[INFO] fetching crate unifier_set 0.2.0...
[INFO] checking unifier_set-0.2.0 against master#cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c for pr-143170
[INFO] extracting crate unifier_set 0.2.0 into /workspace/builds/worker-5-tc1/source
[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-5-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate unifier_set 0.2.0 on toolchain cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "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]      Locking 4 packages to latest compatible versions
[INFO] [stderr]       Adding rpds v0.12.0 (available: v1.1.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded archery v0.4.0
[INFO] [stderr]   Downloaded dot_graph v0.2.3
[INFO] [stderr]   Downloaded rpds v0.12.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a933905e9cb28e109743ee485e91322c9558a009af473b69ae536a97e2c1e964
[INFO] running `Command { std: "docker" "start" "-a" "a933905e9cb28e109743ee485e91322c9558a009af473b69ae536a97e2c1e964", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a933905e9cb28e109743ee485e91322c9558a009af473b69ae536a97e2c1e964", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a933905e9cb28e109743ee485e91322c9558a009af473b69ae536a97e2c1e964", kill_on_drop: false }`
[INFO] [stdout] a933905e9cb28e109743ee485e91322c9558a009af473b69ae536a97e2c1e964
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a435ac1cb04fdd19f74a3f4878d188fedab0ea4cce29aace3d25a05f608d7798
[INFO] running `Command { std: "docker" "start" "-a" "a435ac1cb04fdd19f74a3f4878d188fedab0ea4cce29aace3d25a05f608d7798", kill_on_drop: false }`
[INFO] [stderr]     Checking static_assertions v1.1.0
[INFO] [stderr]     Checking dot_graph v0.2.3
[INFO] [stderr]     Checking archery v0.4.0
[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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.00s
[INFO] running `Command { std: "docker" "inspect" "a435ac1cb04fdd19f74a3f4878d188fedab0ea4cce29aace3d25a05f608d7798", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a435ac1cb04fdd19f74a3f4878d188fedab0ea4cce29aace3d25a05f608d7798", kill_on_drop: false }`
[INFO] [stdout] a435ac1cb04fdd19f74a3f4878d188fedab0ea4cce29aace3d25a05f608d7798