[INFO] cloning repository https://github.com/JohnEllefson/Card-Memory-Game
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/JohnEllefson/Card-Memory-Game" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJohnEllefson%2FCard-Memory-Game", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJohnEllefson%2FCard-Memory-Game'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 72ea96e07d92baffb656aa9e136690837e072f94
[INFO] building JohnEllefson/Card-Memory-Game 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%2FJohnEllefson%2FCard-Memory-Game" "/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/JohnEllefson/Card-Memory-Game 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/JohnEllefson/Card-Memory-Game
[INFO] finished tweaking git repo https://github.com/JohnEllefson/Card-Memory-Game
[INFO] tweaked toml for git repo https://github.com/JohnEllefson/Card-Memory-Game written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/JohnEllefson/Card-Memory-Game 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] bb6b9a71e152b813b5e9f06e56d6d639e4a3a2db516266180c8cdf0c92ebe40d
[INFO] running `Command { std: "docker" "start" "-a" "bb6b9a71e152b813b5e9f06e56d6d639e4a3a2db516266180c8cdf0c92ebe40d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bb6b9a71e152b813b5e9f06e56d6d639e4a3a2db516266180c8cdf0c92ebe40d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb6b9a71e152b813b5e9f06e56d6d639e4a3a2db516266180c8cdf0c92ebe40d", kill_on_drop: false }`
[INFO] [stdout] bb6b9a71e152b813b5e9f06e56d6d639e4a3a2db516266180c8cdf0c92ebe40d
[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] 4b223f6ebff7a99c3aa9057ad9d485eb6c6999a50cd569574a88bb68bb9ac983
[INFO] running `Command { std: "docker" "start" "-a" "4b223f6ebff7a99c3aa9057ad9d485eb6c6999a50cd569574a88bb68bb9ac983", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.140
[INFO] [stderr]    Compiling getrandom v0.2.8
[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 memory_game v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `chosen_coord` is never read
[INFO] [stdout]    --> src/main.rs:155:13
[INFO] [stdout]     |
[INFO] [stdout] 155 |     let mut chosen_coord = Coordinate::default();
[INFO] [stdout]     |             ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/main.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 36 | impl Card { 
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 45 |     fn new(symbol_param: char) -> Card {
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]    --> src/main.rs:214:8
[INFO] [stdout]     |
[INFO] [stdout] 214 |     if coord.x < 0 || coord.x > 3 || coord.y < 0 || coord.y > 3 { return false; }
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]    --> src/main.rs:214:38
[INFO] [stdout]     |
[INFO] [stdout] 214 |     if coord.x < 0 || coord.x > 3 || coord.y < 0 || coord.y > 3 { return false; }
[INFO] [stdout]     |                                      ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.02s
[INFO] running `Command { std: "docker" "inspect" "4b223f6ebff7a99c3aa9057ad9d485eb6c6999a50cd569574a88bb68bb9ac983", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4b223f6ebff7a99c3aa9057ad9d485eb6c6999a50cd569574a88bb68bb9ac983", kill_on_drop: false }`
[INFO] [stdout] 4b223f6ebff7a99c3aa9057ad9d485eb6c6999a50cd569574a88bb68bb9ac983
[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] 268d7fe4945cbd505ac679359b78651936e69c2a7a8bfa103feb6b58b811f1bc
[INFO] running `Command { std: "docker" "start" "-a" "268d7fe4945cbd505ac679359b78651936e69c2a7a8bfa103feb6b58b811f1bc", kill_on_drop: false }`
[INFO] [stderr]    Compiling memory_game v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `chosen_coord` is never read
[INFO] [stdout]    --> src/main.rs:155:13
[INFO] [stdout]     |
[INFO] [stdout] 155 |     let mut chosen_coord = Coordinate::default();
[INFO] [stdout]     |             ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/main.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 36 | impl Card { 
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 45 |     fn new(symbol_param: char) -> Card {
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]    --> src/main.rs:214:8
[INFO] [stdout]     |
[INFO] [stdout] 214 |     if coord.x < 0 || coord.x > 3 || coord.y < 0 || coord.y > 3 { return false; }
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]    --> src/main.rs:214:38
[INFO] [stdout]     |
[INFO] [stdout] 214 |     if coord.x < 0 || coord.x > 3 || coord.y < 0 || coord.y > 3 { return false; }
[INFO] [stdout]     |                                      ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.12s
[INFO] running `Command { std: "docker" "inspect" "268d7fe4945cbd505ac679359b78651936e69c2a7a8bfa103feb6b58b811f1bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "268d7fe4945cbd505ac679359b78651936e69c2a7a8bfa103feb6b58b811f1bc", kill_on_drop: false }`
[INFO] [stdout] 268d7fe4945cbd505ac679359b78651936e69c2a7a8bfa103feb6b58b811f1bc