Function build_instance_bind_group 

pub fn build_instance_bind_group(
    device: &Device,
    layout: &BindGroupLayout,
    target_entries: &[BindingEntry],
    resolved: &[(&'static str, BindingResource<'_>)],
) -> Option<BindGroup>

Builds a bind group matching each (name, resource) pair in resolved to its @binding(N) via target_entries. Returns None if any name in resolved has no matching entry — the caller (GPUBindingInstance::upload) turns that into a None upload result via ?, which the sync system retries next tick rather than treating as fatal (see Asset::upload).