[INFO] cloning repository https://github.com/EricBorges2019/rust_multithread
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/EricBorges2019/rust_multithread" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEricBorges2019%2Frust_multithread", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEricBorges2019%2Frust_multithread'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0e779fb2ccec6489154387cdf34e52740f77c169
[INFO] building EricBorges2019/rust_multithread against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEricBorges2019%2Frust_multithread" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/EricBorges2019/rust_multithread on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/EricBorges2019/rust_multithread
[INFO] finished tweaking git repo https://github.com/EricBorges2019/rust_multithread
[INFO] tweaked toml for git repo https://github.com/EricBorges2019/rust_multithread written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/EricBorges2019/rust_multithread 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" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6fa940e5c39dbe8f5f77ef5df6a699d429566efc4dbbfaae63faf13c68e65c7c
[INFO] running `Command { std: "docker" "start" "-a" "6fa940e5c39dbe8f5f77ef5df6a699d429566efc4dbbfaae63faf13c68e65c7c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6fa940e5c39dbe8f5f77ef5df6a699d429566efc4dbbfaae63faf13c68e65c7c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6fa940e5c39dbe8f5f77ef5df6a699d429566efc4dbbfaae63faf13c68e65c7c", kill_on_drop: false }`
[INFO] [stdout] 6fa940e5c39dbe8f5f77ef5df6a699d429566efc4dbbfaae63faf13c68e65c7c
[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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 349793b710b23bd02612d8e2b3d2a9238d2c2e4ad23a35c7190634dce4107978
[INFO] running `Command { std: "docker" "start" "-a" "349793b710b23bd02612d8e2b3d2a9238d2c2e4ad23a35c7190634dce4107978", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.154
[INFO] [stderr]    Compiling getrandom v0.2.15
[INFO] [stderr]    Compiling num_cpus v1.16.0
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling rust_multithread v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `core_count`
[INFO] [stdout]  --> src/main.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 |    let core_count = num_cpus::get();
[INFO] [stdout]   |        ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_core_count`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.39s
[INFO] running `Command { std: "docker" "inspect" "349793b710b23bd02612d8e2b3d2a9238d2c2e4ad23a35c7190634dce4107978", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "349793b710b23bd02612d8e2b3d2a9238d2c2e4ad23a35c7190634dce4107978", kill_on_drop: false }`
[INFO] [stdout] 349793b710b23bd02612d8e2b3d2a9238d2c2e4ad23a35c7190634dce4107978
[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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bd0d7eb7bd78fc39e1d19fa63784ceb29e8aec24cf03f5040dac95d1918db729
[INFO] running `Command { std: "docker" "start" "-a" "bd0d7eb7bd78fc39e1d19fa63784ceb29e8aec24cf03f5040dac95d1918db729", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_multithread v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `core_count`
[INFO] [stdout]  --> src/main.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 |    let core_count = num_cpus::get();
[INFO] [stdout]   |        ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_core_count`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.16s
[INFO] running `Command { std: "docker" "inspect" "bd0d7eb7bd78fc39e1d19fa63784ceb29e8aec24cf03f5040dac95d1918db729", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd0d7eb7bd78fc39e1d19fa63784ceb29e8aec24cf03f5040dac95d1918db729", kill_on_drop: false }`
[INFO] [stdout] bd0d7eb7bd78fc39e1d19fa63784ceb29e8aec24cf03f5040dac95d1918db729