tuned comment;

--- a/src/Pure/library.ML	Fri Feb 13 20:16:02 1998 +0100
+++ b/src/Pure/library.ML	Wed Feb 18 10:37:48 1998 +0100
@@ -616,7 +616,7 @@
   | is_quasi_letter ch = is_letter ch;
 
 (*white space: blanks, tabs, newlines, formfeeds*)
-val is_blank : string -> bool =
+val is_blank : string -> bool =					(* FIXME *)
   fn " " => true | "\t" => true | "\n" => true | "\^L" => true | "\160" => true
     | _ => false;