Fix test.

tests/comments.rs

@@ -77,6 +77,9 @@ fn test_comments_doc() -> Result<(), Box<EvalAltResult>> {
 
     assert_eq!(
         ast.iter_functions().next().unwrap().comments[0],
+        #[cfg(feature = "no_position")]
+        "/** Hello world\n            ** how are you?\n            **/",
+        #[cfg(not(feature = "no_position"))]
         "/** Hello world\n** how are you?\n**/"
     );