error[E0308]: `match` arms have incompatible types
  --> src/lib.rs:89:37
   |
87 |       let result = catch_unwind(|| match unsafe { CStr::from_ptr(p_name) }.to_bytes() {
   |                                    -------------------------------------------------- `match` arms have incompatible types
88 |           b"vkCreateInstance" => &CheakoCache_CreateInstance as *const vk::PFN_vkVoidFunction,
   |                                  ------------------------------------------------------------ this is found to be of type `*const Option<unsafe extern "system" fn()>`
89 |           b"vkGetInstanceProcAddr" => Some(std::mem::transmute::<_, unsafe extern "system" fn()>(
   |  _____________________________________^
90 | |             CheakoCache_GetInstanceProcAddr as *const fn(),
91 | |         )),
   | |__________^ expected *-ptr, found enum `Option`
   |
   = note: expected type `*const Option<unsafe extern "system" fn()>`
              found enum `Option<unsafe extern "system" fn()>`

error[E0606]: casting `&unsafe extern "system" fn(*const InstanceCreateInfo, Option<*const AllocationCallbacks>, *mut ash::vk::Instance) -> ash::vk::Result {CheakoCache_CreateInstance}` as `*const Option<unsafe extern "system" fn()>` is invalid
  --> src/lib.rs:88:32
   |
88 |         b"vkCreateInstance" => &CheakoCache_CreateInstance as *const vk::PFN_vkVoidFunction,
   |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Some errors have detailed explanations: E0308, E0606.
For more information about an error, try `rustc --explain E0308`.
warning: `vk_layer_cache` (lib) generated 2 warnings
error: could not compile `vk_layer_cache` due to 2 previous errors; 2 warnings emitted