[INFO] fetching crate core_extensions 1.4.1...
[INFO] checking core_extensions-1.4.1 against try#ddfd70ee3c3748e597b32f416b0d15a4f6e37685 for pr-87050
[INFO] extracting crate core_extensions 1.4.1 into /workspace/builds/worker-11/source
[INFO] validating manifest of crates.io crate core_extensions 1.4.1 on toolchain ddfd70ee3c3748e597b32f416b0d15a4f6e37685
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "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-11/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "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-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c23cd3264027ecdbe9cb3b5dc9ba9fc8744d22bc3c784a24b7d3e4c400ddded0
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "c23cd3264027ecdbe9cb3b5dc9ba9fc8744d22bc3c784a24b7d3e4c400ddded0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c23cd3264027ecdbe9cb3b5dc9ba9fc8744d22bc3c784a24b7d3e4c400ddded0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c23cd3264027ecdbe9cb3b5dc9ba9fc8744d22bc3c784a24b7d3e4c400ddded0", kill_on_drop: false }`
[INFO] [stdout] c23cd3264027ecdbe9cb3b5dc9ba9fc8744d22bc3c784a24b7d3e4c400ddded0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 611488fd88dd3f9d12c9ac84475f9a4dc7c30cc3e2dd43b2f46c8319a4c2ee05
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "611488fd88dd3f9d12c9ac84475f9a4dc7c30cc3e2dd43b2f46c8319a4c2ee05", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]     Checking core_extensions v1.4.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking rand v0.4.6
[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] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.79s
[INFO] running `Command { std: "docker" "inspect" "611488fd88dd3f9d12c9ac84475f9a4dc7c30cc3e2dd43b2f46c8319a4c2ee05", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "611488fd88dd3f9d12c9ac84475f9a4dc7c30cc3e2dd43b2f46c8319a4c2ee05", kill_on_drop: false }`
[INFO] [stdout] 611488fd88dd3f9d12c9ac84475f9a4dc7c30cc3e2dd43b2f46c8319a4c2ee05