[INFO] updating cached repository https://github.com/grovesNL/gfx-hal-tutorial
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6de6fc0c6c2344200c7add72e9955219b68a5b26
[INFO] checking grovesNL/gfx-hal-tutorial against master#fe6d05a8b32f5c66c427ca524dbcce5a7145f87e for pr-64327
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2FgrovesNL%2Fgfx-hal-tutorial" "work/builds/worker-5/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/grovesNL/gfx-hal-tutorial on toolchain fe6d05a8b32f5c66c427ca524dbcce5a7145f87e-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+fe6d05a8b32f5c66c427ca524dbcce5a7145f87e-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/grovesNL/gfx-hal-tutorial
[INFO] finished tweaking git repo https://github.com/grovesNL/gfx-hal-tutorial
[INFO] tweaked toml for git repo https://github.com/grovesNL/gfx-hal-tutorial written to work/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/grovesNL/gfx-hal-tutorial already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+fe6d05a8b32f5c66c427ca524dbcce5a7145f87e-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-5/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+fe6d05a8b32f5c66c427ca524dbcce5a7145f87e-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] c91cc97970e816d1ed4983852ab124b67cd0068b19c54ec4c7be04913835bee2
[INFO] running `"docker" "start" "-a" "c91cc97970e816d1ed4983852ab124b67cd0068b19c54ec4c7be04913835bee2"`
[INFO] [stderr]    Compiling digest v0.7.6
[INFO] [stderr]     Checking tempfile v3.0.5
[INFO] [stderr]     Checking gfx-hal v0.1.0 (https://github.com/gfx-rs/gfx#d38c2e4a)
[INFO] [stderr]     Checking smithay-client-toolkit v0.4.4
[INFO] [stderr]    Compiling sha2 v0.7.1
[INFO] [stderr]    Compiling glsl-to-spirv v0.1.7
[INFO] [stderr]     Checking winit v0.18.0
[INFO] [stderr] warning[E0713]: borrow may still be in use when destructor runs
[INFO] [stderr]    --> /opt/rustwide/cargo-home/git/checkouts/gfx-e86e7f3ebdbc4218/d38c2e4/src/hal/src/command/render_pass.rs:272:36
[INFO] [stderr]     |
[INFO] [stderr] 229 | impl<'a, B: Backend> RenderPassInlineEncoder<'a, B> {
[INFO] [stderr]     |      -- lifetime `'a` defined here
[INFO] [stderr] ...
[INFO] [stderr] 272 |         RenderPassSecondaryEncoder(self.0.cmb)
[INFO] [stderr]     |         ---------------------------^^^^^^^^^^- returning this value requires that `*self.0.cmb` is borrowed for `'a`
[INFO] [stderr] 273 |     }
[INFO] [stderr]     |     - here, drop of `self` needs exclusive access to `*self.0.cmb`, because the type `command::render_pass::RenderPassInlineEncoder<'_, B>` implements the `Drop` trait
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
[INFO] [stderr]     = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
[INFO] [stderr]     = note: for more information, try `rustc --explain E0729`
[INFO] [stderr] 
[INFO] [stderr] warning[E0713]: borrow may still be in use when destructor runs
[INFO] [stderr]    --> /opt/rustwide/cargo-home/git/checkouts/gfx-e86e7f3ebdbc4218/d38c2e4/src/hal/src/command/render_pass.rs:347:62
[INFO] [stderr]     |
[INFO] [stderr] 303 | impl<'a, B: Backend> RenderPassSecondaryEncoder<'a, B> {
[INFO] [stderr]     |      -- lifetime `'a` defined here
[INFO] [stderr] ...
[INFO] [stderr] 347 |             RenderPassInlineEncoder(RenderSubpassCommon::new(self.0))
[INFO] [stderr]     |             -------------------------------------------------^^^^^^-- returning this value requires that `*self.0` is borrowed for `'a`
[INFO] [stderr] 348 |         }
[INFO] [stderr] 349 |     }
[INFO] [stderr]     |     - here, drop of `self` needs exclusive access to `*self.0`, because the type `command::render_pass::RenderPassSecondaryEncoder<'_, B>` implements the `Drop` trait
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
[INFO] [stderr]     = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
[INFO] [stderr]     = note: for more information, try `rustc --explain E0729`
[INFO] [stderr] 
[INFO] [stderr]     Checking gfx-hal-tutorial v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/07_image_views.rs:35:10
[INFO] [stderr]    |
[INFO] [stderr] 35 |         <back::Backend as Backend>::Image,
[INFO] [stderr]    |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/07_image_views.rs:36:10
[INFO] [stderr]    |
[INFO] [stderr] 36 |         <back::Backend as Backend>::ImageView,
[INFO] [stderr]    |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/07_image_views.rs:39:17
[INFO] [stderr]    |
[INFO] [stderr] 39 |     swapchain: <back::Backend as Backend>::Swapchain,
[INFO] [stderr]    |                 ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/07_image_views.rs:40:46
[INFO] [stderr]    |
[INFO] [stderr] 40 |     _command_queues: Vec<queue::CommandQueue<back::Backend, Graphics>>,
[INFO] [stderr]    |                                              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/07_image_views.rs:41:14
[INFO] [stderr]    |
[INFO] [stderr] 41 |     device: <back::Backend as Backend>::Device,
[INFO] [stderr]    |              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/07_image_views.rs:42:16
[INFO] [stderr]    |
[INFO] [stderr] 42 |     _surface: <back::Backend as Backend>::Surface,
[INFO] [stderr]    |                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/07_image_views.rs:43:23
[INFO] [stderr]    |
[INFO] [stderr] 43 |     _adapter: Adapter<back::Backend>,
[INFO] [stderr]    |                       ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/07_image_views.rs:44:16
[INFO] [stderr]    |
[INFO] [stderr] 44 |     _instance: back::Instance,
[INFO] [stderr]    |                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:121:29
[INFO] [stderr]     |
[INFO] [stderr] 121 |     fn create_instance() -> back::Instance {
[INFO] [stderr]     |                             ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:122:9
[INFO] [stderr]     |
[INFO] [stderr] 122 |         back::Instance::create(WINDOW_NAME, 1)
[INFO] [stderr]     |         ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:125:46
[INFO] [stderr]     |
[INFO] [stderr] 125 |     fn find_queue_families(adapter: &Adapter<back::Backend>) -> QueueFamilyIds {
[INFO] [stderr]     |                                              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:141:46
[INFO] [stderr]     |
[INFO] [stderr] 141 |     fn is_adapter_suitable(adapter: &Adapter<back::Backend>) -> bool {
[INFO] [stderr]     |                                              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:145:32
[INFO] [stderr]     |
[INFO] [stderr] 145 |     fn pick_adapter(instance: &back::Instance) -> Adapter<back::Backend> {
[INFO] [stderr]     |                                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:145:59
[INFO] [stderr]     |
[INFO] [stderr] 145 |     fn pick_adapter(instance: &back::Instance) -> Adapter<back::Backend> {
[INFO] [stderr]     |                                                           ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:156:20
[INFO] [stderr]     |
[INFO] [stderr] 156 |         instance: &back::Instance,
[INFO] [stderr]     |                    ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:158:11
[INFO] [stderr]     |
[INFO] [stderr] 158 |     ) -> <back::Backend as Backend>::Surface {
[INFO] [stderr]     |           ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:163:31
[INFO] [stderr]     |
[INFO] [stderr] 163 |         adapter: &mut Adapter<back::Backend>,
[INFO] [stderr]     |                               ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:164:20
[INFO] [stderr]     |
[INFO] [stderr] 164 |         surface: &<back::Backend as Backend>::Surface,
[INFO] [stderr]     |                    ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:166:10
[INFO] [stderr]     |
[INFO] [stderr] 166 |         <back::Backend as Backend>::Device,
[INFO] [stderr]     |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:167:33
[INFO] [stderr]     |
[INFO] [stderr] 167 |         Vec<queue::CommandQueue<back::Backend, Graphics>>,
[INFO] [stderr]     |                                 ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:199:27
[INFO] [stderr]     |
[INFO] [stderr] 199 |         adapter: &Adapter<back::Backend>,
[INFO] [stderr]     |                           ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:200:19
[INFO] [stderr]     |
[INFO] [stderr] 200 |         device: &<back::Backend as Backend>::Device,
[INFO] [stderr]     |                   ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:201:24
[INFO] [stderr]     |
[INFO] [stderr] 201 |         surface: &mut <back::Backend as Backend>::Surface,
[INFO] [stderr]     |                        ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:202:37
[INFO] [stderr]     |
[INFO] [stderr] 202 |         previous_swapchain: Option<<back::Backend as Backend>::Swapchain>,
[INFO] [stderr]     |                                     ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:204:10
[INFO] [stderr]     |
[INFO] [stderr] 204 |         <back::Backend as Backend>::Swapchain,
[INFO] [stderr]     |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:205:20
[INFO] [stderr]     |
[INFO] [stderr] 205 |         Backbuffer<back::Backend>,
[INFO] [stderr]     |                    ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:231:32
[INFO] [stderr]     |
[INFO] [stderr] 231 |         backbuffer: Backbuffer<back::Backend>,
[INFO] [stderr]     |                                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:233:19
[INFO] [stderr]     |
[INFO] [stderr] 233 |         device: &<back::Backend as Backend>::Device,
[INFO] [stderr]     |                   ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:235:10
[INFO] [stderr]     |
[INFO] [stderr] 235 |         <back::Backend as Backend>::Image,
[INFO] [stderr]     |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/07_image_views.rs:236:10
[INFO] [stderr]     |
[INFO] [stderr] 236 |         <back::Backend as Backend>::ImageView,
[INFO] [stderr]     |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/01_instance_creation.rs:26:16
[INFO] [stderr]    |
[INFO] [stderr] 26 |     _instance: back::Instance,
[INFO] [stderr]    |                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/01_instance_creation.rs:68:29
[INFO] [stderr]    |
[INFO] [stderr] 68 |     fn create_instance() -> back::Instance {
[INFO] [stderr]    |                             ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/01_instance_creation.rs:69:9
[INFO] [stderr]    |
[INFO] [stderr] 69 |         back::Instance::create(WINDOW_NAME, 1)
[INFO] [stderr]    |         ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:35:10
[INFO] [stderr]    |
[INFO] [stderr] 35 |         <back::Backend as Backend>::Image,
[INFO] [stderr]    |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:36:10
[INFO] [stderr]    |
[INFO] [stderr] 36 |         <back::Backend as Backend>::ImageView,
[INFO] [stderr]    |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:39:17
[INFO] [stderr]    |
[INFO] [stderr] 39 |     swapchain: <back::Backend as Backend>::Swapchain,
[INFO] [stderr]    |                 ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:40:46
[INFO] [stderr]    |
[INFO] [stderr] 40 |     _command_queues: Vec<queue::CommandQueue<back::Backend, Graphics>>,
[INFO] [stderr]    |                                              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:41:14
[INFO] [stderr]    |
[INFO] [stderr] 41 |     device: <back::Backend as Backend>::Device,
[INFO] [stderr]    |              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:42:16
[INFO] [stderr]    |
[INFO] [stderr] 42 |     _surface: <back::Backend as Backend>::Surface,
[INFO] [stderr]    |                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:43:23
[INFO] [stderr]    |
[INFO] [stderr] 43 |     _adapter: Adapter<back::Backend>,
[INFO] [stderr]    |                       ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:44:16
[INFO] [stderr]    |
[INFO] [stderr] 44 |     _instance: back::Instance,
[INFO] [stderr]    |                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:121:29
[INFO] [stderr]     |
[INFO] [stderr] 121 |     fn create_instance() -> back::Instance {
[INFO] [stderr]     |                             ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:122:9
[INFO] [stderr]     |
[INFO] [stderr] 122 |         back::Instance::create(WINDOW_NAME, 1)
[INFO] [stderr]     |         ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:125:46
[INFO] [stderr]     |
[INFO] [stderr] 125 |     fn find_queue_families(adapter: &Adapter<back::Backend>) -> QueueFamilyIds {
[INFO] [stderr]     |                                              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:141:46
[INFO] [stderr]     |
[INFO] [stderr] 141 |     fn is_adapter_suitable(adapter: &Adapter<back::Backend>) -> bool {
[INFO] [stderr]     |                                              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:145:32
[INFO] [stderr]     |
[INFO] [stderr] 145 |     fn pick_adapter(instance: &back::Instance) -> Adapter<back::Backend> {
[INFO] [stderr]     |                                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:145:59
[INFO] [stderr]     |
[INFO] [stderr] 145 |     fn pick_adapter(instance: &back::Instance) -> Adapter<back::Backend> {
[INFO] [stderr]     |                                                           ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:156:20
[INFO] [stderr]     |
[INFO] [stderr] 156 |         instance: &back::Instance,
[INFO] [stderr]     |                    ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:158:11
[INFO] [stderr]     |
[INFO] [stderr] 158 |     ) -> <back::Backend as Backend>::Surface {
[INFO] [stderr]     |           ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:163:31
[INFO] [stderr]     |
[INFO] [stderr] 163 |         adapter: &mut Adapter<back::Backend>,
[INFO] [stderr]     |                               ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:164:20
[INFO] [stderr]     |
[INFO] [stderr] 164 |         surface: &<back::Backend as Backend>::Surface,
[INFO] [stderr]     |                    ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:166:10
[INFO] [stderr]     |
[INFO] [stderr] 166 |         <back::Backend as Backend>::Device,
[INFO] [stderr]     |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:167:33
[INFO] [stderr]     |
[INFO] [stderr] 167 |         Vec<queue::CommandQueue<back::Backend, Graphics>>,
[INFO] [stderr]     |                                 ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:199:27
[INFO] [stderr]     |
[INFO] [stderr] 199 |         adapter: &Adapter<back::Backend>,
[INFO] [stderr]     |                           ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:200:19
[INFO] [stderr]     |
[INFO] [stderr] 200 |         device: &<back::Backend as Backend>::Device,
[INFO] [stderr]     |                   ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:201:24
[INFO] [stderr]     |
[INFO] [stderr] 201 |         surface: &mut <back::Backend as Backend>::Surface,
[INFO] [stderr]     |                        ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:202:37
[INFO] [stderr]     |
[INFO] [stderr] 202 |         previous_swapchain: Option<<back::Backend as Backend>::Swapchain>,
[INFO] [stderr]     |                                     ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:204:10
[INFO] [stderr]     |
[INFO] [stderr] 204 |         <back::Backend as Backend>::Swapchain,
[INFO] [stderr]     |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:205:20
[INFO] [stderr]     |
[INFO] [stderr] 205 |         Backbuffer<back::Backend>,
[INFO] [stderr]     |                    ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:231:32
[INFO] [stderr]     |
[INFO] [stderr] 231 |         backbuffer: Backbuffer<back::Backend>,
[INFO] [stderr]     |                                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:233:19
[INFO] [stderr]     |
[INFO] [stderr] 233 |         device: &<back::Backend as Backend>::Device,
[INFO] [stderr]     |                   ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:235:10
[INFO] [stderr]     |
[INFO] [stderr] 235 |         <back::Backend as Backend>::Image,
[INFO] [stderr]     |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:236:10
[INFO] [stderr]     |
[INFO] [stderr] 236 |         <back::Backend as Backend>::ImageView,
[INFO] [stderr]     |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0433`.
[INFO] [stderr] error: Could not compile `gfx-hal-tutorial`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/06_swap_chain_creation.rs:34:17
[INFO] [stderr]    |
[INFO] [stderr] 34 |     swapchain: <back::Backend as Backend>::Swapchain,
[INFO] [stderr]    |                 ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/06_swap_chain_creation.rs:35:46
[INFO] [stderr]    |
[INFO] [stderr] 35 |     _command_queues: Vec<queue::CommandQueue<back::Backend, Graphics>>,
[INFO] [stderr]    |                                              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/06_swap_chain_creation.rs:36:14
[INFO] [stderr]    |
[INFO] [stderr] 36 |     device: <back::Backend as Backend>::Device,
[INFO] [stderr]    |              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/06_swap_chain_creation.rs:37:16
[INFO] [stderr]    |
[INFO] [stderr] 37 |     _surface: <back::Backend as Backend>::Surface,
[INFO] [stderr]    |                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/06_swap_chain_creation.rs:38:23
[INFO] [stderr]    |
[INFO] [stderr] 38 |     _adapter: Adapter<back::Backend>,
[INFO] [stderr]    |                       ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/06_swap_chain_creation.rs:39:16
[INFO] [stderr]    |
[INFO] [stderr] 39 |     _instance: back::Instance,
[INFO] [stderr]    |                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/06_swap_chain_creation.rs:106:29
[INFO] [stderr]     |
[INFO] [stderr] 106 |     fn create_instance() -> back::Instance {
[INFO] [stderr]     |                             ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/06_swap_chain_creation.rs:107:9
[INFO] [stderr]     |
[INFO] [stderr] 107 |         back::Instance::create(WINDOW_NAME, 1)
[INFO] [stderr]     |         ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/06_swap_chain_creation.rs:110:46
[INFO] [stderr]     |
[INFO] [stderr] 110 |     fn find_queue_families(adapter: &Adapter<back::Backend>) -> QueueFamilyIds {
[INFO] [stderr]     |                                              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/06_swap_chain_creation.rs:126:46
[INFO] [stderr]     |
[INFO] [stderr] 126 |     fn is_adapter_suitable(adapter: &Adapter<back::Backend>) -> bool {
[INFO] [stderr]     |                                              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/06_swap_chain_creation.rs:130:32
[INFO] [stderr]     |
[INFO] [stderr] 130 |     fn pick_adapter(instance: &back::Instance) -> Adapter<back::Backend> {
[INFO] [stderr]     |                                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/06_swap_chain_creation.rs:130:59
[INFO] [stderr]     |
[INFO] [stderr] 130 |     fn pick_adapter(instance: &back::Instance) -> Adapter<back::Backend> {
[INFO] [stderr]     |                                                           ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/06_swap_chain_creation.rs:141:20
[INFO] [stderr]     |
[INFO] [stderr] 141 |         instance: &back::Instance,
[INFO] [stderr]     |                    ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/06_swap_chain_creation.rs:143:11
[INFO] [stderr]     |
[INFO] [stderr] 143 |     ) -> <back::Backend as Backend>::Surface {
[INFO] [stderr]     |           ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/06_swap_chain_creation.rs:148:31
[INFO] [stderr]     |
[INFO] [stderr] 148 |         adapter: &mut Adapter<back::Backend>,
[INFO] [stderr]     |                               ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/06_swap_chain_creation.rs:149:20
[INFO] [stderr]     |
[INFO] [stderr] 149 |         surface: &<back::Backend as Backend>::Surface,
[INFO] [stderr]     |                    ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/06_swap_chain_creation.rs:151:10
[INFO] [stderr]     |
[INFO] [stderr] 151 |         <back::Backend as Backend>::Device,
[INFO] [stderr]     |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/06_swap_chain_creation.rs:152:33
[INFO] [stderr]     |
[INFO] [stderr] 152 |         Vec<queue::CommandQueue<back::Backend, Graphics>>,
[INFO] [stderr]     |                                 ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/06_swap_chain_creation.rs:184:27
[INFO] [stderr]     |
[INFO] [stderr] 184 |         adapter: &Adapter<back::Backend>,
[INFO] [stderr]     |                           ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/06_swap_chain_creation.rs:185:19
[INFO] [stderr]     |
[INFO] [stderr] 185 |         device: &<back::Backend as Backend>::Device,
[INFO] [stderr]     |                   ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/06_swap_chain_creation.rs:186:24
[INFO] [stderr]     |
[INFO] [stderr] 186 |         surface: &mut <back::Backend as Backend>::Surface,
[INFO] [stderr]     |                        ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/06_swap_chain_creation.rs:187:37
[INFO] [stderr]     |
[INFO] [stderr] 187 |         previous_swapchain: Option<<back::Backend as Backend>::Swapchain>,
[INFO] [stderr]     |                                     ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/06_swap_chain_creation.rs:189:10
[INFO] [stderr]     |
[INFO] [stderr] 189 |         <back::Backend as Backend>::Swapchain,
[INFO] [stderr]     |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/06_swap_chain_creation.rs:190:20
[INFO] [stderr]     |
[INFO] [stderr] 190 |         Backbuffer<back::Backend>,
[INFO] [stderr]     |                    ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Device`
[INFO] [stderr]   --> src/07_image_views.rs:12:77
[INFO] [stderr]    |
[INFO] [stderr] 12 |     format, image, queue, window, Adapter, Backbuffer, Backend, Capability, Device, Features, Gpu,
[INFO] [stderr]    |                                                                             ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Instance`
[INFO] [stderr]   --> src/07_image_views.rs:13:15
[INFO] [stderr]    |
[INFO] [stderr] 13 |     Graphics, Instance, PhysicalDevice, QueueFamily, Surface, SwapchainConfig,
[INFO] [stderr]    |               ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `PhysicalDevice`
[INFO] [stderr]   --> src/07_image_views.rs:13:25
[INFO] [stderr]    |
[INFO] [stderr] 13 |     Graphics, Instance, PhysicalDevice, QueueFamily, Surface, SwapchainConfig,
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `QueueFamily`
[INFO] [stderr]   --> src/07_image_views.rs:13:41
[INFO] [stderr]    |
[INFO] [stderr] 13 |     Graphics, Instance, PhysicalDevice, QueueFamily, Surface, SwapchainConfig,
[INFO] [stderr]    |                                         ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Surface`
[INFO] [stderr]   --> src/07_image_views.rs:13:54
[INFO] [stderr]    |
[INFO] [stderr] 13 |     Graphics, Instance, PhysicalDevice, QueueFamily, Surface, SwapchainConfig,
[INFO] [stderr]    |                                                      ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 30 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0433`.
[INFO] [stderr] error: Could not compile `gfx-hal-tutorial`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: unused import: `Device`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:12:77
[INFO] [stderr]    |
[INFO] [stderr] 12 |     format, image, queue, window, Adapter, Backbuffer, Backend, Capability, Device, Features, Gpu,
[INFO] [stderr]    |                                                                             ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Instance`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:13:15
[INFO] [stderr]    |
[INFO] [stderr] 13 |     Graphics, Instance, PhysicalDevice, QueueFamily, Surface, SwapchainConfig,
[INFO] [stderr]    |               ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `PhysicalDevice`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:13:25
[INFO] [stderr]    |
[INFO] [stderr] 13 |     Graphics, Instance, PhysicalDevice, QueueFamily, Surface, SwapchainConfig,
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `QueueFamily`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:13:41
[INFO] [stderr]    |
[INFO] [stderr] 13 |     Graphics, Instance, PhysicalDevice, QueueFamily, Surface, SwapchainConfig,
[INFO] [stderr]    |                                         ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Surface`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:13:54
[INFO] [stderr]    |
[INFO] [stderr] 13 |     Graphics, Instance, PhysicalDevice, QueueFamily, Surface, SwapchainConfig,
[INFO] [stderr]    |                                                      ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 30 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0433`.
[INFO] [stderr] error: Could not compile `gfx-hal-tutorial`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: unused import: `Device`
[INFO] [stderr]   --> src/06_swap_chain_creation.rs:12:62
[INFO] [stderr]    |
[INFO] [stderr] 12 |     format, queue, Adapter, Backbuffer, Backend, Capability, Device, Features, Gpu, Graphics,
[INFO] [stderr]    |                                                              ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Instance`
[INFO] [stderr]   --> src/06_swap_chain_creation.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     Instance, PhysicalDevice, QueueFamily, Surface, SwapchainConfig,
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `PhysicalDevice`
[INFO] [stderr]   --> src/06_swap_chain_creation.rs:13:15
[INFO] [stderr]    |
[INFO] [stderr] 13 |     Instance, PhysicalDevice, QueueFamily, Surface, SwapchainConfig,
[INFO] [stderr]    |               ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `QueueFamily`
[INFO] [stderr]   --> src/06_swap_chain_creation.rs:13:31
[INFO] [stderr]    |
[INFO] [stderr] 13 |     Instance, PhysicalDevice, QueueFamily, Surface, SwapchainConfig,
[INFO] [stderr]    |                               ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Surface`
[INFO] [stderr]   --> src/06_swap_chain_creation.rs:13:44
[INFO] [stderr]    |
[INFO] [stderr] 13 |     Instance, PhysicalDevice, QueueFamily, Surface, SwapchainConfig,
[INFO] [stderr]    |                                            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 24 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0433`.
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/02_validation_layers.rs:34:16
[INFO] [stderr]    |
[INFO] [stderr] 34 |     _instance: back::Instance,
[INFO] [stderr]    |                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/02_validation_layers.rs:76:29
[INFO] [stderr]    |
[INFO] [stderr] 76 |     fn create_instance() -> back::Instance {
[INFO] [stderr]    |                             ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/02_validation_layers.rs:77:9
[INFO] [stderr]    |
[INFO] [stderr] 77 |         back::Instance::create(WINDOW_NAME, 1)
[INFO] [stderr]    |         ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `gfx-hal-tutorial`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/13_framebuffers.rs:37:34
[INFO] [stderr]    |
[INFO] [stderr] 37 |     swapchain_framebuffers: Vec<<back::Backend as Backend>::Framebuffer>,
[INFO] [stderr]    |                                  ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/13_framebuffers.rs:38:20
[INFO] [stderr]    |
[INFO] [stderr] 38 |     gfx_pipeline: <back::Backend as Backend>::GraphicsPipeline,
[INFO] [stderr]    |                    ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/13_framebuffers.rs:39:34
[INFO] [stderr]    |
[INFO] [stderr] 39 |     descriptor_set_layouts: Vec<<back::Backend as Backend>::DescriptorSetLayout>,
[INFO] [stderr]    |                                  ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/13_framebuffers.rs:40:23
[INFO] [stderr]    |
[INFO] [stderr] 40 |     pipeline_layout: <back::Backend as Backend>::PipelineLayout,
[INFO] [stderr]    |                       ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/13_framebuffers.rs:41:19
[INFO] [stderr]    |
[INFO] [stderr] 41 |     render_pass: <back::Backend as Backend>::RenderPass,
[INFO] [stderr]    |                   ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/13_framebuffers.rs:43:10
[INFO] [stderr]    |
[INFO] [stderr] 43 |         <back::Backend as Backend>::Image,
[INFO] [stderr]    |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/13_framebuffers.rs:44:10
[INFO] [stderr]    |
[INFO] [stderr] 44 |         <back::Backend as Backend>::ImageView,
[INFO] [stderr]    |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/13_framebuffers.rs:47:17
[INFO] [stderr]    |
[INFO] [stderr] 47 |     swapchain: <back::Backend as Backend>::Swapchain,
[INFO] [stderr]    |                 ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/13_framebuffers.rs:48:46
[INFO] [stderr]    |
[INFO] [stderr] 48 |     _command_queues: Vec<queue::CommandQueue<back::Backend, Graphics>>,
[INFO] [stderr]    |                                              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/13_framebuffers.rs:49:14
[INFO] [stderr]    |
[INFO] [stderr] 49 |     device: <back::Backend as Backend>::Device,
[INFO] [stderr]    |              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/13_framebuffers.rs:50:16
[INFO] [stderr]    |
[INFO] [stderr] 50 |     _surface: <back::Backend as Backend>::Surface,
[INFO] [stderr]    |                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/13_framebuffers.rs:51:23
[INFO] [stderr]    |
[INFO] [stderr] 51 |     _adapter: Adapter<back::Backend>,
[INFO] [stderr]    |                       ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/13_framebuffers.rs:52:16
[INFO] [stderr]    |
[INFO] [stderr] 52 |     _instance: back::Instance,
[INFO] [stderr]    |                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:158:29
[INFO] [stderr]     |
[INFO] [stderr] 158 |     fn create_instance() -> back::Instance {
[INFO] [stderr]     |                             ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:159:9
[INFO] [stderr]     |
[INFO] [stderr] 159 |         back::Instance::create(WINDOW_NAME, 1)
[INFO] [stderr]     |         ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:162:46
[INFO] [stderr]     |
[INFO] [stderr] 162 |     fn find_queue_families(adapter: &Adapter<back::Backend>) -> QueueFamilyIds {
[INFO] [stderr]     |                                              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:178:46
[INFO] [stderr]     |
[INFO] [stderr] 178 |     fn is_adapter_suitable(adapter: &Adapter<back::Backend>) -> bool {
[INFO] [stderr]     |                                              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:182:32
[INFO] [stderr]     |
[INFO] [stderr] 182 |     fn pick_adapter(instance: &back::Instance) -> Adapter<back::Backend> {
[INFO] [stderr]     |                                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:182:59
[INFO] [stderr]     |
[INFO] [stderr] 182 |     fn pick_adapter(instance: &back::Instance) -> Adapter<back::Backend> {
[INFO] [stderr]     |                                                           ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:193:20
[INFO] [stderr]     |
[INFO] [stderr] 193 |         instance: &back::Instance,
[INFO] [stderr]     |                    ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:195:11
[INFO] [stderr]     |
[INFO] [stderr] 195 |     ) -> <back::Backend as Backend>::Surface {
[INFO] [stderr]     |           ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:200:31
[INFO] [stderr]     |
[INFO] [stderr] 200 |         adapter: &mut Adapter<back::Backend>,
[INFO] [stderr]     |                               ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:201:20
[INFO] [stderr]     |
[INFO] [stderr] 201 |         surface: &<back::Backend as Backend>::Surface,
[INFO] [stderr]     |                    ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:203:10
[INFO] [stderr]     |
[INFO] [stderr] 203 |         <back::Backend as Backend>::Device,
[INFO] [stderr]     |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:204:33
[INFO] [stderr]     |
[INFO] [stderr] 204 |         Vec<queue::CommandQueue<back::Backend, Graphics>>,
[INFO] [stderr]     |                                 ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:236:27
[INFO] [stderr]     |
[INFO] [stderr] 236 |         adapter: &Adapter<back::Backend>,
[INFO] [stderr]     |                           ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:237:19
[INFO] [stderr]     |
[INFO] [stderr] 237 |         device: &<back::Backend as Backend>::Device,
[INFO] [stderr]     |                   ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:238:24
[INFO] [stderr]     |
[INFO] [stderr] 238 |         surface: &mut <back::Backend as Backend>::Surface,
[INFO] [stderr]     |                        ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:239:37
[INFO] [stderr]     |
[INFO] [stderr] 239 |         previous_swapchain: Option<<back::Backend as Backend>::Swapchain>,
[INFO] [stderr]     |                                     ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:241:10
[INFO] [stderr]     |
[INFO] [stderr] 241 |         <back::Backend as Backend>::Swapchain,
[INFO] [stderr]     |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:243:20
[INFO] [stderr]     |
[INFO] [stderr] 243 |         Backbuffer<back::Backend>,
[INFO] [stderr]     |                    ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:269:32
[INFO] [stderr]     |
[INFO] [stderr] 269 |         backbuffer: Backbuffer<back::Backend>,
[INFO] [stderr]     |                                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:271:19
[INFO] [stderr]     |
[INFO] [stderr] 271 |         device: &<back::Backend as Backend>::Device,
[INFO] [stderr]     |                   ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:273:10
[INFO] [stderr]     |
[INFO] [stderr] 273 |         <back::Backend as Backend>::Image,
[INFO] [stderr]     |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:274:10
[INFO] [stderr]     |
[INFO] [stderr] 274 |         <back::Backend as Backend>::ImageView,
[INFO] [stderr]     |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/04_logical_device.rs:32:46
[INFO] [stderr]    |
[INFO] [stderr] 32 |     _command_queues: Vec<queue::CommandQueue<back::Backend, Graphics>>,
[INFO] [stderr]    |                                              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/04_logical_device.rs:33:15
[INFO] [stderr]    |
[INFO] [stderr] 33 |     _device: <back::Backend as Backend>::Device,
[INFO] [stderr]    |               ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/04_logical_device.rs:34:23
[INFO] [stderr]    |
[INFO] [stderr] 34 |     _adapter: Adapter<back::Backend>,
[INFO] [stderr]    |                       ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/04_logical_device.rs:35:16
[INFO] [stderr]    |
[INFO] [stderr] 35 |     _instance: back::Instance,
[INFO] [stderr]    |                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/04_logical_device.rs:94:29
[INFO] [stderr]    |
[INFO] [stderr] 94 |     fn create_instance() -> back::Instance {
[INFO] [stderr]    |                             ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/04_logical_device.rs:95:9
[INFO] [stderr]    |
[INFO] [stderr] 95 |         back::Instance::create(WINDOW_NAME, 1)
[INFO] [stderr]    |         ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/04_logical_device.rs:98:46
[INFO] [stderr]    |
[INFO] [stderr] 98 |     fn find_queue_families(adapter: &Adapter<back::Backend>) -> QueueFamilyIds {
[INFO] [stderr]    |                                              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/04_logical_device.rs:114:46
[INFO] [stderr]     |
[INFO] [stderr] 114 |     fn is_adapter_suitable(adapter: &Adapter<back::Backend>) -> bool {
[INFO] [stderr]     |                                              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/04_logical_device.rs:118:32
[INFO] [stderr]     |
[INFO] [stderr] 118 |     fn pick_adapter(instance: &back::Instance) -> Adapter<back::Backend> {
[INFO] [stderr]     |                                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/04_logical_device.rs:118:59
[INFO] [stderr]     |
[INFO] [stderr] 118 |     fn pick_adapter(instance: &back::Instance) -> Adapter<back::Backend> {
[INFO] [stderr]     |                                                           ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/04_logical_device.rs:129:31
[INFO] [stderr]     |
[INFO] [stderr] 129 |         adapter: &mut Adapter<back::Backend>,
[INFO] [stderr]     |                               ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/04_logical_device.rs:131:10
[INFO] [stderr]     |
[INFO] [stderr] 131 |         <back::Backend as Backend>::Device,
[INFO] [stderr]     |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/04_logical_device.rs:132:33
[INFO] [stderr]     |
[INFO] [stderr] 132 |         Vec<queue::CommandQueue<back::Backend, Graphics>>,
[INFO] [stderr]     |                                 ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:303:19
[INFO] [stderr]     |
[INFO] [stderr] 303 |         device: &<back::Backend as Backend>::Device,
[INFO] [stderr]     |                   ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:305:11
[INFO] [stderr]     |
[INFO] [stderr] 305 |     ) -> <back::Backend as Backend>::RenderPass {
[INFO] [stderr]     |           ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:344:19
[INFO] [stderr]     |
[INFO] [stderr] 344 |         device: &<back::Backend as Backend>::Device,
[INFO] [stderr]     |                   ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:346:24
[INFO] [stderr]     |
[INFO] [stderr] 346 |         render_pass: &<back::Backend as Backend>::RenderPass,
[INFO] [stderr]     |                        ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:348:14
[INFO] [stderr]     |
[INFO] [stderr] 348 |         Vec<<back::Backend as Backend>::DescriptorSetLayout>,
[INFO] [stderr]     |              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:349:10
[INFO] [stderr]     |
[INFO] [stderr] 349 |         <back::Backend as Backend>::PipelineLayout,
[INFO] [stderr]     |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:350:10
[INFO] [stderr]     |
[INFO] [stderr] 350 |         <back::Backend as Backend>::GraphicsPipeline,
[INFO] [stderr]     |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:379:35
[INFO] [stderr]     |
[INFO] [stderr] 379 |                 pso::EntryPoint::<back::Backend> {
[INFO] [stderr]     |                                   ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:387:35
[INFO] [stderr]     |
[INFO] [stderr] 387 |                 pso::EntryPoint::<back::Backend> {
[INFO] [stderr]     |                                   ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |             let immutable_samplers = Vec::<<back::Backend as Backend>::Sampler>::new();
[INFO] [stderr]     |                                             ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:467:34
[INFO] [stderr]     |
[INFO] [stderr] 467 |             let ds_layouts: Vec<<back::Backend as Backend>::DescriptorSetLayout> = vec![device
[INFO] [stderr]     |                                  ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:516:19
[INFO] [stderr]     |
[INFO] [stderr] 516 |         device: &<back::Backend as Backend>::Device,
[INFO] [stderr]     |                   ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:517:24
[INFO] [stderr]     |
[INFO] [stderr] 517 |         render_pass: &<back::Backend as Backend>::RenderPass,
[INFO] [stderr]     |                        ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:519:14
[INFO] [stderr]     |
[INFO] [stderr] 519 |             <back::Backend as Backend>::Image,
[INFO] [stderr]     |              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:520:14
[INFO] [stderr]     |
[INFO] [stderr] 520 |             <back::Backend as Backend>::ImageView,
[INFO] [stderr]     |              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:523:15
[INFO] [stderr]     |
[INFO] [stderr] 523 |     ) -> Vec<<back::Backend as Backend>::Framebuffer> {
[INFO] [stderr]     |               ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/13_framebuffers.rs:524:46
[INFO] [stderr]     |
[INFO] [stderr] 524 |         let mut swapchain_framebuffers: Vec<<back::Backend as Backend>::Framebuffer> = Vec::new();
[INFO] [stderr]     |                                              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0433`.
[INFO] [stderr] error: Could not compile `gfx-hal-tutorial`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: unused import: `Instance`
[INFO] [stderr]   --> src/04_logical_device.rs:12:67
[INFO] [stderr]    |
[INFO] [stderr] 12 |     queue, Adapter, Backend, Capability, Features, Gpu, Graphics, Instance, PhysicalDevice,
[INFO] [stderr]    |                                                                   ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `PhysicalDevice`
[INFO] [stderr]   --> src/04_logical_device.rs:12:77
[INFO] [stderr]    |
[INFO] [stderr] 12 |     queue, Adapter, Backend, Capability, Features, Gpu, Graphics, Instance, PhysicalDevice,
[INFO] [stderr]    |                                                                             ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `QueueFamily`
[INFO] [stderr]   --> src/04_logical_device.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     QueueFamily,
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 13 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0433`.
[INFO] [stderr] error: Could not compile `gfx-hal-tutorial`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: unused import: `Device`
[INFO] [stderr]   --> src/13_framebuffers.rs:13:88
[INFO] [stderr]    |
[INFO] [stderr] 13 |     format, image, pass, pso, queue, window, Adapter, Backbuffer, Backend, Capability, Device,
[INFO] [stderr]    |                                                                                        ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Instance`
[INFO] [stderr]   --> src/13_framebuffers.rs:14:30
[INFO] [stderr]    |
[INFO] [stderr] 14 |     Features, Gpu, Graphics, Instance, PhysicalDevice, Primitive, QueueFamily, Surface,
[INFO] [stderr]    |                              ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `PhysicalDevice`
[INFO] [stderr]   --> src/13_framebuffers.rs:14:40
[INFO] [stderr]    |
[INFO] [stderr] 14 |     Features, Gpu, Graphics, Instance, PhysicalDevice, Primitive, QueueFamily, Surface,
[INFO] [stderr]    |                                        ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `QueueFamily`
[INFO] [stderr]   --> src/13_framebuffers.rs:14:67
[INFO] [stderr]    |
[INFO] [stderr] 14 |     Features, Gpu, Graphics, Instance, PhysicalDevice, Primitive, QueueFamily, Surface,
[INFO] [stderr]    |                                                                   ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Surface`
[INFO] [stderr]   --> src/13_framebuffers.rs:14:80
[INFO] [stderr]    |
[INFO] [stderr] 14 |     Features, Gpu, Graphics, Instance, PhysicalDevice, Primitive, QueueFamily, Surface,
[INFO] [stderr]    |                                                                                ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 52 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0433`.
[INFO] [stderr] error: Could not compile `gfx-hal-tutorial`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:35:10
[INFO] [stderr]    |
[INFO] [stderr] 35 |         <back::Backend as Backend>::Image,
[INFO] [stderr]    |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:36:10
[INFO] [stderr]    |
[INFO] [stderr] 36 |         <back::Backend as Backend>::ImageView,
[INFO] [stderr]    |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:39:17
[INFO] [stderr]    |
[INFO] [stderr] 39 |     swapchain: <back::Backend as Backend>::Swapchain,
[INFO] [stderr]    |                 ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:40:46
[INFO] [stderr]    |
[INFO] [stderr] 40 |     _command_queues: Vec<queue::CommandQueue<back::Backend, Graphics>>,
[INFO] [stderr]    |                                              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:41:14
[INFO] [stderr]    |
[INFO] [stderr] 41 |     device: <back::Backend as Backend>::Device,
[INFO] [stderr]    |              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:42:16
[INFO] [stderr]    |
[INFO] [stderr] 42 |     _surface: <back::Backend as Backend>::Surface,
[INFO] [stderr]    |                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:43:23
[INFO] [stderr]    |
[INFO] [stderr] 43 |     _adapter: Adapter<back::Backend>,
[INFO] [stderr]    |                       ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:44:16
[INFO] [stderr]    |
[INFO] [stderr] 44 |     _instance: back::Instance,
[INFO] [stderr]    |                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:121:29
[INFO] [stderr]     |
[INFO] [stderr] 121 |     fn create_instance() -> back::Instance {
[INFO] [stderr]     |                             ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:122:9
[INFO] [stderr]     |
[INFO] [stderr] 122 |         back::Instance::create(WINDOW_NAME, 1)
[INFO] [stderr]     |         ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:125:46
[INFO] [stderr]     |
[INFO] [stderr] 125 |     fn find_queue_families(adapter: &Adapter<back::Backend>) -> QueueFamilyIds {
[INFO] [stderr]     |                                              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:141:46
[INFO] [stderr]     |
[INFO] [stderr] 141 |     fn is_adapter_suitable(adapter: &Adapter<back::Backend>) -> bool {
[INFO] [stderr]     |                                              ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:145:32
[INFO] [stderr]     |
[INFO] [stderr] 145 |     fn pick_adapter(instance: &back::Instance) -> Adapter<back::Backend> {
[INFO] [stderr]     |                                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:145:59
[INFO] [stderr]     |
[INFO] [stderr] 145 |     fn pick_adapter(instance: &back::Instance) -> Adapter<back::Backend> {
[INFO] [stderr]     |                                                           ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:156:20
[INFO] [stderr]     |
[INFO] [stderr] 156 |         instance: &back::Instance,
[INFO] [stderr]     |                    ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:158:11
[INFO] [stderr]     |
[INFO] [stderr] 158 |     ) -> <back::Backend as Backend>::Surface {
[INFO] [stderr]     |           ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:163:31
[INFO] [stderr]     |
[INFO] [stderr] 163 |         adapter: &mut Adapter<back::Backend>,
[INFO] [stderr]     |                               ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:164:20
[INFO] [stderr]     |
[INFO] [stderr] 164 |         surface: &<back::Backend as Backend>::Surface,
[INFO] [stderr]     |                    ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:166:10
[INFO] [stderr]     |
[INFO] [stderr] 166 |         <back::Backend as Backend>::Device,
[INFO] [stderr]     |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:167:33
[INFO] [stderr]     |
[INFO] [stderr] 167 |         Vec<queue::CommandQueue<back::Backend, Graphics>>,
[INFO] [stderr]     |                                 ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:199:27
[INFO] [stderr]     |
[INFO] [stderr] 199 |         adapter: &Adapter<back::Backend>,
[INFO] [stderr]     |                           ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:200:19
[INFO] [stderr]     |
[INFO] [stderr] 200 |         device: &<back::Backend as Backend>::Device,
[INFO] [stderr]     |                   ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:201:24
[INFO] [stderr]     |
[INFO] [stderr] 201 |         surface: &mut <back::Backend as Backend>::Surface,
[INFO] [stderr]     |                        ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:202:37
[INFO] [stderr]     |
[INFO] [stderr] 202 |         previous_swapchain: Option<<back::Backend as Backend>::Swapchain>,
[INFO] [stderr]     |                                     ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:204:10
[INFO] [stderr]     |
[INFO] [stderr] 204 |         <back::Backend as Backend>::Swapchain,
[INFO] [stderr]     |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:205:20
[INFO] [stderr]     |
[INFO] [stderr] 205 |         Backbuffer<back::Backend>,
[INFO] [stderr]     |                    ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:231:32
[INFO] [stderr]     |
[INFO] [stderr] 231 |         backbuffer: Backbuffer<back::Backend>,
[INFO] [stderr]     |                                ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:233:19
[INFO] [stderr]     |
[INFO] [stderr] 233 |         device: &<back::Backend as Backend>::Device,
[INFO] [stderr]     |                   ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:235:10
[INFO] [stderr]     |
[INFO] [stderr] 235 |         <back::Backend as Backend>::Image,
[INFO] [stderr]     |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `back`
[INFO] [stderr]    --> src/08_graphics_pipeline.rs:236:10
[INFO] [stderr]     |
[INFO] [stderr] 236 |         <back::Backend as Backend>::ImageView,
[INFO] [stderr]     |          ^^^^ use of undeclared type or module `back`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Device`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:12:77
[INFO] [stderr]    |
[INFO] [stderr] 12 |     format, image, queue, window, Adapter, Backbuffer, Backend, Capability, Device, Features, Gpu,
[INFO] [stderr]    |                                                                             ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Instance`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:13:15
[INFO] [stderr]    |
[INFO] [stderr] 13 |     Graphics, Instance, PhysicalDevice, QueueFamily, Surface, SwapchainConfig,
[INFO] [stderr]    |               ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `PhysicalDevice`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:13:25
[INFO] [stderr]    |
[INFO] [stderr] 13 |     Graphics, Instance, PhysicalDevice, QueueFamily, Surface, SwapchainConfig,
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `QueueFamily`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:13:41
[INFO] [stderr]    |
[INFO] [stderr] 13 |     Graphics, Instance, PhysicalDevice, QueueFamily, Surface, SwapchainConfig,
[INFO] [stderr]    |                                         ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Surface`
[INFO] [stderr]   --> src/08_graphics_pipeline.rs:13:54
[INFO] [stderr]    |
[INFO] [stderr] 13 |     Graphics, Instance, PhysicalDevice, QueueFamily, Surface, SwapchainConfig,
[INFO] [stderr]    |                                                      ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 30 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0433`.
[INFO] [stderr] error: Could not compile `gfx-hal-tutorial`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "c91cc97970e816d1ed4983852ab124b67cd0068b19c54ec4c7be04913835bee2"`
[INFO] running `"docker" "rm" "-f" "c91cc97970e816d1ed4983852ab124b67cd0068b19c54ec4c7be04913835bee2"`
[INFO] [stdout] c91cc97970e816d1ed4983852ab124b67cd0068b19c54ec4c7be04913835bee2