fixes #475

code/beginner/tutorial2-surface/src/lib.rs

@@ -15,6 +15,9 @@ struct State {
     queue: wgpu::Queue,
     config: wgpu::SurfaceConfiguration,
     size: winit::dpi::PhysicalSize<u32>,
+    // The window must be declared after the surface so
+    // it gets dropped after it as the surface contains
+    // unsafe references to the window's resources.
     window: Window,
 }
 

docs/beginner/tutorial2-surface/README.md

@@ -13,6 +13,9 @@ struct State {
     queue: wgpu::Queue,
     config: wgpu::SurfaceConfiguration,
     size: winit::dpi::PhysicalSize<u32>,
+    // The window must be declared after the surface so
+    // it gets dropped after it as the surface contains
+    // unsafe references to the window's resources.
     window: Window,
 }