod.rs:58:34
[INFO] [stdout]    |
[INFO] [stdout] 58 |             Pred(h, cs) => Pred(h.clone(), cs.iter().map(f).collect()),
[INFO] [stdout]    |                                  ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.81s
[INFO] running `Command { std: "docker" "inspect" "ee55e61761b8e8bb3c12cc2d1c8c77de959d4aa855ca4f482e4a13ffce6f3437", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ee55e61761b8e8bb3c12cc2d1c8c77de959d4aa855ca4f482e4a13ffce6f3437", kill_on_drop: false }`
[INFO] [stdout] ee55e61761b8e8bb3c12cc2d1c8c77de959d4aa855ca4f482e4a13ffce6f3437