Function vkWriteSamplerDescriptorsEXT 

pub unsafe extern "system" fn vkWriteSamplerDescriptorsEXT(
    device: VkDevice,
    samplerCount: u32,
    pSamplers: *const VkSamplerCreateInfo,
    pDescriptors: *const VkHostAddressRangeEXT,
) -> VkResult

Available if built with prototypes.