1 files changed, 46 insertions, 0 deletions
diff --git a/t/op/exists_sub.t b/t/op/exists_sub.t
new file mode 100755
index 0000000000..3363dfd837
--- /dev/null
+++ b/t/op/exists_sub.t
@@ -0,0 +1,46 @@
+#!./perl
+
+BEGIN {
+    chdir 't' if -d 't';
+    unshift @INC, '../lib';
+}
+
+print "1..9\n";
+
+sub t1;
+sub t2 : locked;
+sub t3 ();
+sub t4 ($);
+sub t5 {1;}
+{
+    package P1;
+    sub tmc {1;}
+    package P2;
+    @ISA = 'P1';
+}
+
+print "not " unless exists &t1 && not defined &t1;
+print "ok 1\n";
+print "not " unless exists &t2 && not defined &t2;
+print "ok 2\n";
+print "not " unless exists &t3 && not defined &t3;
+print "ok 3\n";
+print "not " unless exists &t4 && not defined &t4;
+print "ok 4\n";
+print "not " unless exists &t5 && defined &t5;
+print "ok 5\n";
+P2::->tmc;
+print "not " unless not exists &P2::tmc && not defined &P2::tmc;
+print "ok 6\n";
+my $ref;
+$ref->{A}[0] = \&t4;
+print "not " unless exists &{$ref->{A}[0]} && not defined &{$ref->{A}[0]};
+print "ok 7\n";
+undef &P1::tmc;
+print "not " unless exists &P1::tmc && not defined &P1::tmc;
+print "ok 8\n";
+eval 'exists &t5()';
+print "not " unless $@;
+print "ok 9\n";
+
+exit 0;