Deprecate bigrat.pl with a warning

diff --git a/lib/bigrat.pl b/lib/bigrat.pl
index 2d3738f..f5378b8 100644 (file)
--- a/lib/bigrat.pl
+++ b/lib/bigrat.pl
@@ -3,12 +3,18 @@ require "bigint.pl";
 #
 # This library is no longer being maintained, and is included for backward
 # compatibility with Perl 4 programs which may require it.
+# This legacy library is deprecated and will be removed in a future
+# release of perl.
 #
 # In particular, this should not be used as an example of modern Perl
 # programming techniques.
 #
 # Arbitrary size rational math package
-#
+
+warn( "The 'bigrat.pl' legacy library is deprecated and will be"
+      . " removed in the next major release of perl. Please use the"
+      . " bigrat module instead." );
+
 # by Mark Biggar
 #
 # Input values to these routines consist of strings of the form