Function vkSetBufferCollectionBufferConstraintsFUCHSIA 

pub unsafe extern "system" fn vkSetBufferCollectionBufferConstraintsFUCHSIA(
    device: VkDevice,
    collection: VkBufferCollectionFUCHSIA,
    pBufferConstraintsInfo: *const VkBufferConstraintsInfoFUCHSIA,
) -> VkResult

Available if built with prototypes.