[INFO] fetching crate display_tree 1.1.2...
[INFO] checking display_tree-1.1.2 against master#cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c for pr-143170
[INFO] extracting crate display_tree 1.1.2 into /workspace/builds/worker-3-tc1/source
[INFO] started tweaking crates.io crate display_tree 1.1.2
[INFO] finished tweaking crates.io crate display_tree 1.1.2
[INFO] tweaked toml for crates.io crate display_tree 1.1.2 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate display_tree 1.1.2 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]     Updating crates.io index
[INFO] [stderr]      Locking 8 packages to latest compatible versions
[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]  Downloading crates ...
[INFO] [stderr]   Downloaded display_tree_derive v1.0.3
[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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dc3bb98253df642ee7ab0e050d1c5732dd58fec41196e67c1f102b2253d6872f
[INFO] running `Command { std: "docker" "start" "-a" "dc3bb98253df642ee7ab0e050d1c5732dd58fec41196e67c1f102b2253d6872f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dc3bb98253df642ee7ab0e050d1c5732dd58fec41196e67c1f102b2253d6872f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dc3bb98253df642ee7ab0e050d1c5732dd58fec41196e67c1f102b2253d6872f", kill_on_drop: false }`
[INFO] [stdout] dc3bb98253df642ee7ab0e050d1c5732dd58fec41196e67c1f102b2253d6872f
[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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 84f817aac6b3ef94585d33c790e8ed35e6fcefbce4ecb692577c8c3f2ffe982f
[INFO] running `Command { std: "docker" "start" "-a" "84f817aac6b3ef94585d33c790e8ed35e6fcefbce4ecb692577c8c3f2ffe982f", kill_on_drop: false }`
[INFO] [stderr]    Compiling version_check v0.9.5
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling display_tree_derive v1.0.3
[INFO] [stderr]     Checking display_tree v1.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary allocation, use `&` instead
[INFO] [stdout]   --> src/to_display_tree_ref.rs:91:20
[INFO] [stdout]    |
[INFO] [stdout] 91 |         assert_eq!(Box::new(Tree).to_display_tree(), &Tree)
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_allocation)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.54s
[INFO] running `Command { std: "docker" "inspect" "84f817aac6b3ef94585d33c790e8ed35e6fcefbce4ecb692577c8c3f2ffe982f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "84f817aac6b3ef94585d33c790e8ed35e6fcefbce4ecb692577c8c3f2ffe982f", kill_on_drop: false }`
[INFO] [stdout] 84f817aac6b3ef94585d33c790e8ed35e6fcefbce4ecb692577c8c3f2ffe982f