exception.to_s   →  string

Returns exception’s message (or the name of the exception if no message is set).

Source Code

/*
* call-seq:
*   exception.to_s   =>  string
*
* Returns exception's message (or the name of the exception if
* no message is set).
*/

static VALUE
exc_to_s(exc)
   VALUE exc;
{
   VALUE mesg = rb_attr_get(exc, rb_intern("mesg"));

   if (NIL_P(mesg)) return rb_class_name(CLASS_OF(exc));
   if (OBJ_TAINTED(exc)) OBJ_TAINT(mesg);
   return mesg;
}