[INFO] cloning repository https://github.com/atollk/codinggame-labyrinth
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/atollk/codinggame-labyrinth" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fatollk%2Fcodinggame-labyrinth", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fatollk%2Fcodinggame-labyrinth'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f713ad582bb3c1dd5f4e8d323f6515c2828f29a1
[INFO] checking atollk/codinggame-labyrinth against try#7dabc88a3b6768751847baeb49983f31ac5f20e2 for pr-155945
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fatollk%2Fcodinggame-labyrinth" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/atollk/codinggame-labyrinth
[INFO] finished tweaking git repo https://github.com/atollk/codinggame-labyrinth
[INFO] tweaked toml for git repo https://github.com/atollk/codinggame-labyrinth written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/atollk/codinggame-labyrinth on toolchain 7dabc88a3b6768751847baeb49983f31ac5f20e2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7dabc88a3b6768751847baeb49983f31ac5f20e2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/atollk/codinggame-labyrinth 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" "+7dabc88a3b6768751847baeb49983f31ac5f20e2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+7dabc88a3b6768751847baeb49983f31ac5f20e2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0fa52272e02bbcfb818dc64a7273a59d3e81835c41249134c2c9dcf719fcf36f
[INFO] running `Command { std: "docker" "start" "-a" "0fa52272e02bbcfb818dc64a7273a59d3e81835c41249134c2c9dcf719fcf36f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0fa52272e02bbcfb818dc64a7273a59d3e81835c41249134c2c9dcf719fcf36f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0fa52272e02bbcfb818dc64a7273a59d3e81835c41249134c2c9dcf719fcf36f", kill_on_drop: false }`
[INFO] [stdout] 0fa52272e02bbcfb818dc64a7273a59d3e81835c41249134c2c9dcf719fcf36f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+7dabc88a3b6768751847baeb49983f31ac5f20e2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f4425afc4caf3acefa9368df8eb19e5432b0eecca9a729da0b8e6c2a8b1a92b2
[INFO] running `Command { std: "docker" "start" "-a" "f4425afc4caf3acefa9368df8eb19e5432b0eecca9a729da0b8e6c2a8b1a92b2", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]    Compiling getrandom v0.1.15
[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 codinggame v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `rand::seq::SliceRandom`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rand::seq::SliceRandom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::thread_rng`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use rand::thread_rng;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::seq::SliceRandom`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rand::seq::SliceRandom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `thread::current`
[INFO] [stdout]  --> src/main.rs:8:26
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::{cell::RefCell, thread::current};
[INFO] [stdout]   |                          ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::thread_rng`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use rand::thread_rng;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `thread::current`
[INFO] [stdout]  --> src/main.rs:8:26
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::{cell::RefCell, thread::current};
[INFO] [stdout]   |                          ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/main.rs:110:13
[INFO] [stdout]     |
[INFO] [stdout] 110 |             _ => panic!(),
[INFO] [stdout]     |             ^ no value can reach this
[INFO] [stdout]     |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]    --> src/main.rs:110:13
[INFO] [stdout]     |
[INFO] [stdout] 105 |             Tile::Start => 'T',
[INFO] [stdout]     |             ----------- matches some of the same values
[INFO] [stdout] 106 |             Tile::ControlRoom => 'C',
[INFO] [stdout]     |             ----------------- matches some of the same values
[INFO] [stdout] 107 |             Tile::Hollow => '.',
[INFO] [stdout]     |             ------------ matches some of the same values
[INFO] [stdout] 108 |             Tile::Wall => '#',
[INFO] [stdout]     |             ---------- matches some of the same values
[INFO] [stdout] 109 |             Tile::Unknown => '?',
[INFO] [stdout] 110 |             _ => panic!(),
[INFO] [stdout]     |             ^ ...and 1 other patterns collectively make this unreachable
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/main.rs:110:13
[INFO] [stdout]     |
[INFO] [stdout] 110 |             _ => panic!(),
[INFO] [stdout]     |             ^ no value can reach this
[INFO] [stdout]     |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]    --> src/main.rs:110:13
[INFO] [stdout]     |
[INFO] [stdout] 105 |             Tile::Start => 'T',
[INFO] [stdout]     |             ----------- matches some of the same values
[INFO] [stdout] 106 |             Tile::ControlRoom => 'C',
[INFO] [stdout]     |             ----------------- matches some of the same values
[INFO] [stdout] 107 |             Tile::Hollow => '.',
[INFO] [stdout]     |             ------------ matches some of the same values
[INFO] [stdout] 108 |             Tile::Wall => '#',
[INFO] [stdout]     |             ---------- matches some of the same values
[INFO] [stdout] 109 |             Tile::Unknown => '?',
[INFO] [stdout] 110 |             _ => panic!(),
[INFO] [stdout]     |             ^ ...and 1 other patterns collectively make this unreachable
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r`
[INFO] [stdout]    --> src/main.rs:520:5
[INFO] [stdout]     |
[INFO] [stdout] 520 |     r: i32,
[INFO] [stdout]     |     ^ help: if this is intentional, prefix it with an underscore: `_r`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> src/main.rs:521:5
[INFO] [stdout]     |
[INFO] [stdout] 521 |     c: i32,
[INFO] [stdout]     |     ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r`
[INFO] [stdout]    --> src/main.rs:520:5
[INFO] [stdout]     |
[INFO] [stdout] 520 |     r: i32,
[INFO] [stdout]     |     ^ help: if this is intentional, prefix it with an underscore: `_r`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> src/main.rs:521:5
[INFO] [stdout]     |
[INFO] [stdout] 521 |     c: i32,
[INFO] [stdout]     |     ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_n_lines_from_stdin` is never used
[INFO] [stdout]    --> src/main.rs:543:4
[INFO] [stdout]     |
[INFO] [stdout] 543 | fn read_n_lines_from_stdin(n: usize) -> Vec<String> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/main.rs:171:13
[INFO] [stdout]     |
[INFO] [stdout] 171 |     fn iter(&self) -> MapIterator {
[INFO] [stdout]     |             ^^^^^     ^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |             |
[INFO] [stdout]     |             the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 171 |     fn iter(&self) -> MapIterator<'_> {
[INFO] [stdout]     |                                  ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]    --> src/main.rs:443:14
[INFO] [stdout]     |
[INFO] [stdout] 443 |             .into_iter()
[INFO] [stdout]     |              ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this changes meaning in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout]     = note: `#[warn(array_into_iter)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 443 -             .into_iter()
[INFO] [stdout] 443 +             .iter()
[INFO] [stdout]     |
[INFO] [stdout] help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
[INFO] [stdout]     |
[INFO] [stdout] 442 -         let bfs_moves: HashMap<_, _> = Direction::values()
[INFO] [stdout] 443 -             .into_iter()
[INFO] [stdout] 442 +         let bfs_moves: HashMap<_, _> = IntoIterator::into_iter(Direction::values())
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_n_lines_from_stdin` is never used
[INFO] [stdout]    --> src/main.rs:543:4
[INFO] [stdout]     |
[INFO] [stdout] 543 | fn read_n_lines_from_stdin(n: usize) -> Vec<String> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/main.rs:171:13
[INFO] [stdout]     |
[INFO] [stdout] 171 |     fn iter(&self) -> MapIterator {
[INFO] [stdout]     |             ^^^^^     ^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |             |
[INFO] [stdout]     |             the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 171 |     fn iter(&self) -> MapIterator<'_> {
[INFO] [stdout]     |                                  ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]    --> src/main.rs:443:14
[INFO] [stdout]     |
[INFO] [stdout] 443 |             .into_iter()
[INFO] [stdout]     |              ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this changes meaning in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout]     = note: `#[warn(array_into_iter)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 443 -             .into_iter()
[INFO] [stdout] 443 +             .iter()
[INFO] [stdout]     |
[INFO] [stdout] help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
[INFO] [stdout]     |
[INFO] [stdout] 442 -         let bfs_moves: HashMap<_, _> = Direction::values()
[INFO] [stdout] 443 -             .into_iter()
[INFO] [stdout] 442 +         let bfs_moves: HashMap<_, _> = IntoIterator::into_iter(Direction::values())
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.31s
[INFO] running `Command { std: "docker" "inspect" "f4425afc4caf3acefa9368df8eb19e5432b0eecca9a729da0b8e6c2a8b1a92b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f4425afc4caf3acefa9368df8eb19e5432b0eecca9a729da0b8e6c2a8b1a92b2", kill_on_drop: false }`
[INFO] [stdout] f4425afc4caf3acefa9368df8eb19e5432b0eecca9a729da0b8e6c2a8b1a92b2
