[m-rev.] for post-commit review: three speedups

[Zoltan Somogyi]

NEWS:
library/map.m:
library/varset.m:
	Address post-commit review comments.

Zoltan.

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Index: NEWS
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/NEWS,v
retrieving revision 1.612
diff -u -b -r1.612 NEWS
--- NEWS	14 Jun 2012 07:03:56 -0000	1.612
+++ NEWS	18 Jun 2012 07:57:41 -0000
@@ -15,7 +15,7 @@
 
 * The map and varset modules each have a new predicate that deletes
   a sorted list of items from a map or varset, and can do so faster than
-  usual exploiting the order.
+  usual by exploiting the order.
   
 * The map and tree234 modules each have a new predicate that does a search,
   and if the search is unsuccessful, does an insertion during the *same*
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Index: library/map.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/library/map.m,v
retrieving revision 1.130
diff -u -b -r1.130 map.m
--- library/map.m	14 Jun 2012 07:03:56 -0000	1.130
+++ library/map.m	18 Jun 2012 07:57:41 -0000
@@ -239,7 +239,8 @@
 :- pred map.delete_list(list(K)::in, map(K, V)::in, map(K, V)::out) is det.
 
     % Apply map.delete/3 to a sorted list of keys. The fact that the list
-    % is sorted may make this more efficient.
+    % is sorted may make this more efficient. (If the list is not sorted,
+    % the result will be either an abort or incorrect output.)
     %
 :- func map.delete_sorted_list(map(K, V), list(K)) = map(K, V).
 :- pred map.delete_sorted_list(list(K)::in, map(K, V)::in, map(K, V)::out)
Index: library/varset.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/library/varset.m,v
retrieving revision 1.92
diff -u -b -r1.92 varset.m
--- library/varset.m	14 Jun 2012 07:03:57 -0000	1.92
+++ library/varset.m	18 Jun 2012 07:57:41 -0000
@@ -90,6 +90,8 @@
     is det.
 
     % Delete the names and values for a sorted list of variables.
+    % (If the list is not sorted, the result will be either an abort
+    % or incorrect output.)
     %
 :- func varset.delete_sorted_vars(varset(T), list(var(T))) = varset(T).
 :- pred varset.delete_sorted_vars(list(var(T))::in,
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