Function vkGetBufferCollectionPropertiesFUCHSIA 

pub unsafe extern "system" fn vkGetBufferCollectionPropertiesFUCHSIA(
    device: VkDevice,
    collection: VkBufferCollectionFUCHSIA,
    pProperties: *mut VkBufferCollectionPropertiesFUCHSIA,
) -> VkResult

Available if built with prototypes.