[INFO] fetching crate unsigned-varint 0.8.0...
[INFO] checking unsigned-varint-0.8.0 against master#020bbe46bdf613c0b8211984eaa8e5fe97d6c92d for pr-122960
[INFO] extracting crate unsigned-varint 0.8.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate unsigned-varint 0.8.0 on toolchain 020bbe46bdf613c0b8211984eaa8e5fe97d6c92d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+020bbe46bdf613c0b8211984eaa8e5fe97d6c92d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate unsigned-varint 0.8.0
[INFO] finished tweaking crates.io crate unsigned-varint 0.8.0
[INFO] tweaked toml for crates.io crate unsigned-varint 0.8.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate unsigned-varint 0.8.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+020bbe46bdf613c0b8211984eaa8e5fe97d6c92d" "fetch" "--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]  Downloading crates ...
[INFO] [stderr]   Downloaded backtrace v0.3.69
[INFO] [stderr]   Downloaded futures-core v0.3.29
[INFO] [stderr]   Downloaded bytes v1.5.0
[INFO] [stderr]   Downloaded itoa v1.0.9
[INFO] [stderr]   Downloaded asynchronous-codec v0.7.0
[INFO] [stderr]   Downloaded tokio v1.33.0
[INFO] [stderr]   Downloaded half v1.8.2
[INFO] [stderr]   Downloaded ryu v1.0.15
[INFO] [stderr]   Downloaded serde_derive v1.0.190
[INFO] [stderr]   Downloaded serde v1.0.190
[INFO] [stderr]   Downloaded serde_json v1.0.108
[INFO] [stderr]   Downloaded futures-io v0.3.29
[INFO] [stderr]   Downloaded futures-util v0.3.29
[INFO] [stderr]   Downloaded regex v1.10.2
[INFO] [stderr]   Downloaded futures-executor v0.3.29
[INFO] [stderr]   Downloaded syn v2.0.38
[INFO] [stderr]   Downloaded futures-macro v0.3.29
[INFO] [stderr]   Downloaded futures-task v0.3.29
[INFO] [stderr]   Downloaded env_logger v0.8.4
[INFO] [stderr]   Downloaded getrandom v0.2.10
[INFO] [stderr]   Downloaded quickcheck v1.0.3
[INFO] [stderr]   Downloaded object v0.32.1
[INFO] [stderr]   Downloaded gimli v0.28.0
[INFO] [stderr]   Downloaded futures-sink v0.3.29
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+020bbe46bdf613c0b8211984eaa8e5fe97d6c92d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7fe53009a3699ed8be19bf7b765840b04e5c8b83b9d3ac5effdea4eb0e431bc7
[INFO] running `Command { std: "docker" "start" "-a" "7fe53009a3699ed8be19bf7b765840b04e5c8b83b9d3ac5effdea4eb0e431bc7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7fe53009a3699ed8be19bf7b765840b04e5c8b83b9d3ac5effdea4eb0e431bc7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7fe53009a3699ed8be19bf7b765840b04e5c8b83b9d3ac5effdea4eb0e431bc7", kill_on_drop: false }`
[INFO] [stdout] 7fe53009a3699ed8be19bf7b765840b04e5c8b83b9d3ac5effdea4eb0e431bc7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+020bbe46bdf613c0b8211984eaa8e5fe97d6c92d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 27d5c03eacfaaad3bb54e8b775b5a1dc8a64e03408f5c879bfe7a4107b6fbe12
[INFO] running `Command { std: "docker" "start" "-a" "27d5c03eacfaaad3bb54e8b775b5a1dc8a64e03408f5c879bfe7a4107b6fbe12", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.149
[INFO] [stderr]     Checking memchr v2.6.4
[INFO] [stderr]    Compiling memoffset v0.9.0
[INFO] [stderr]    Compiling serde v1.0.190
[INFO] [stderr]    Compiling crossbeam-utils v0.8.16
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.15
[INFO] [stderr]    Compiling proc-macro2 v1.0.69
[INFO] [stderr]     Checking scopeguard v1.2.0
[INFO] [stderr]    Compiling num-traits v0.2.17
[INFO] [stderr]    Compiling slab v0.4.9
[INFO] [stderr]     Checking itoa v1.0.9
[INFO] [stderr]     Checking either v1.9.0
[INFO] [stderr]    Compiling serde_json v1.0.108
[INFO] [stderr]    Compiling futures-task v0.3.29
[INFO] [stderr]    Compiling futures-core v0.3.29
[INFO] [stderr]    Compiling rayon-core v1.12.0
[INFO] [stderr]     Checking ryu v1.0.15
[INFO] [stderr]    Compiling futures-util v0.3.29
[INFO] [stderr]     Checking itertools v0.10.5
[INFO] [stderr]     Checking pin-project-lite v0.2.13
[INFO] [stderr]     Checking half v1.8.2
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking log v0.4.20
[INFO] [stderr]     Checking walkdir v2.4.0
[INFO] [stderr]     Checking hex v0.4.3
[INFO] [stderr]     Checking unsigned-varint v0.8.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: the item `core` is imported redundantly
[INFO] [stdout]   --> src/decode.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | use core::{self, fmt};
[INFO] [stdout]    |            ^^^^ the item `core` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]   --> src/lib.rs:24:24
[INFO] [stdout]    |
[INFO] [stdout] 24 | #![forbid(unsafe_code, unused_imports, unused_variables)]
[INFO] [stdout]    |                        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `unsigned-varint` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "27d5c03eacfaaad3bb54e8b775b5a1dc8a64e03408f5c879bfe7a4107b6fbe12", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "27d5c03eacfaaad3bb54e8b775b5a1dc8a64e03408f5c879bfe7a4107b6fbe12", kill_on_drop: false }`
[INFO] [stdout] 27d5c03eacfaaad3bb54e8b775b5a1dc8a64e03408f5c879bfe7a4107b6fbe12