所有評論都是塊評論

(*************************************************
*  All comments in SML are block comments
*  Block Comments begin with '(*'
*  Block Comments end with '*)'
*  (* Block Comments can be nested *)
*  The additional framing asterisks at the beginning
*  and end of this block comment are common to languages
*  of SML's vintage.
*  Likewise the asterisk at the start of each line
*  But this is solely a matter of style.
**************************************************)

val _ = print "Block comment example\n" (* line ending block comment *)