[INFO] fetching crate util 0.1.2...
[INFO] checking util-0.1.2 against master#936f2600b6c903b04387f74ed5cbce88bb06d243 for pr-91141
[INFO] extracting crate util 0.1.2 into /workspace/builds/worker-114/source
[INFO] validating manifest of crates.io crate util 0.1.2 on toolchain 936f2600b6c903b04387f74ed5cbce88bb06d243
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate util 0.1.2
[INFO] finished tweaking crates.io crate util 0.1.2
[INFO] tweaked toml for crates.io crate util 0.1.2 written to /workspace/builds/worker-114/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-114/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-114/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a06dc6bfb4a45c42197557cf49682cd5f2c764a73254d1087bf427430b30aa2c
[INFO] running `Command { std: "docker" "start" "-a" "a06dc6bfb4a45c42197557cf49682cd5f2c764a73254d1087bf427430b30aa2c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a06dc6bfb4a45c42197557cf49682cd5f2c764a73254d1087bf427430b30aa2c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a06dc6bfb4a45c42197557cf49682cd5f2c764a73254d1087bf427430b30aa2c", kill_on_drop: false }`
[INFO] [stdout] a06dc6bfb4a45c42197557cf49682cd5f2c764a73254d1087bf427430b30aa2c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-114/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-114/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e2217765ba6c7fa81eace458837f5a61da990343fb2a2d52bf8ebdf60fc2ae76
[INFO] running `Command { std: "docker" "start" "-a" "e2217765ba6c7fa81eace458837f5a61da990343fb2a2d52bf8ebdf60fc2ae76", kill_on_drop: false }`
[INFO] [stderr]     Checking util v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: an associated function with this name may be added to the standard library in the future
[INFO] [stdout]   --> src/lib.rs:54:62
[INFO] [stdout]    |
[INFO] [stdout] 54 |         if k > self.len() { None } else { Some(unsafe { self.split_at_unchecked(k) }) }
[INFO] [stdout]    |                                                              ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unstable_name_collisions)]` on by default
[INFO] [stdout]    = warning: once this associated item is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]    = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]    = help: call with fully qualified syntax `SliceExt::split_at_unchecked(...)` to keep using the current method
[INFO] [stdout]    = help: add `#![feature(slice_split_at_unchecked)]` to the crate attributes to enable `slice::<impl [T]>::split_at_unchecked`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: an associated function with this name may be added to the standard library in the future
[INFO] [stdout]   --> src/lib.rs:54:62
[INFO] [stdout]    |
[INFO] [stdout] 54 |         if k > self.len() { None } else { Some(unsafe { self.split_at_unchecked(k) }) }
[INFO] [stdout]    |                                                              ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unstable_name_collisions)]` on by default
[INFO] [stdout]    = warning: once this associated item is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]    = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]    = help: call with fully qualified syntax `SliceExt::split_at_unchecked(...)` to keep using the current method
[INFO] [stdout]    = help: add `#![feature(slice_split_at_unchecked)]` to the crate attributes to enable `slice::<impl [T]>::split_at_unchecked`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.27s
[INFO] running `Command { std: "docker" "inspect" "e2217765ba6c7fa81eace458837f5a61da990343fb2a2d52bf8ebdf60fc2ae76", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e2217765ba6c7fa81eace458837f5a61da990343fb2a2d52bf8ebdf60fc2ae76", kill_on_drop: false }`
[INFO] [stdout] e2217765ba6c7fa81eace458837f5a61da990343fb2a2d52bf8ebdf60fc2ae76