[INFO] cloning repository https://github.com/aspedrosa/MineSweeper-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/aspedrosa/MineSweeper-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faspedrosa%2FMineSweeper-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faspedrosa%2FMineSweeper-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b5ecbf89cb989bf7f91f79cdd162aa1337a5555d
[INFO] building aspedrosa/MineSweeper-rs 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%2Faspedrosa%2FMineSweeper-rs" "/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/aspedrosa/MineSweeper-rs 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/aspedrosa/MineSweeper-rs
[INFO] finished tweaking git repo https://github.com/aspedrosa/MineSweeper-rs
[INFO] tweaked toml for git repo https://github.com/aspedrosa/MineSweeper-rs written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/aspedrosa/MineSweeper-rs 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] 43ca7f6c868abe1ab652244b6a8e687d57aa5d39c8f61e683c360be85048c225
[INFO] running `Command { std: "docker" "start" "-a" "43ca7f6c868abe1ab652244b6a8e687d57aa5d39c8f61e683c360be85048c225", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "43ca7f6c868abe1ab652244b6a8e687d57aa5d39c8f61e683c360be85048c225", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "43ca7f6c868abe1ab652244b6a8e687d57aa5d39c8f61e683c360be85048c225", kill_on_drop: false }`
[INFO] [stdout] 43ca7f6c868abe1ab652244b6a8e687d57aa5d39c8f61e683c360be85048c225
[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] 8383cf9185baf82c0a098b3fac5476e9790dfcdbeaa3d2bb71bd0e4712f40a5f
[INFO] running `Command { std: "docker" "start" "-a" "8383cf9185baf82c0a098b3fac5476e9790dfcdbeaa3d2bb71bd0e4712f40a5f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.82
[INFO] [stderr]    Compiling getrandom v0.2.2
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling ansi_term v0.12.1
[INFO] [stderr]    Compiling itertools v0.10.0
[INFO] [stderr]    Compiling rand_core v0.6.1
[INFO] [stderr]    Compiling rand_chacha v0.3.0
[INFO] [stderr]    Compiling rand v0.8.3
[INFO] [stderr]    Compiling mineswipper v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `BorrowMut` and `Borrow`
[INFO] [stdout]   --> src/board.rs:11:19
[INFO] [stdout]    |
[INFO] [stdout] 11 | use std::borrow::{Borrow, BorrowMut};
[INFO] [stdout]    |                   ^^^^^^  ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]    --> src/input/plays.rs:104:5
[INFO] [stdout]     |
[INFO] [stdout] 104 |       /// TODO return more specific error
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 105 | /     if inputs.len() != 2 {
[INFO] [stdout] 106 | |         return Err(InvalidPlay {});
[INFO] [stdout] 107 | |     }
[INFO] [stdout]     | |_____- rustdoc does not generate documentation for expressions
[INFO] [stdout]     |
[INFO] [stdout]     = help: use `//` for a plain comment
[INFO] [stdout]     = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]    --> src/input/plays.rs:124:5
[INFO] [stdout]     |
[INFO] [stdout] 124 |       /// TODO return a more specific error
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 125 | /     if inputs.len() != 3 {
[INFO] [stdout] 126 | |         return Err(InvalidPlay {});
[INFO] [stdout] 127 | |     }
[INFO] [stdout]     | |_____- rustdoc does not generate documentation for expressions
[INFO] [stdout]     |
[INFO] [stdout]     = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]    --> src/input/plays.rs:131:5
[INFO] [stdout]     |
[INFO] [stdout] 131 |       /// TODO return a more specific error
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 132 | /     let mode = match inputs[0] {
[INFO] [stdout] 133 | |         "u" => PlayMode::Unmark,
[INFO] [stdout] 134 | |         "m" => PlayMode::Mark,
[INFO] [stdout] 135 | |         "d" => PlayMode::Dig,
[INFO] [stdout] 136 | |         _ => return Err(InvalidPlay {}),
[INFO] [stdout] 137 | |     };
[INFO] [stdout]     | |______- rustdoc does not generate documentation for statements
[INFO] [stdout]     |
[INFO] [stdout]     = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `read_parameters`
[INFO] [stdout]   --> src/main.rs:17:31
[INFO] [stdout]    |
[INFO] [stdout] 17 | use crate::input::arguments::{read_parameters, Parameters};
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/board.rs:254:13
[INFO] [stdout]     |
[INFO] [stdout] 254 |         let mut cell = &mut self.board[play.0 as usize][play.1 as usize];
[INFO] [stdout]     |             ----^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_parameters` is never used
[INFO] [stdout]   --> src/input/arguments.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | pub fn read_parameters() -> Parameters {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `EMPTY_CELLS` should have a snake case name
[INFO] [stdout]    --> src/board.rs:148:13
[INFO] [stdout]     |
[INFO] [stdout] 148 |         let EMPTY_CELLS = 40; // TODO calculate this according to difficulty
[INFO] [stdout]     |             ^^^^^^^^^^^ help: convert the identifier to snake case: `empty_cells`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/input/arguments.rs:50:5
[INFO] [stdout]    |
[INFO] [stdout] 50 |     io::stdout().flush();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 50 |     let _ = io::stdout().flush();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/input/arguments.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 |     io::stdin().read_line(&mut input);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 51 |     let _ = io::stdin().read_line(&mut input);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/input/arguments.rs:58:5
[INFO] [stdout]    |
[INFO] [stdout] 58 |     io::stdout().flush();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let _ = io::stdout().flush();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/input/arguments.rs:60:5
[INFO] [stdout]    |
[INFO] [stdout] 60 |     io::stdin().read_line(&mut input);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 60 |     let _ = io::stdin().read_line(&mut input);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/input/arguments.rs:67:5
[INFO] [stdout]    |
[INFO] [stdout] 67 |     io::stdout().flush();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let _ = io::stdout().flush();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/input/arguments.rs:69:5
[INFO] [stdout]    |
[INFO] [stdout] 69 |     io::stdin().read_line(&mut input);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let _ = io::stdin().read_line(&mut input);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/input/plays.rs:76:5
[INFO] [stdout]    |
[INFO] [stdout] 76 |     io::stdout().flush();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 76 |     let _ = io::stdout().flush();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/input/plays.rs:77:5
[INFO] [stdout]    |
[INFO] [stdout] 77 |     io::stdin().read_line(input);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 77 |     let _ = io::stdin().read_line(input);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.55s
[INFO] running `Command { std: "docker" "inspect" "8383cf9185baf82c0a098b3fac5476e9790dfcdbeaa3d2bb71bd0e4712f40a5f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8383cf9185baf82c0a098b3fac5476e9790dfcdbeaa3d2bb71bd0e4712f40a5f", kill_on_drop: false }`
[INFO] [stdout] 8383cf9185baf82c0a098b3fac5476e9790dfcdbeaa3d2bb71bd0e4712f40a5f
[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] c1e5c1f2c76f297a2996c8f7388efa8636cf667277471e39218902c0cd462c3d
[INFO] running `Command { std: "docker" "start" "-a" "c1e5c1f2c76f297a2996c8f7388efa8636cf667277471e39218902c0cd462c3d", kill_on_drop: false }`
[INFO] [stderr]    Compiling mineswipper v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `BorrowMut` and `Borrow`
[INFO] [stdout]   --> src/board.rs:11:19
[INFO] [stdout]    |
[INFO] [stdout] 11 | use std::borrow::{Borrow, BorrowMut};
[INFO] [stdout]    |                   ^^^^^^  ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]    --> src/input/plays.rs:104:5
[INFO] [stdout]     |
[INFO] [stdout] 104 |       /// TODO return more specific error
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 105 | /     if inputs.len() != 2 {
[INFO] [stdout] 106 | |         return Err(InvalidPlay {});
[INFO] [stdout] 107 | |     }
[INFO] [stdout]     | |_____- rustdoc does not generate documentation for expressions
[INFO] [stdout]     |
[INFO] [stdout]     = help: use `//` for a plain comment
[INFO] [stdout]     = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]    --> src/input/plays.rs:124:5
[INFO] [stdout]     |
[INFO] [stdout] 124 |       /// TODO return a more specific error
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 125 | /     if inputs.len() != 3 {
[INFO] [stdout] 126 | |         return Err(InvalidPlay {});
[INFO] [stdout] 127 | |     }
[INFO] [stdout]     | |_____- rustdoc does not generate documentation for expressions
[INFO] [stdout]     |
[INFO] [stdout]     = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]    --> src/input/plays.rs:131:5
[INFO] [stdout]     |
[INFO] [stdout] 131 |       /// TODO return a more specific error
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 132 | /     let mode = match inputs[0] {
[INFO] [stdout] 133 | |         "u" => PlayMode::Unmark,
[INFO] [stdout] 134 | |         "m" => PlayMode::Mark,
[INFO] [stdout] 135 | |         "d" => PlayMode::Dig,
[INFO] [stdout] 136 | |         _ => return Err(InvalidPlay {}),
[INFO] [stdout] 137 | |     };
[INFO] [stdout]     | |______- rustdoc does not generate documentation for statements
[INFO] [stdout]     |
[INFO] [stdout]     = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `read_parameters`
[INFO] [stdout]   --> src/main.rs:17:31
[INFO] [stdout]    |
[INFO] [stdout] 17 | use crate::input::arguments::{read_parameters, Parameters};
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/board.rs:254:13
[INFO] [stdout]     |
[INFO] [stdout] 254 |         let mut cell = &mut self.board[play.0 as usize][play.1 as usize];
[INFO] [stdout]     |             ----^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_parameters` is never used
[INFO] [stdout]   --> src/input/arguments.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | pub fn read_parameters() -> Parameters {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `EMPTY_CELLS` should have a snake case name
[INFO] [stdout]    --> src/board.rs:148:13
[INFO] [stdout]     |
[INFO] [stdout] 148 |         let EMPTY_CELLS = 40; // TODO calculate this according to difficulty
[INFO] [stdout]     |             ^^^^^^^^^^^ help: convert the identifier to snake case: `empty_cells`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/input/arguments.rs:50:5
[INFO] [stdout]    |
[INFO] [stdout] 50 |     io::stdout().flush();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 50 |     let _ = io::stdout().flush();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/input/arguments.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 |     io::stdin().read_line(&mut input);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 51 |     let _ = io::stdin().read_line(&mut input);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/input/arguments.rs:58:5
[INFO] [stdout]    |
[INFO] [stdout] 58 |     io::stdout().flush();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let _ = io::stdout().flush();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/input/arguments.rs:60:5
[INFO] [stdout]    |
[INFO] [stdout] 60 |     io::stdin().read_line(&mut input);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 60 |     let _ = io::stdin().read_line(&mut input);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/input/arguments.rs:67:5
[INFO] [stdout]    |
[INFO] [stdout] 67 |     io::stdout().flush();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let _ = io::stdout().flush();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/input/arguments.rs:69:5
[INFO] [stdout]    |
[INFO] [stdout] 69 |     io::stdin().read_line(&mut input);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let _ = io::stdin().read_line(&mut input);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/input/plays.rs:76:5
[INFO] [stdout]    |
[INFO] [stdout] 76 |     io::stdout().flush();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 76 |     let _ = io::stdout().flush();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/input/plays.rs:77:5
[INFO] [stdout]    |
[INFO] [stdout] 77 |     io::stdin().read_line(input);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 77 |     let _ = io::stdin().read_line(input);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.16s
[INFO] running `Command { std: "docker" "inspect" "c1e5c1f2c76f297a2996c8f7388efa8636cf667277471e39218902c0cd462c3d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c1e5c1f2c76f297a2996c8f7388efa8636cf667277471e39218902c0cd462c3d", kill_on_drop: false }`
[INFO] [stdout] c1e5c1f2c76f297a2996c8f7388efa8636cf667277471e39218902c0cd462c3d