[INFO] cloning repository https://github.com/joaodelgado/maze
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/joaodelgado/maze" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjoaodelgado%2Fmaze", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjoaodelgado%2Fmaze'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7f04ef49b2e7fc2649303ae3a69c0973dc785a15
[INFO] checking joaodelgado/maze against 1.55.0 for beta-1.56-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjoaodelgado%2Fmaze" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/joaodelgado/maze on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/joaodelgado/maze
[INFO] finished tweaking git repo https://github.com/joaodelgado/maze
[INFO] tweaked toml for git repo https://github.com/joaodelgado/maze written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/joaodelgado/maze already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 31b30416665000460b5d141b015c8b949008ae71214d6b0548005222ec55efc0
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "31b30416665000460b5d141b015c8b949008ae71214d6b0548005222ec55efc0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "31b30416665000460b5d141b015c8b949008ae71214d6b0548005222ec55efc0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "31b30416665000460b5d141b015c8b949008ae71214d6b0548005222ec55efc0", kill_on_drop: false }`
[INFO] [stdout] 31b30416665000460b5d141b015c8b949008ae71214d6b0548005222ec55efc0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "check" "--frozen" "--all" "--all-targets" "--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] 0358dc559f2103a769eca4a207c961754e767760b8d428518184e83ca7f7e37f
[INFO] running `Command { std: "docker" "start" "-a" "0358dc559f2103a769eca4a207c961754e767760b8d428518184e83ca7f7e37f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking downcast-rs v1.1.0
[INFO] [stderr]    Compiling libm v0.1.4
[INFO] [stderr]     Checking xdg v2.1.0
[INFO] [stderr]    Compiling same-file v1.0.5
[INFO] [stderr]    Compiling nix v0.11.1
[INFO] [stderr]     Checking xi-unicode v0.2.0
[INFO] [stderr]     Checking mint v0.5.3
[INFO] [stderr]     Checking claxon v0.4.2
[INFO] [stderr]    Compiling libloading v0.5.2
[INFO] [stderr]    Compiling x11-dl v2.18.4
[INFO] [stderr]    Compiling num-complex v0.2.3
[INFO] [stderr]    Compiling libudev-sys v0.1.4
[INFO] [stderr]    Compiling minimp3-sys v0.3.1
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling bzip2-sys v0.1.6
[INFO] [stderr]    Compiling proc-macro2 v0.3.6
[INFO] [stderr]     Checking inflate v0.4.5
[INFO] [stderr]     Checking gif v0.10.3
[INFO] [stderr]    Compiling serde v1.0.101
[INFO] [stderr]    Compiling bitflags v1.2.0
[INFO] [stderr]     Checking arrayvec v0.4.12
[INFO] [stderr]    Compiling walkdir v2.2.9
[INFO] [stderr]    Compiling ryu v1.0.0
[INFO] [stderr]     Checking draw_state v0.8.0
[INFO] [stderr]     Checking toml v0.5.3
[INFO] [stderr]     Checking rustc-hash v1.0.1
[INFO] [stderr]     Checking deflate v0.7.18
[INFO] [stderr]     Checking ogg v0.7.0
[INFO] [stderr]     Checking jpeg-decoder v0.1.14
[INFO] [stderr]     Checking generic-array v0.12.3
[INFO] [stderr]     Checking approx v0.3.2
[INFO] [stderr]     Checking ordered-float v1.0.2
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking num-integer v0.1.41
[INFO] [stderr]    Compiling xml-rs v0.7.0
[INFO] [stderr]    Compiling pulldown-cmark v0.2.0
[INFO] [stderr]    Compiling quote v0.5.1
[INFO] [stderr]     Checking gfx_core v0.9.2
[INFO] [stderr]     Checking png v0.15.0
[INFO] [stderr]     Checking line_drawing v0.7.0
[INFO] [stderr]     Checking sid v0.5.2
[INFO] [stderr]     Checking lewton v0.9.4
[INFO] [stderr]     Checking num-rational v0.2.2
[INFO] [stderr]     Checking num-iter v0.1.35
[INFO] [stderr]    Compiling syn v0.13.1
[INFO] [stderr]     Checking dlib v0.4.1
[INFO] [stderr]    Compiling backtrace-sys v0.1.31
[INFO] [stderr]    Compiling rand v0.4.2
[INFO] [stderr]     Checking alga v0.9.1
[INFO] [stderr]    Compiling wayland-scanner v0.21.13
[INFO] [stderr]    Compiling backtrace v0.3.38
[INFO] [stderr]     Checking wayland-sys v0.21.13
[INFO] [stderr]     Checking num_cpus v1.8.0
[INFO] [stderr]     Checking nix v0.14.1
[INFO] [stderr]     Checking memmap v0.7.0
[INFO] [stderr]     Checking shared_library v0.1.9
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking slice-deque v0.2.4
[INFO] [stderr]     Checking alsa-sys v0.1.1
[INFO] [stderr]     Checking atty v0.2.8
[INFO] [stderr]     Checking dirs-sys v0.3.4
[INFO] [stderr]    Compiling error-chain v0.12.1
[INFO] [stderr]     Checking osmesa-sys v0.1.2
[INFO] [stderr]    Compiling tempdir v0.3.7
[INFO] [stderr]     Checking clap v2.31.2
[INFO] [stderr]     Checking bzip2 v0.3.2
[INFO] [stderr]     Checking cpal v0.8.2
[INFO] [stderr]     Checking minimp3 v0.3.3
[INFO] [stderr]     Checking twox-hash v1.5.0
[INFO] [stderr]     Checking gfx_device_gl v0.16.2
[INFO] [stderr]     Checking gfx v0.18.2
[INFO] [stderr]     Checking directories v2.0.2
[INFO] [stderr]     Checking zip v0.5.3
[INFO] [stderr]    Compiling wayland-client v0.21.13
[INFO] [stderr]    Compiling wayland-protocols v0.21.13
[INFO] [stderr]     Checking nalgebra v0.18.1
[INFO] [stderr]    Compiling structopt-derive v0.2.7
[INFO] [stderr]     Checking glutin_glx_sys v0.1.5
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling serde_json v1.0.41
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]     Checking gilrs-core v0.2.4
[INFO] [stderr]     Checking structopt v0.2.7
[INFO] [stderr]    Compiling memoffset v0.5.1
[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]     Checking wayland-commons v0.21.13
[INFO] [stderr]     Checking gilrs v0.7.2
[INFO] [stderr]     Checking crossbeam-epoch v0.7.2
[INFO] [stderr]    Compiling cargo_metadata v0.6.4
[INFO] [stderr]     Checking crossbeam-deque v0.7.1
[INFO] [stderr]     Checking rusttype v0.8.1
[INFO] [stderr]    Compiling skeptic v0.13.4
[INFO] [stderr]     Checking rusttype v0.7.9
[INFO] [stderr]     Checking glyph_brush_layout v0.1.8
[INFO] [stderr]    Compiling euclid_macros v0.1.0
[INFO] [stderr]    Compiling num-derive v0.2.5
[INFO] [stderr]    Compiling smart-default v0.5.2
[INFO] [stderr]     Checking andrew v0.2.1
[INFO] [stderr]    Compiling ggez v0.5.1
[INFO] [stderr]     Checking glyph_brush v0.6.0
[INFO] [stderr]     Checking glyph_brush v0.5.4
[INFO] [stderr]     Checking euclid v0.19.9
[INFO] [stderr]     Checking lyon_geom v0.12.7
[INFO] [stderr]     Checking tiff v0.3.1
[INFO] [stderr]     Checking lyon_path v0.13.2
[INFO] [stderr]     Checking lyon_algorithms v0.13.4
[INFO] [stderr]     Checking lyon_tessellation v0.13.5
[INFO] [stderr]     Checking image v0.22.3
[INFO] [stderr]     Checking lyon v0.13.5
[INFO] [stderr]     Checking rodio v0.9.0
[INFO] [stderr]     Checking smithay-client-toolkit v0.4.6
[INFO] [stderr]     Checking winit v0.19.3
[INFO] [stderr]     Checking glutin v0.20.1
[INFO] [stderr]     Checking gfx_window_glutin v0.30.0
[INFO] [stderr]     Checking maze v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(drain_filter)]
[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:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(vec_remove_item)]
[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:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(drain_filter)]
[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:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(vec_remove_item)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `remove_item` found for struct `Vec<Wall>` in the current scope
[INFO] [stdout]    --> src/generator.rs:177:32
[INFO] [stdout]     |
[INFO] [stdout] 177 |                     self.walls.remove_item(&maze.wall(&c, &direction));
[INFO] [stdout]     |                                ^^^^^^^^^^^ method not found in `Vec<Wall>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `remove_item` found for struct `Vec<Wall>` in the current scope
[INFO] [stdout]    --> src/generator.rs:177:32
[INFO] [stdout]     |
[INFO] [stdout] 177 |                     self.walls.remove_item(&maze.wall(&c, &direction));
[INFO] [stdout]     |                                ^^^^^^^^^^^ method not found in `Vec<Wall>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `remove_item` found for mutable reference `&mut Vec<Coord>` in the current scope
[INFO] [stdout]    --> src/generator.rs:358:18
[INFO] [stdout]     |
[INFO] [stdout] 358 |                 .remove_item(&c);
[INFO] [stdout]     |                  ^^^^^^^^^^^ method not found in `&mut Vec<Coord>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `remove_item` found for mutable reference `&mut Vec<Coord>` in the current scope
[INFO] [stdout]    --> src/generator.rs:358:18
[INFO] [stdout]     |
[INFO] [stdout] 358 |                 .remove_item(&c);
[INFO] [stdout]     |                  ^^^^^^^^^^^ method not found in `&mut Vec<Coord>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `maze` due to 5 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "0358dc559f2103a769eca4a207c961754e767760b8d428518184e83ca7f7e37f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0358dc559f2103a769eca4a207c961754e767760b8d428518184e83ca7f7e37f", kill_on_drop: false }`
[INFO] [stdout] 0358dc559f2103a769eca4a207c961754e767760b8d428518184e83ca7f7e37f
