Add missing end of string

GuillaumeGomez · GuillaumeGomez · commit 3c987812569f · 2015-06-24T09:38:42.000+02:00
diff --git a/src/librustc_typeck/diagnostics.rs b/src/librustc_typeck/diagnostics.rs
@@ -394,6 +394,7 @@ need:
 extern { fn some_func_i32(x: i32); }
 extern { fn some_func_i64(x: i64); }
 ```
+"##,
 
 E0045: r##"
 Rust only supports variadic parameters for interoperability with C code in its
