[INFO] cloning repository https://github.com/RobertKuntze/chess-in-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/RobertKuntze/chess-in-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRobertKuntze%2Fchess-in-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRobertKuntze%2Fchess-in-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 36ed59a9788e078c496b5a9d05702322d73d49ec
[INFO] building RobertKuntze/chess-in-rust 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%2FRobertKuntze%2Fchess-in-rust" "/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/RobertKuntze/chess-in-rust 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/RobertKuntze/chess-in-rust
[INFO] finished tweaking git repo https://github.com/RobertKuntze/chess-in-rust
[INFO] tweaked toml for git repo https://github.com/RobertKuntze/chess-in-rust written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/RobertKuntze/chess-in-rust 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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] e114dbb4298e27173a3814970162d5a88e64d0366064e8fe84c7c0bc0ab7cb2a
[INFO] running `Command { std: "docker" "start" "-a" "e114dbb4298e27173a3814970162d5a88e64d0366064e8fe84c7c0bc0ab7cb2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e114dbb4298e27173a3814970162d5a88e64d0366064e8fe84c7c0bc0ab7cb2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e114dbb4298e27173a3814970162d5a88e64d0366064e8fe84c7c0bc0ab7cb2a", kill_on_drop: false }`
[INFO] [stdout] e114dbb4298e27173a3814970162d5a88e64d0366064e8fe84c7c0bc0ab7cb2a
[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] fb0e0c05c59c5c8fc72f957c92fe2327eb61206b3398e1e87927f4371b7a994a
[INFO] running `Command { std: "docker" "start" "-a" "fb0e0c05c59c5c8fc72f957c92fe2327eb61206b3398e1e87927f4371b7a994a", kill_on_drop: false }`
[INFO] [stderr]    Compiling chess-in-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `u8::MAX`
[INFO] [stdout]  --> src/main.rs:1:21
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{cmp, fmt, u8::MAX};
[INFO] [stdout]   |                     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `print_piece` is never used
[INFO] [stdout]    --> src/main.rs:217:8
[INFO] [stdout]     |
[INFO] [stdout] 212 | impl Piece{
[INFO] [stdout]     | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 217 |     fn print_piece(&self) {
[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 0.20s
[INFO] running `Command { std: "docker" "inspect" "fb0e0c05c59c5c8fc72f957c92fe2327eb61206b3398e1e87927f4371b7a994a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb0e0c05c59c5c8fc72f957c92fe2327eb61206b3398e1e87927f4371b7a994a", kill_on_drop: false }`
[INFO] [stdout] fb0e0c05c59c5c8fc72f957c92fe2327eb61206b3398e1e87927f4371b7a994a
[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] 1235c7071cfd9745d043b81150a6c3bf25e3cf47f194277624294585ccbf0a65
[INFO] running `Command { std: "docker" "start" "-a" "1235c7071cfd9745d043b81150a6c3bf25e3cf47f194277624294585ccbf0a65", kill_on_drop: false }`
[INFO] [stderr]    Compiling chess-in-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `u8::MAX`
[INFO] [stdout]  --> src/main.rs:1:21
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{cmp, fmt, u8::MAX};
[INFO] [stdout]   |                     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `print_piece` is never used
[INFO] [stdout]    --> src/main.rs:217:8
[INFO] [stdout]     |
[INFO] [stdout] 212 | impl Piece{
[INFO] [stdout]     | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 217 |     fn print_piece(&self) {
[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 0.14s
[INFO] running `Command { std: "docker" "inspect" "1235c7071cfd9745d043b81150a6c3bf25e3cf47f194277624294585ccbf0a65", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1235c7071cfd9745d043b81150a6c3bf25e3cf47f194277624294585ccbf0a65", kill_on_drop: false }`
[INFO] [stdout] 1235c7071cfd9745d043b81150a6c3bf25e3cf47f194277624294585ccbf0a65