[INFO] fetching crate once_cell_serde 1.17.1...
[INFO] checking once_cell_serde-1.17.1 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate once_cell_serde 1.17.1 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate once_cell_serde 1.17.1 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 once_cell_serde 1.17.1
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate once_cell_serde 1.17.1
[INFO] tweaked toml for crates.io crate once_cell_serde 1.17.1 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate once_cell_serde 1.17.1 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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded atomic-polyfill v1.0.1
[INFO] [stderr]   Downloaded critical-section v1.1.1
[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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b73b561f3cbf2f737381a4657d7500be927fc62baa942c2d0f00f3c702c2abdb
[INFO] running `Command { std: "docker" "start" "-a" "b73b561f3cbf2f737381a4657d7500be927fc62baa942c2d0f00f3c702c2abdb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b73b561f3cbf2f737381a4657d7500be927fc62baa942c2d0f00f3c702c2abdb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b73b561f3cbf2f737381a4657d7500be927fc62baa942c2d0f00f3c702c2abdb", kill_on_drop: false }`
[INFO] [stdout] b73b561f3cbf2f737381a4657d7500be927fc62baa942c2d0f00f3c702c2abdb
[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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fa7be40e5392d54b3a164cfea9530af2f9c0b17ae55e9638a8cb6f99d6e7c4bb
[INFO] running `Command { std: "docker" "start" "-a" "fa7be40e5392d54b3a164cfea9530af2f9c0b17ae55e9638a8cb6f99d6e7c4bb", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.14
[INFO] [stderr]     Checking critical-section v1.1.1
[INFO] [stderr]     Checking once_cell_serde v1.17.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking regex v1.7.1
[INFO] [stdout] warning: the item `Box` is imported redundantly
[INFO] [stdout]    --> src/race.rs:298:9
[INFO] [stdout]     |
[INFO] [stdout] 298 |     use alloc::boxed::Box;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:144:13
[INFO] [stdout]     |
[INFO] [stdout]     = note: the item `Box` is already defined here
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Box` is imported redundantly
[INFO] [stdout]    --> src/race.rs:298:9
[INFO] [stdout]     |
[INFO] [stdout] 298 |     use alloc::boxed::Box;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:144:13
[INFO] [stdout]     |
[INFO] [stdout]     = note: the item `Box` is already defined here
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` 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 0.72s
[INFO] running `Command { std: "docker" "inspect" "fa7be40e5392d54b3a164cfea9530af2f9c0b17ae55e9638a8cb6f99d6e7c4bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa7be40e5392d54b3a164cfea9530af2f9c0b17ae55e9638a8cb6f99d6e7c4bb", kill_on_drop: false }`
[INFO] [stdout] fa7be40e5392d54b3a164cfea9530af2f9c0b17ae55e9638a8cb6f99d6e7c4bb