+#!perl
+
+use strict;
+use warnings;
+
+use Test::More tests => 6 * 2;
+
+my @comp = (0, 0);
+my @exec = (0, 0);
+
+my $rx;
+
+{
+ use re::engine::Plugin comp => sub { ++$comp[0] },
+ exec => sub { ++$exec[0]; 0 };
+
+ eval '$rx = qr/foo/';
+ is "@comp", '1 0', 'is compiled with the first engine';
+ is "@exec", '0 0', 'not executed yet';
+}
+
+"abc" =~ /$rx/;
+is "@comp", '1 0', 'was compiled with the first engine';
+is "@exec", '1 0', 'is executed with the first engine';
+
+{
+ use re::engine::Plugin comp => sub { ++$comp[1] },
+ exec => sub { ++$exec[1]; 0 };
+
+ "def" =~ /$rx/;
+ is "@comp", '1 0', 'was still compiled with the first engine';
+ is "@exec", '2 0', 'is executed with the first engine again';
+
+ eval '$rx = qr/bar/';
+ is "@comp", '1 1', 'is compiled with the second engine';
+ is "@exec", '2 0', 'not executed since last time';
+}
+
+"ghi" =~ /$rx/;
+is "@comp", '1 1', 'was compiled with the second engine';
+is "@exec", '2 1', 'is executed with the second engine';
+
+{
+ use re 'debug';
+
+ "jkl" =~ /$rx/;
+ is "@comp", '1 1', 'was still compiled with the second engine';
+ is "@exec", '2 2', 'is executed with the second engine again (and not with "re \'debug\'")';
+}