wgpu allows multiple attachments that alias same memory

[aleokdev]

Description
In Vulkan:

Multiple attachments that alias the same memory must not be used in a single subpass.

However, this is valid behavior in wgpu, even with the Vulkan backend.

Repro steps
Put this down on a renderpass of any simple example that clears the window:

color_attachments: &[
    Some(wgpu::RenderPassColorAttachment {
        view: &view,
        ops: wgpu::Operations {
            load: wgpu::LoadOp::Clear(wgpu::Color::BLACK),
            store: true,
        },
        resolve_target: None,
    }),
    Some(wgpu::RenderPassColorAttachment {
        view: &view,
        ops: wgpu::Operations {
            load: wgpu::LoadOp::Clear(wgpu::Color::WHITE),
            store: true,
        },
        resolve_target: None,
    }),
],

For me, the window clears as white consistently.

Expected vs observed behavior
This should not run.

Platform
Works on latest wgpu 0.14. Checked with both Manjaro X11 on a Nvidia card and Fedora Wayland on an integrated AMD processor.