[pure-lang-svn] SF.net SVN: pure-lang:[713] pure/trunk/lib/prelude.pure

[<ag...@us...>]

Revision: 713
          http://pure-lang.svn.sourceforge.net/pure-lang/?rev=713&view=rev
Author:   agraef
Date:     2008-09-05 09:51:32 +0000 (Fri, 05 Sep 2008)

Log Message:
-----------
Comment change.

Modified Paths:
--------------
    pure/trunk/lib/prelude.pure

Modified: pure/trunk/lib/prelude.pure
===================================================================
--- pure/trunk/lib/prelude.pure	2008-09-05 09:38:43 UTC (rev 712)
+++ pure/trunk/lib/prelude.pure	2008-09-05 09:51:32 UTC (rev 713)
@@ -439,7 +439,8 @@
   /* Unfortunately, the global list concatenation operator (+) isn't fully
      lazy in Pure, because it's also used for arithmetic operations. Using it
      here would make foldr (and hence cat) eager. Therefore we use our own
-     lazy concatenation operation here. */
+     concatenation operation here, which properly deals with the case that ys
+     is an infinite stream. */
   []+ys			= ys;
   xs@(_:_)+ys		= tick [] xs ys;
   tick zs (x:xs) ys	= tack (x:zs) ((xs+ys)&) if thunkp xs;


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