rust/tests/source/extern.rs

 extern  "C" {
  fn c_func(x: *mut *mut libc::c_void);

  fn c_func(x: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX, y: YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY);

    #[test123]
    fn foo() -> uint64_t;

pub fn bar() ;
   }

extern {
        fn DMR_GetDevice(pHDev: *mut HDEV, searchMode: DeviceSearchMode, pSearchString: *const c_char, devNr: c_uint, wildcard: c_char) -> TDMR_ERROR;
        
    fn quux() -> (); // Post comment
}

extern "Rust" { static ext:  u32;
    // Some comment.
     pub static  mut var : SomeType ; }

extern "C" {
            fn syscall(number: libc::c_long /* comment 1 */, /* comm 2 */ ... /* sup? */) -> libc::c_long;

    fn  foo  (x:  *const c_char ,    ...   ) ->
libc::c_long;
        }

   extern    {  
                       pub fn freopen(filename: *const c_char, mode: *const c_char
                               , mode2: *const c_char
                               , mode3: *const c_char,
                               file: *mut FILE)
                              -> *mut FILE;
   }

extern {

}