[INFO] cloning repository https://github.com/ibabushkin/gabelstaplerwm
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ibabushkin/gabelstaplerwm" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fibabushkin%2Fgabelstaplerwm", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fibabushkin%2Fgabelstaplerwm'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b7950e2443f871cf270c35b8671ce3627790c26c
[INFO] testing ibabushkin/gabelstaplerwm against beta-2021-08-01 for beta-1.55-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fibabushkin%2Fgabelstaplerwm" "/workspace/builds/worker-107/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-107/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ibabushkin/gabelstaplerwm on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ibabushkin/gabelstaplerwm
[INFO] finished tweaking git repo https://github.com/ibabushkin/gabelstaplerwm
[INFO] tweaked toml for git repo https://github.com/ibabushkin/gabelstaplerwm written to /workspace/builds/worker-107/source/Cargo.toml
[INFO] crate git repo https://github.com/ibabushkin/gabelstaplerwm already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde v1.0.90
[INFO] [stderr]   Downloaded generational-arena v0.2.2
[INFO] [stderr]   Downloaded xkb v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-107/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-107/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d836f73a6b207102bc22e200544b8ac2958da2cd40595859414f276a4d068816
[INFO] running `Command { std: "docker" "start" "-a" "d836f73a6b207102bc22e200544b8ac2958da2cd40595859414f276a4d068816", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d836f73a6b207102bc22e200544b8ac2958da2cd40595859414f276a4d068816", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d836f73a6b207102bc22e200544b8ac2958da2cd40595859414f276a4d068816", kill_on_drop: false }`
[INFO] [stdout] d836f73a6b207102bc22e200544b8ac2958da2cd40595859414f276a4d068816
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-107/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-107/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3e21b81deed1f70cca09ca55b632d44bbf186d321adbae10a85f88859aeec495
[INFO] running `Command { std: "docker" "start" "-a" "3e21b81deed1f70cca09ca55b632d44bbf186d321adbae10a85f88859aeec495", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.51
[INFO] [stderr]    Compiling cfg-if v0.1.7
[INFO] [stderr]    Compiling memchr v2.2.0
[INFO] [stderr]    Compiling pkg-config v0.3.14
[INFO] [stderr]    Compiling ucd-util v0.1.3
[INFO] [stderr]    Compiling regex v1.1.6
[INFO] [stderr]    Compiling lazy_static v1.3.0
[INFO] [stderr]    Compiling serde v1.0.90
[INFO] [stderr]    Compiling quick-error v1.2.2
[INFO] [stderr]    Compiling utf8-ranges v1.0.2
[INFO] [stderr]    Compiling bitflags v0.9.1
[INFO] [stderr]    Compiling unicode-width v0.1.5
[INFO] [stderr]    Compiling termcolor v1.0.4
[INFO] [stderr]    Compiling log v0.4.6
[INFO] [stderr]    Compiling generational-arena v0.2.2
[INFO] [stderr]    Compiling humantime v1.2.0
[INFO] [stderr]    Compiling regex-syntax v0.6.6
[INFO] [stderr]    Compiling getopts v0.2.18
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling gwm-core v0.8.0 (/opt/rustwide/workdir/gwm-core)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> gwm-core/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(type_alias_enum_variants)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `type_alias_enum_variants` has been stable since 1.37.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:192:22
[INFO] [stdout]     |
[INFO] [stdout] 192 |     fn render(&self, &TagTree<C>, &Geometry, &mut ClientSizes);
[INFO] [stdout]     |                      ^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &TagTree<C>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(anonymous_parameters)]` on by default
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:192:35
[INFO] [stdout]     |
[INFO] [stdout] 192 |     fn render(&self, &TagTree<C>, &Geometry, &mut ClientSizes);
[INFO] [stdout]     |                                   ^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &Geometry`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:192:46
[INFO] [stdout]     |
[INFO] [stdout] 192 |     fn render(&self, &TagTree<C>, &Geometry, &mut ClientSizes);
[INFO] [stdout]     |                                              ^^^^^^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &mut ClientSizes`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:195:26
[INFO] [stdout]     |
[INFO] [stdout] 195 |     fn check_tree(&self, &TagTree<C>) -> bool;
[INFO] [stdout]     |                          ^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &TagTree<C>`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:198:26
[INFO] [stdout]     |
[INFO] [stdout] 198 |     fn fixup_tree(&self, &mut TagTree<C>);
[INFO] [stdout]     |                          ^^^^^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &mut TagTree<C>`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:204:29
[INFO] [stdout]     |
[INFO] [stdout] 204 |     fn insert_client(&self, &mut TagTree<C>, C) -> bool;
[INFO] [stdout]     |                             ^^^^^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &mut TagTree<C>`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:204:46
[INFO] [stdout]     |
[INFO] [stdout] 204 |     fn insert_client(&self, &mut TagTree<C>, C) -> bool;
[INFO] [stdout]     |                                              ^ help: try naming the parameter or explicitly ignoring it: `_: C`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:211:32
[INFO] [stdout]     |
[INFO] [stdout] 211 |     fn insert_container(&self, &mut TagTree<C>, &TagTree<C>, ContainerId) -> bool;
[INFO] [stdout]     |                                ^^^^^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &mut TagTree<C>`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:211:49
[INFO] [stdout]     |
[INFO] [stdout] 211 |     fn insert_container(&self, &mut TagTree<C>, &TagTree<C>, ContainerId) -> bool;
[INFO] [stdout]     |                                                 ^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &TagTree<C>`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:211:62
[INFO] [stdout]     |
[INFO] [stdout] 211 |     fn insert_container(&self, &mut TagTree<C>, &TagTree<C>, ContainerId) -> bool;
[INFO] [stdout]     |                                                              ^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: ContainerId`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:217:32
[INFO] [stdout]     |
[INFO] [stdout] 217 |     fn delete_container(&self, &mut TagTree<C>, ContainerId) -> bool;
[INFO] [stdout]     |                                ^^^^^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &mut TagTree<C>`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:217:49
[INFO] [stdout]     |
[INFO] [stdout] 217 |     fn delete_container(&self, &mut TagTree<C>, ContainerId) -> bool;
[INFO] [stdout]     |                                                 ^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: ContainerId`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:224:30
[INFO] [stdout]     |
[INFO] [stdout] 224 |     fn find_container(&self, &TagTree<C>, ContainerId, Direction) -> Option<ContainerId>;
[INFO] [stdout]     |                              ^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &TagTree<C>`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:224:43
[INFO] [stdout]     |
[INFO] [stdout] 224 |     fn find_container(&self, &TagTree<C>, ContainerId, Direction) -> Option<ContainerId>;
[INFO] [stdout]     |                                           ^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: ContainerId`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:224:56
[INFO] [stdout]     |
[INFO] [stdout] 224 |     fn find_container(&self, &TagTree<C>, ContainerId, Direction) -> Option<ContainerId>;
[INFO] [stdout]     |                                                        ^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: Direction`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:230:31
[INFO] [stdout]     |
[INFO] [stdout] 230 |     fn swap_containers(&self, &mut TagTree<C>, ContainerId, ContainerId) -> bool;
[INFO] [stdout]     |                               ^^^^^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &mut TagTree<C>`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:230:48
[INFO] [stdout]     |
[INFO] [stdout] 230 |     fn swap_containers(&self, &mut TagTree<C>, ContainerId, ContainerId) -> bool;
[INFO] [stdout]     |                                                ^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: ContainerId`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:230:61
[INFO] [stdout]     |
[INFO] [stdout] 230 |     fn swap_containers(&self, &mut TagTree<C>, ContainerId, ContainerId) -> bool;
[INFO] [stdout]     |                                                             ^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: ContainerId`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:236:30
[INFO] [stdout]     |
[INFO] [stdout] 236 |     fn move_container(&self, &mut TagTree<C>, ContainerId, ContainerId) -> bool;
[INFO] [stdout]     |                              ^^^^^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &mut TagTree<C>`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:236:47
[INFO] [stdout]     |
[INFO] [stdout] 236 |     fn move_container(&self, &mut TagTree<C>, ContainerId, ContainerId) -> bool;
[INFO] [stdout]     |                                               ^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: ContainerId`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:236:60
[INFO] [stdout]     |
[INFO] [stdout] 236 |     fn move_container(&self, &mut TagTree<C>, ContainerId, ContainerId) -> bool;
[INFO] [stdout]     |                                                            ^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: ContainerId`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]    --> gwm-core/src/layout/mod.rs:239:31
[INFO] [stdout]     |
[INFO] [stdout] 239 |     fn process_msg(&mut self, LayoutMessage) -> bool;
[INFO] [stdout]     |                               ^^^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: LayoutMessage`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]     = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> gwm-core/src/tree.rs:46:17
[INFO] [stdout]    |
[INFO] [stdout] 46 |     layout: Box<Layout<C>>,
[INFO] [stdout]    |                 ^^^^^^^^^ help: use `dyn`: `dyn Layout<C>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 23 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 `gwm-core` due to 2 previous errors; 23 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "3e21b81deed1f70cca09ca55b632d44bbf186d321adbae10a85f88859aeec495", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3e21b81deed1f70cca09ca55b632d44bbf186d321adbae10a85f88859aeec495", kill_on_drop: false }`
[INFO] [stdout] 3e21b81deed1f70cca09ca55b632d44bbf186d321adbae10a85f88859aeec495
