[INFO] cloning repository https://github.com/vivlim/egui-glow-multiwin
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/vivlim/egui-glow-multiwin" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvivlim%2Fegui-glow-multiwin", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvivlim%2Fegui-glow-multiwin'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 90761c4c105d6e504a15487fa7f3ca729670ee0c
[INFO] checking vivlim/egui-glow-multiwin against 1.95.0 for pr-155915
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvivlim%2Fegui-glow-multiwin" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/vivlim/egui-glow-multiwin
[INFO] finished tweaking git repo https://github.com/vivlim/egui-glow-multiwin
[INFO] tweaked toml for git repo https://github.com/vivlim/egui-glow-multiwin written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/vivlim/egui-glow-multiwin on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/vivlim/egui-glow-multiwin 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" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 94db09c9ee59c15ae9da66b9b91c6c33d2a8d634ee71f819feddb7d8e84ef394
[INFO] running `Command { std: "docker" "start" "-a" "94db09c9ee59c15ae9da66b9b91c6c33d2a8d634ee71f819feddb7d8e84ef394", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "94db09c9ee59c15ae9da66b9b91c6c33d2a8d634ee71f819feddb7d8e84ef394", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "94db09c9ee59c15ae9da66b9b91c6c33d2a8d634ee71f819feddb7d8e84ef394", kill_on_drop: false }`
[INFO] [stdout] 94db09c9ee59c15ae9da66b9b91c6c33d2a8d634ee71f819feddb7d8e84ef394
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 555df017c213862b465e218b023288d919018ec6cab8a58b9b4af0bb9b8837f6
[INFO] running `Command { std: "docker" "start" "-a" "555df017c213862b465e218b023288d919018ec6cab8a58b9b4af0bb9b8837f6", kill_on_drop: false }`
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[INFO] [stderr]     Checking egui-multiwin v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `platform::run_return::EventLoopExtRunReturn`
[INFO] [stdout]  --> src/multi_window.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     platform::run_return::EventLoopExtRunReturn,
[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: `MultiWindow`
[INFO] [stdout]  --> src/tracked_window.rs:4:20
[INFO] [stdout]   |
[INFO] [stdout] 4 |     multi_window::{MultiWindow, NewWindowRequest},
[INFO] [stdout]   |                    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::MultiWindow`
[INFO] [stdout]  --> src/windows/mod.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::MultiWindow;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `event_loop::ControlFlow`
[INFO] [stdout]  --> src/windows/mod.rs:4:14
[INFO] [stdout]   |
[INFO] [stdout] 4 | use glutin::{event_loop::ControlFlow, PossiblyCurrent};
[INFO] [stdout]   |              ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::Arc`
[INFO] [stdout]  --> src/windows/mod.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::sync::Arc;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `DisplayCreationError`, `MultiWindow`, and `TrackedWindowContainer`
[INFO] [stdout]  --> src/windows/popup_window.rs:2:20
[INFO] [stdout]   |
[INFO] [stdout] 2 |     multi_window::{MultiWindow, NewWindowRequest},
[INFO] [stdout]   |                    ^^^^^^^^^^^
[INFO] [stdout] 3 |     tracked_window::{
[INFO] [stdout] 4 |         DisplayCreationError, TrackedWindow, TrackedWindowContainer, TrackedWindowControl,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^                 ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::MultiWindow`
[INFO] [stdout]  --> src/windows/root.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::MultiWindow;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `DisplayCreationError` and `TrackedWindowContainer`
[INFO] [stdout]  --> src/windows/root.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |         DisplayCreationError, TrackedWindow, TrackedWindowContainer, TrackedWindowControl,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^                 ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `glutin::event_loop::EventLoop::<T>::with_user_event`: Use `EventLoopBuilder::<T>::with_user_event().build()` instead.
[INFO] [stdout]   --> src/main.rs:17:57
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let mut event_loop = glutin::event_loop::EventLoop::with_user_event();
[INFO] [stdout]    |                                                         ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/multi_window.rs:95:25
[INFO] [stdout]    |
[INFO] [stdout] 94 | ...   ControlFlow::ExitWithCode(n) => (),
[INFO] [stdout]    |       ---------------------------- matches all the relevant values
[INFO] [stdout] 95 | ...   ControlFlow::Exit => (), // handle differently, only exit if all windows are gone?? what do about a closed root window
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^^^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `platform::run_return::EventLoopExtRunReturn`
[INFO] [stdout]  --> src/multi_window.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     platform::run_return::EventLoopExtRunReturn,
[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: `MultiWindow`
[INFO] [stdout]  --> src/tracked_window.rs:4:20
[INFO] [stdout]   |
[INFO] [stdout] 4 |     multi_window::{MultiWindow, NewWindowRequest},
[INFO] [stdout]   |                    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::MultiWindow`
[INFO] [stdout]  --> src/windows/mod.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::MultiWindow;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `event_loop::ControlFlow`
[INFO] [stdout]  --> src/windows/mod.rs:4:14
[INFO] [stdout]   |
[INFO] [stdout] 4 | use glutin::{event_loop::ControlFlow, PossiblyCurrent};
[INFO] [stdout]   |              ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::Arc`
[INFO] [stdout]  --> src/windows/mod.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::sync::Arc;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `DisplayCreationError`, `MultiWindow`, and `TrackedWindowContainer`
[INFO] [stdout]  --> src/windows/popup_window.rs:2:20
[INFO] [stdout]   |
[INFO] [stdout] 2 |     multi_window::{MultiWindow, NewWindowRequest},
[INFO] [stdout]   |                    ^^^^^^^^^^^
[INFO] [stdout] 3 |     tracked_window::{
[INFO] [stdout] 4 |         DisplayCreationError, TrackedWindow, TrackedWindowContainer, TrackedWindowControl,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^                 ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::MultiWindow`
[INFO] [stdout]  --> src/windows/root.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::MultiWindow;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `DisplayCreationError` and `TrackedWindowContainer`
[INFO] [stdout]  --> src/windows/root.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |         DisplayCreationError, TrackedWindow, TrackedWindowContainer, TrackedWindowControl,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^                 ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> src/multi_window.rs:94:51
[INFO] [stdout]    |
[INFO] [stdout] 94 |                         ControlFlow::ExitWithCode(n) => (),
[INFO] [stdout]    |                                                   ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/tracked_window.rs:122:13
[INFO] [stdout]     |
[INFO] [stdout] 122 |             _ => {
[INFO] [stdout]     |             ^ no value can reach this
[INFO] [stdout]     |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]    --> src/tracked_window.rs:122:13
[INFO] [stdout]     |
[INFO] [stdout] 108 |             None => {
[INFO] [stdout]     |             ---- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 121 |             Some(_) => (),
[INFO] [stdout]     |             ------- matches some of the same values
[INFO] [stdout] 122 |             _ => {
[INFO] [stdout]     |             ^ collectively making this unreachable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/windows/root.rs:51:13
[INFO] [stdout]    |
[INFO] [stdout] 51 |         let mut redraw = || {
[INFO] [stdout]    |             ----^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let mut event_loop = glutin::event_loop::EventLoop::with_user_event();
[INFO] [stdout]    |         ----^^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     multi_window.add(root_window, &event_loop);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let _ = multi_window.add(root_window, &event_loop);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     multi_window.add(root_window2, &event_loop);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let _ = multi_window.add(root_window2, &event_loop);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/multi_window.rs:57:25
[INFO] [stdout]    |
[INFO] [stdout] 57 |                         multi_window.add(new_window_request, event_loop_window_target);
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 57 |                         let _ = multi_window.add(new_window_request, event_loop_window_target);
[INFO] [stdout]    |                         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `glutin::event_loop::EventLoop::<T>::with_user_event`: Use `EventLoopBuilder::<T>::with_user_event().build()` instead.
[INFO] [stdout]   --> src/main.rs:17:57
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let mut event_loop = glutin::event_loop::EventLoop::with_user_event();
[INFO] [stdout]    |                                                         ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/multi_window.rs:95:25
[INFO] [stdout]    |
[INFO] [stdout] 94 | ...   ControlFlow::ExitWithCode(n) => (),
[INFO] [stdout]    |       ---------------------------- matches all the relevant values
[INFO] [stdout] 95 | ...   ControlFlow::Exit => (), // handle differently, only exit if all windows are gone?? what do about a closed root window
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^^^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> src/multi_window.rs:94:51
[INFO] [stdout]    |
[INFO] [stdout] 94 |                         ControlFlow::ExitWithCode(n) => (),
[INFO] [stdout]    |                                                   ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/tracked_window.rs:122:13
[INFO] [stdout]     |
[INFO] [stdout] 122 |             _ => {
[INFO] [stdout]     |             ^ no value can reach this
[INFO] [stdout]     |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]    --> src/tracked_window.rs:122:13
[INFO] [stdout]     |
[INFO] [stdout] 108 |             None => {
[INFO] [stdout]     |             ---- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 121 |             Some(_) => (),
[INFO] [stdout]     |             ------- matches some of the same values
[INFO] [stdout] 122 |             _ => {
[INFO] [stdout]     |             ^ collectively making this unreachable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/windows/root.rs:51:13
[INFO] [stdout]    |
[INFO] [stdout] 51 |         let mut redraw = || {
[INFO] [stdout]    |             ----^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let mut event_loop = glutin::event_loop::EventLoop::with_user_event();
[INFO] [stdout]    |         ----^^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     multi_window.add(root_window, &event_loop);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let _ = multi_window.add(root_window, &event_loop);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     multi_window.add(root_window2, &event_loop);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let _ = multi_window.add(root_window2, &event_loop);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/multi_window.rs:57:25
[INFO] [stdout]    |
[INFO] [stdout] 57 |                         multi_window.add(new_window_request, event_loop_window_target);
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 57 |                         let _ = multi_window.add(new_window_request, event_loop_window_target);
[INFO] [stdout]    |                         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1m 07s
[INFO] running `Command { std: "docker" "inspect" "555df017c213862b465e218b023288d919018ec6cab8a58b9b4af0bb9b8837f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "555df017c213862b465e218b023288d919018ec6cab8a58b9b4af0bb9b8837f6", kill_on_drop: false }`
[INFO] [stdout] 555df017c213862b465e218b023288d919018ec6cab8a58b9b4af0bb9b8837f6
