[INFO] cloning repository https://github.com/marnagy/rust-simple-mergesort
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/marnagy/rust-simple-mergesort" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmarnagy%2Frust-simple-mergesort", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmarnagy%2Frust-simple-mergesort'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 49844f027df8a816f554e66106231ee906e99c11
[INFO] building marnagy/rust-simple-mergesort 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%2Fmarnagy%2Frust-simple-mergesort" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/marnagy/rust-simple-mergesort 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/marnagy/rust-simple-mergesort
[INFO] finished tweaking git repo https://github.com/marnagy/rust-simple-mergesort
[INFO] tweaked toml for git repo https://github.com/marnagy/rust-simple-mergesort written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/marnagy/rust-simple-mergesort 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-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] bd0c1b1d3313bbe6af057e9eb8c575a36e2b7666d0e7ec2b4f825132343ea99f
[INFO] running `Command { std: "docker" "start" "-a" "bd0c1b1d3313bbe6af057e9eb8c575a36e2b7666d0e7ec2b4f825132343ea99f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bd0c1b1d3313bbe6af057e9eb8c575a36e2b7666d0e7ec2b4f825132343ea99f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd0c1b1d3313bbe6af057e9eb8c575a36e2b7666d0e7ec2b4f825132343ea99f", kill_on_drop: false }`
[INFO] [stdout] bd0c1b1d3313bbe6af057e9eb8c575a36e2b7666d0e7ec2b4f825132343ea99f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 3b13ff7a1b21fc5ae2dc07b9b6dc0e8cbcdcd892ee09493d97b90bec8c5d948f
[INFO] running `Command { std: "docker" "start" "-a" "3b13ff7a1b21fc5ae2dc07b9b6dc0e8cbcdcd892ee09493d97b90bec8c5d948f", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.8
[INFO] [stderr]    Compiling libc v0.2.125
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.8
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling crossbeam-queue v0.3.5
[INFO] [stderr]    Compiling ppv-lite86 v0.2.16
[INFO] [stderr]    Compiling crossbeam-channel v0.5.4
[INFO] [stderr]    Compiling getrandom v0.2.6
[INFO] [stderr]    Compiling crossbeam-deque v0.8.1
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling crossbeam v0.8.1
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling mergesort v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `merge_sort` is never used
[INFO] [stdout]   --> src/mergesort.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub fn merge_sort<T: Ord + Copy>(arr: &mut Vec<T>){
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.05s
[INFO] running `Command { std: "docker" "inspect" "3b13ff7a1b21fc5ae2dc07b9b6dc0e8cbcdcd892ee09493d97b90bec8c5d948f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b13ff7a1b21fc5ae2dc07b9b6dc0e8cbcdcd892ee09493d97b90bec8c5d948f", kill_on_drop: false }`
[INFO] [stdout] 3b13ff7a1b21fc5ae2dc07b9b6dc0e8cbcdcd892ee09493d97b90bec8c5d948f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] b0fc08d47d342453189611743d2f3dbfa283c9e203be885d97a94f7be503d929
[INFO] running `Command { std: "docker" "start" "-a" "b0fc08d47d342453189611743d2f3dbfa283c9e203be885d97a94f7be503d929", kill_on_drop: false }`
[INFO] [stderr]    Compiling mergesort v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `merge_sort` is never used
[INFO] [stdout]   --> src/mergesort.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub fn merge_sort<T: Ord + Copy>(arr: &mut Vec<T>){
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.23s
[INFO] running `Command { std: "docker" "inspect" "b0fc08d47d342453189611743d2f3dbfa283c9e203be885d97a94f7be503d929", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b0fc08d47d342453189611743d2f3dbfa283c9e203be885d97a94f7be503d929", kill_on_drop: false }`
[INFO] [stdout] b0fc08d47d342453189611743d2f3dbfa283c9e203be885d97a94f7be503d929