[INFO] cloning repository https://github.com/ArthurKValladares/Solitaire_Solvability
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ArthurKValladares/Solitaire_Solvability" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FArthurKValladares%2FSolitaire_Solvability", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FArthurKValladares%2FSolitaire_Solvability'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 343174069e23fd05f4eae9bb25b45662e21067ca
[INFO] testing ArthurKValladares/Solitaire_Solvability against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FArthurKValladares%2FSolitaire_Solvability" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ArthurKValladares/Solitaire_Solvability on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ArthurKValladares/Solitaire_Solvability
[INFO] finished tweaking git repo https://github.com/ArthurKValladares/Solitaire_Solvability
[INFO] tweaked toml for git repo https://github.com/ArthurKValladares/Solitaire_Solvability written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/ArthurKValladares/Solitaire_Solvability already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded mersenne_twister v1.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 1318ef12b3d7a1f0fbadc034164b261eb82cbbd989b10e2db8d92c3d6fa6890a
[INFO] running `Command { std: "docker" "start" "-a" "1318ef12b3d7a1f0fbadc034164b261eb82cbbd989b10e2db8d92c3d6fa6890a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1318ef12b3d7a1f0fbadc034164b261eb82cbbd989b10e2db8d92c3d6fa6890a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1318ef12b3d7a1f0fbadc034164b261eb82cbbd989b10e2db8d92c3d6fa6890a", kill_on_drop: false }`
[INFO] [stdout] 1318ef12b3d7a1f0fbadc034164b261eb82cbbd989b10e2db8d92c3d6fa6890a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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=warn" "-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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 8695ee33fa7781efb6d5ba24cead173325289360ba6bad3f02f021c336c5e58a
[INFO] running `Command { std: "docker" "start" "-a" "8695ee33fa7781efb6d5ba24cead173325289360ba6bad3f02f021c336c5e58a", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.7
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.7
[INFO] [stderr]    Compiling syn v1.0.86
[INFO] [stderr]    Compiling num_cpus v1.13.1
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling colored v2.0.0
[INFO] [stderr]    Compiling mersenne_twister v1.1.1
[INFO] [stderr]    Compiling crossbeam-channel v0.5.2
[INFO] [stderr]    Compiling crossbeam-deque v0.8.1
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling derivative v2.2.0
[INFO] [stderr]    Compiling solitaire_solvability v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `fmt`
[INFO] [stdout]  --> src/moves.rs:2:33
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::{collections::HashSet, fmt};
[INFO] [stdout]   |                                 ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `timer`
[INFO] [stdout]    --> src/main.rs:396:9
[INFO] [stdout]     |
[INFO] [stdout] 396 |     let timer = Instant::now();
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_timer`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_move_card_to_tableau`
[INFO] [stdout]    --> src/main.rs:201:8
[INFO] [stdout]     |
[INFO] [stdout] 201 |     fn can_move_card_to_tableau(&self, card: Card, tableau_idx: usize) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_draw_from_stock`
[INFO] [stdout]    --> src/main.rs:229:8
[INFO] [stdout]     |
[INFO] [stdout] 229 |     fn can_draw_from_stock(&self, count: usize) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `solvable`
[INFO] [stdout]    --> src/main.rs:391:5
[INFO] [stdout]     |
[INFO] [stdout] 391 |     solvable: bool,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: `GameResult` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    --> src/main.rs:389:10
[INFO] [stdout]     |
[INFO] [stdout] 389 | #[derive(Debug)]
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `seed`
[INFO] [stdout]    --> src/main.rs:392:5
[INFO] [stdout]     |
[INFO] [stdout] 392 |     seed: u32,
[INFO] [stdout]     |     ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: `GameResult` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    --> src/main.rs:389:10
[INFO] [stdout]     |
[INFO] [stdout] 389 | #[derive(Debug)]
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_clubs`
[INFO] [stdout]   --> src/card.rs:42:8
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub fn is_clubs(card: Card) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_spades`
[INFO] [stdout]   --> src/card.rs:54:8
[INFO] [stdout]    |
[INFO] [stdout] 54 | pub fn is_spades(card: Card) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_yellow`
[INFO] [stdout]   --> src/card.rs:62:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | pub fn is_yellow(card: Card) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(int_abs_diff)]
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(int_log)]
[INFO] [stdout]   |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `int_abs_diff` has been stable since 1.60.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(int_abs_diff)]
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `solitaire_solvability` due to 3 previous errors; 10 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "8695ee33fa7781efb6d5ba24cead173325289360ba6bad3f02f021c336c5e58a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8695ee33fa7781efb6d5ba24cead173325289360ba6bad3f02f021c336c5e58a", kill_on_drop: false }`
[INFO] [stdout] 8695ee33fa7781efb6d5ba24cead173325289360ba6bad3f02f021c336c5e58a