[INFO] cloning repository https://github.com/alvaare/ChessTrainer
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/alvaare/ChessTrainer" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falvaare%2FChessTrainer", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falvaare%2FChessTrainer'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3aac5ff0c540a8063110770cc425d3bf183b4900
[INFO] checking alvaare/ChessTrainer/3aac5ff0c540a8063110770cc425d3bf183b4900 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falvaare%2FChessTrainer" "/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/alvaare/ChessTrainer on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/alvaare/ChessTrainer
[INFO] finished tweaking git repo https://github.com/alvaare/ChessTrainer
[INFO] tweaked toml for git repo https://github.com/alvaare/ChessTrainer written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/alvaare/ChessTrainer 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" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 628941f39fefe3465b9edcad608127c1414d1645cef991dda228f90a9fd1ffd4
[INFO] running `Command { std: "docker" "start" "-a" "628941f39fefe3465b9edcad608127c1414d1645cef991dda228f90a9fd1ffd4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "628941f39fefe3465b9edcad608127c1414d1645cef991dda228f90a9fd1ffd4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "628941f39fefe3465b9edcad608127c1414d1645cef991dda228f90a9fd1ffd4", kill_on_drop: false }`
[INFO] [stdout] 628941f39fefe3465b9edcad608127c1414d1645cef991dda228f90a9fd1ffd4
[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" "-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1458953e5cf15d7be8e9e6dbd38cdecf21d6fca7595552e5b5a7a4d6fd8c3137
[INFO] running `Command { std: "docker" "start" "-a" "1458953e5cf15d7be8e9e6dbd38cdecf21d6fca7595552e5b5a7a4d6fd8c3137", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.42
[INFO] [stderr]    Compiling unicode-ident v1.0.2
[INFO] [stderr]    Compiling libc v0.2.127
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling serde_derive v1.0.140
[INFO] [stderr]    Compiling serde v1.0.140
[INFO] [stderr]    Compiling serde_json v1.0.82
[INFO] [stderr]    Compiling quote v1.0.20
[INFO] [stderr]    Compiling syn v1.0.98
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking chess_trainer v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `rand::thread_rng`
[INFO] [stdout]  --> src/game.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use rand::thread_rng;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::seq::SliceRandom`
[INFO] [stdout]  --> src/game.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rand::seq::SliceRandom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::thread_rng`
[INFO] [stdout]  --> src/game.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use rand::thread_rng;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::seq::SliceRandom`
[INFO] [stdout]  --> src/game.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rand::seq::SliceRandom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `piece`
[INFO] [stdout]   --> src/chess_move.rs:50:13
[INFO] [stdout]    |
[INFO] [stdout] 50 |         let piece = Piece {piece_type, color: turn};
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_piece`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Pawn` is never constructed
[INFO] [stdout]   --> src/piece.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct Pawn;
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Knight` is never constructed
[INFO] [stdout]   --> src/piece.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | struct Knight;
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Bishop` is never constructed
[INFO] [stdout]   --> src/piece.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 | struct Bishop;
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rook` is never constructed
[INFO] [stdout]   --> src/piece.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | struct Rook;
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Queen` is never constructed
[INFO] [stdout]   --> src/piece.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | struct Queen;
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `King` is never constructed
[INFO] [stdout]   --> src/piece.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | struct King;
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `CanMove` is never used
[INFO] [stdout]    --> src/piece.rs:104:11
[INFO] [stdout]     |
[INFO] [stdout] 104 | pub trait CanMove {
[INFO] [stdout]     |           ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `PAWN_CAPTURE_DIRS` is never used
[INFO] [stdout]    --> src/piece.rs:108:7
[INFO] [stdout]     |
[INFO] [stdout] 108 | const PAWN_CAPTURE_DIRS: [Coord; 2] = [Coord(0,1), Coord(0,-1)];
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `moves` and `result` are never read
[INFO] [stdout]  --> src/game.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct Game {
[INFO] [stdout]   |            ---- fields in this struct
[INFO] [stdout] 7 |     moves: Vec<ChessMove>,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 8 |     result: Option<Result>
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Game` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/game.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl Game {
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] 12 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `reader` is never read
[INFO] [stdout]  --> src/parser.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Parser {
[INFO] [stdout]   |            ------ field in this struct
[INFO] [stdout] 4 |     reader: BufReader<File>
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 14 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `piece`
[INFO] [stdout]   --> src/chess_move.rs:50:13
[INFO] [stdout]    |
[INFO] [stdout] 50 |         let piece = Piece {piece_type, color: turn};
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_piece`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Pawn` is never constructed
[INFO] [stdout]   --> src/piece.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct Pawn;
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Knight` is never constructed
[INFO] [stdout]   --> src/piece.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | struct Knight;
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Bishop` is never constructed
[INFO] [stdout]   --> src/piece.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 | struct Bishop;
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rook` is never constructed
[INFO] [stdout]   --> src/piece.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | struct Rook;
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Queen` is never constructed
[INFO] [stdout]   --> src/piece.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | struct Queen;
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `King` is never constructed
[INFO] [stdout]   --> src/piece.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | struct King;
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `CanMove` is never used
[INFO] [stdout]    --> src/piece.rs:104:11
[INFO] [stdout]     |
[INFO] [stdout] 104 | pub trait CanMove {
[INFO] [stdout]     |           ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `PAWN_CAPTURE_DIRS` is never used
[INFO] [stdout]    --> src/piece.rs:108:7
[INFO] [stdout]     |
[INFO] [stdout] 108 | const PAWN_CAPTURE_DIRS: [Coord; 2] = [Coord(0,1), Coord(0,-1)];
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `moves` and `result` are never read
[INFO] [stdout]  --> src/game.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct Game {
[INFO] [stdout]   |            ---- fields in this struct
[INFO] [stdout] 7 |     moves: Vec<ChessMove>,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 8 |     result: Option<Result>
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Game` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/game.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl Game {
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] 12 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `reader` is never read
[INFO] [stdout]  --> src/parser.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Parser {
[INFO] [stdout]   |            ------ field in this struct
[INFO] [stdout] 4 |     reader: BufReader<File>
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 14 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `white_opening`
[INFO] [stdout]   --> src/main.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let mut white_opening = OpeningTree::new();
[INFO] [stdout]    |             ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_white_opening`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `parser`
[INFO] [stdout]   --> src/main.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let mut parser = Parser::new("small_chess_database.pgn");
[INFO] [stdout]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_parser`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let mut white_opening = OpeningTree::new();
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let mut parser = Parser::new("small_chess_database.pgn");
[INFO] [stdout]    |         ----^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `white_opening`
[INFO] [stdout]   --> src/main.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let mut white_opening = OpeningTree::new();
[INFO] [stdout]    |             ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_white_opening`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `parser`
[INFO] [stdout]   --> src/main.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let mut parser = Parser::new("small_chess_database.pgn");
[INFO] [stdout]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_parser`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let mut white_opening = OpeningTree::new();
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let mut parser = Parser::new("small_chess_database.pgn");
[INFO] [stdout]    |         ----^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 12.71s
[INFO] running `Command { std: "docker" "inspect" "1458953e5cf15d7be8e9e6dbd38cdecf21d6fca7595552e5b5a7a4d6fd8c3137", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1458953e5cf15d7be8e9e6dbd38cdecf21d6fca7595552e5b5a7a4d6fd8c3137", kill_on_drop: false }`
[INFO] [stdout] 1458953e5cf15d7be8e9e6dbd38cdecf21d6fca7595552e5b5a7a4d6fd8c3137