* expand tabs.

vm_insnhelper.c

@@ -3848,7 +3848,7 @@ vm_opt_plus(VALUE recv, VALUE obj)
     else if (RBASIC_CLASS(recv) == rb_cString &&
 	     RBASIC_CLASS(obj) == rb_cString &&
 	     BASIC_OP_UNREDEFINED_P(BOP_PLUS, STRING_REDEFINED_OP_FLAG)) {
-	return rb_str_opt_plus(recv, obj);
+        return rb_str_opt_plus(recv, obj);
     }
     else if (RBASIC_CLASS(recv) == rb_cArray &&
              RBASIC_CLASS(obj) == rb_cArray &&