[INFO] fetching crate rusty-chess 0.1.0...
[INFO] checking rusty-chess-0.1.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate rusty-chess 0.1.0 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate rusty-chess 0.1.0 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rusty-chess 0.1.0
[INFO] finished tweaking crates.io crate rusty-chess 0.1.0
[INFO] tweaked toml for crates.io crate rusty-chess 0.1.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate crates.io crate rusty-chess 0.1.0 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: only one of `license` or `license-file` is necessary
[INFO] [stderr] `license` should be used if the package license can be expressed with a standard SPDX expression.
[INFO] [stderr] `license-file` should be used if the package uses a non-standard license.
[INFO] [stderr] See https://doc.rust-lang.org/cargo/reference/manifest.html#the-license-and-license-file-fields for more information.
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ba331b5b46d478aa029ada870468a43e6195580197902fcd136631e6b80f85a5
[INFO] running `Command { std: "docker" "start" "-a" "ba331b5b46d478aa029ada870468a43e6195580197902fcd136631e6b80f85a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ba331b5b46d478aa029ada870468a43e6195580197902fcd136631e6b80f85a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ba331b5b46d478aa029ada870468a43e6195580197902fcd136631e6b80f85a5", kill_on_drop: false }`
[INFO] [stdout] ba331b5b46d478aa029ada870468a43e6195580197902fcd136631e6b80f85a5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3a70f9590891c49ef4d03660a891d00bffcc44e58e742178b913f666bd09b9cc
[INFO] running `Command { std: "docker" "start" "-a" "3a70f9590891c49ef4d03660a891d00bffcc44e58e742178b913f666bd09b9cc", kill_on_drop: false }`
[INFO] [stderr] warning: only one of `license` or `license-file` is necessary
[INFO] [stderr] `license` should be used if the package license can be expressed with a standard SPDX expression.
[INFO] [stderr] `license-file` should be used if the package uses a non-standard license.
[INFO] [stderr] See https://doc.rust-lang.org/cargo/reference/manifest.html#the-license-and-license-file-fields for more information.
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking regex v1.5.5
[INFO] [stderr]     Checking rusty-chess v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `HashSet`
[INFO] [stdout]  --> src/main.rs:1:33
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::{HashMap, HashSet};
[INFO] [stdout]   |                                 ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `HashSet`
[INFO] [stdout]  --> src/main.rs:1:33
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::{HashMap, HashSet};
[INFO] [stdout]   |                                 ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `color`
[INFO] [stdout]    --> src/main.rs:244:54
[INFO] [stdout]     |
[INFO] [stdout] 244 | fn obstacles_in_one_move(pos: Position, game: &Game, color: &Color) -> Option<Obstacle> {
[INFO] [stdout]     |                                                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_color`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `piece`
[INFO] [stdout]    --> src/main.rs:293:21
[INFO] [stdout]     |
[INFO] [stdout] 293 |                 let piece = game.board[&(x, y)].as_ref().unwrap();
[INFO] [stdout]     |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_piece`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `color`
[INFO] [stdout]    --> src/main.rs:244:54
[INFO] [stdout]     |
[INFO] [stdout] 244 | fn obstacles_in_one_move(pos: Position, game: &Game, color: &Color) -> Option<Obstacle> {
[INFO] [stdout]     |                                                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_color`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `piece`
[INFO] [stdout]    --> src/main.rs:293:21
[INFO] [stdout]     |
[INFO] [stdout] 293 |                 let piece = game.board[&(x, y)].as_ref().unwrap();
[INFO] [stdout]     |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_piece`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `p2num` is never used
[INFO] [stdout]    --> src/main.rs:226:4
[INFO] [stdout]     |
[INFO] [stdout] 226 | fn p2num(pos: Position) -> (u8, u8) {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `in_board_boundary` is never used
[INFO] [stdout]    --> src/main.rs:230:4
[INFO] [stdout]     |
[INFO] [stdout] 230 | fn in_board_boundary(pos: Position, game: &Game) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `p2num` is never used
[INFO] [stdout]    --> src/main.rs:226:4
[INFO] [stdout]     |
[INFO] [stdout] 226 | fn p2num(pos: Position) -> (u8, u8) {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `in_board_boundary` is never used
[INFO] [stdout]    --> src/main.rs:230:4
[INFO] [stdout]     |
[INFO] [stdout] 230 | fn in_board_boundary(pos: Position, game: &Game) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.25s
[INFO] running `Command { std: "docker" "inspect" "3a70f9590891c49ef4d03660a891d00bffcc44e58e742178b913f666bd09b9cc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3a70f9590891c49ef4d03660a891d00bffcc44e58e742178b913f666bd09b9cc", kill_on_drop: false }`
[INFO] [stdout] 3a70f9590891c49ef4d03660a891d00bffcc44e58e742178b913f666bd09b9cc