1 files changed, 92 insertions, 0 deletions
diff --git a/src/tools/rustfmt/tests/source/extern.rs b/src/tools/rustfmt/tests/source/extern.rs
new file mode 100644
index 000000000..f51ba6e98
--- /dev/null
+++ b/src/tools/rustfmt/tests/source/extern.rs
@@ -0,0 +1,92 @@
+// rustfmt-normalize_comments: true
+
+ extern crate       foo    ;   
+    extern crate       foo       as bar    ;   
+
+extern crate futures;
+extern crate dotenv;
+extern crate chrono;
+
+extern crate foo;
+extern crate bar;
+
+// #2315
+extern crate proc_macro2;
+extern crate proc_macro;
+
+// #3128
+extern crate serde; // 1.0.78
+extern crate serde_derive; // 1.0.78
+extern crate serde_json; // 1.0.27
+
+ 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
+
+  pub      type
+      Foo;
+
+          type   Bar;
+}
+
+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;
+
+
+       const fn foo(
+
+       ) ->
+                            *mut Bar;
+       unsafe fn foo(
+
+       ) -> *
+       mut
+       Bar;
+
+       pub(super) const fn foo() -> *mut Bar;
+       pub(crate) unsafe fn foo() -> *mut Bar;
+   }
+
+extern {
+
+}
+
+macro_rules! x {
+    ($tt:tt) => {};
+}
+
+extern "macros" {
+    x!(ident);
+    x!(#);
+    x![ident];
+    x![#];
+    x! {ident}
+    x! {#}
+}