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+A pattern was declared as an argument in a foreign function declaration.
+
+Erroneous code example:
+
+```compile_fail,E0130
+extern "C" {
+    fn foo((a, b): (u32, u32)); // error: patterns aren't allowed in foreign
+                                //        function declarations
+}
+```
+
+To fix this error, replace the pattern argument with a regular one. Example:
+
+```
+struct SomeStruct {
+    a: u32,
+    b: u32,
+}
+
+extern "C" {
+    fn foo(s: SomeStruct); // ok!
+}
+```
+
+Or:
+
+```
+extern "C" {
+    fn foo(a: (u32, u32)); // ok!
+}
+```