//
// This will silently create one if it doesn't already exist, or it'll
// open up a handle to one if it already exists.
- let mutex = CreateMutexA(0 as *mut _, 0, cname.as_ptr() as *const u8);
+ let mutex = CreateMutexA(std::ptr::null_mut(), 0, cname.as_ptr() as *const u8);
if mutex.is_null() {
panic!("failed to create global mutex named `{}`: {}",
name,