Clean up E0045

Author: GuillaumeGomez

src/librustc_error_codes/error_codes/E0045.md

@@ -1,18 +1,18 @@
-Rust only supports variadic parameters for interoperability with C code in its
-FFI. As such, variadic parameters can only be used with functions which are
-using the C ABI. Examples of erroneous code:
-
-```compile_fail
-#![feature(unboxed_closures)]
+Variadic parameters have been used on a non-C ABI function.
 
-extern "rust-call" { fn foo(x: u8, ...); }
+Erroneous code example:
 
-// or
+```compile_fail,E0045
+#![feature(unboxed_closures)]
 
-fn foo(x: u8, ...) {}
+extern "rust-call" {
+    fn foo(x: u8, ...); // error!
+}
 ```
 
-To fix such code, put them in an extern "C" block:
+Rust only supports variadic parameters for interoperability with C code in its
+FFI. As such, variadic parameters can only be used with functions which are
+using the C ABI. To fix such code, put them in an extern "C" block:
 
 ```
 extern "C" {