[WWcvs] pg: Better error messages for unreduced unions.

[dpvc v. a. <we...@ma...>]

Log Message:
-----------
Better error messages for unreduced unions.

Modified Files:
--------------
    pg/lib/Value:
        AnswerChecker.pm

Revision Data
-------------
Index: AnswerChecker.pm
===================================================================
RCS file: /webwork/cvs/system/pg/lib/Value/AnswerChecker.pm,v
retrieving revision 1.62
retrieving revision 1.63
diff -Llib/Value/AnswerChecker.pm -Llib/Value/AnswerChecker.pm -u -r1.62 -r1.63
--- lib/Value/AnswerChecker.pm
+++ lib/Value/AnswerChecker.pm
@@ -260,12 +260,12 @@
                 !$ans->{isPreview} && !Value::isFormula($student);
   if ($student->type eq 'Union' && $student->length >= 2) {
     my $reduced = $student->reduce;
-    return "Your$nth union can be written in a simpler form"
+    return "Your$nth union can be written without overlaps"
       unless $reduced->type eq 'Union' && $reduced->length == $student->length;
     my @R = $reduced->sort->value;
     my @S = $student->sort->value;
     foreach my $i (0..$#R) {
-      return "Your$nth union can be written in a simpler form"
+      return "Your$nth union can be written without overlaps"
 	unless $R[$i] == $S[$i] && $R[$i]->length == $S[$i]->length;
     }
   } elsif ($student->type eq 'Set' && $student->length >= 2) {