[INFO] fetching crate core_extensions 1.4.1...
[INFO] checking core_extensions-1.4.1 against try#39e1293fce4b650061e85dda88aa428f726a8444 for pr-88041
[INFO] extracting crate core_extensions 1.4.1 into /workspace/builds/worker-101/source
[INFO] validating manifest of crates.io crate core_extensions 1.4.1 on toolchain 39e1293fce4b650061e85dda88aa428f726a8444
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39e1293fce4b650061e85dda88aa428f726a8444" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate core_extensions 1.4.1
[INFO] finished tweaking crates.io crate core_extensions 1.4.1
[INFO] tweaked toml for crates.io crate core_extensions 1.4.1 written to /workspace/builds/worker-101/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39e1293fce4b650061e85dda88aa428f726a8444" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39e1293fce4b650061e85dda88aa428f726a8444" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded core_extensions_proc_macros v1.4.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+39e1293fce4b650061e85dda88aa428f726a8444" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1deac2d9e5e2c716b9a9fbf0a825f19fd7259efdff90a54991b9657feeb24bd4
[INFO] running `Command { std: "docker" "start" "-a" "1deac2d9e5e2c716b9a9fbf0a825f19fd7259efdff90a54991b9657feeb24bd4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1deac2d9e5e2c716b9a9fbf0a825f19fd7259efdff90a54991b9657feeb24bd4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1deac2d9e5e2c716b9a9fbf0a825f19fd7259efdff90a54991b9657feeb24bd4", kill_on_drop: false }`
[INFO] [stdout] 1deac2d9e5e2c716b9a9fbf0a825f19fd7259efdff90a54991b9657feeb24bd4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+39e1293fce4b650061e85dda88aa428f726a8444" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a4951269e96cb6321020d8d9c43bd4a8bdc2773fae59b122596b40c19cfde75d
[INFO] running `Command { std: "docker" "start" "-a" "a4951269e96cb6321020d8d9c43bd4a8bdc2773fae59b122596b40c19cfde75d", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.99
[INFO] [stderr]     Checking core_extensions v1.4.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.21s
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src_core_extensions/test_utils.rs:53:12
[INFO] [stdout]    |
[INFO] [stdout] 53 |     pub fn new(max: usize) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `clone_count`
[INFO] [stdout]   --> src_core_extensions/test_utils.rs:61:12
[INFO] [stdout]    |
[INFO] [stdout] 61 |     pub fn clone_count(&self) -> usize {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `drop_count`
[INFO] [stdout]   --> src_core_extensions/test_utils.rs:65:12
[INFO] [stdout]    |
[INFO] [stdout] 65 |     pub fn drop_count(&self) -> usize {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "a4951269e96cb6321020d8d9c43bd4a8bdc2773fae59b122596b40c19cfde75d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a4951269e96cb6321020d8d9c43bd4a8bdc2773fae59b122596b40c19cfde75d", kill_on_drop: false }`
[INFO] [stdout] a4951269e96cb6321020d8d9c43bd4a8bdc2773fae59b122596b40c19cfde75d