return join q{, }, @items, "and $tail";
}
+sub quoted_english_list {
+ return qq{'$_[0]'} if @_ == 1;
+
+ my @items = sort @_;
+
+ return qq{'$items[0]' and '$items[1]'} if @items == 2;
+
+ my $tail = pop @items;
+
+ return join q{, }, (map{ qq{'$_'} } @items), qq{and '$tail'};
+}
+
# common utilities
sub not_supported{