+#!./perl
+
+#
+# test method calls and autoloading.
+#
+
+BEGIN {
+ chdir 't' if -d 't';
+ @INC = '../lib';
+}
+
+print "1..53\n";
+
+@A::ISA = 'B';
+@B::ISA = 'C';
+
+sub C::d {"C::d"}
+sub D::d {"D::d"}
+
+my $cnt = 0;
+sub test {
+ print "# got `$_[0]', expected `$_[1]'\nnot " unless $_[0] eq $_[1];
+ # print "not " unless shift eq shift;
+ print "ok ", ++$cnt, "\n"
+}
+
+# First, some basic checks of method-calling syntax:
+$obj = bless [], "Pack";
+sub Pack::method { shift; join(",", "method", @_) }
+$mname = "method";
+
+test(Pack->method("a","b","c"), "method,a,b,c");
+test(Pack->$mname("a","b","c"), "method,a,b,c");
+test(method Pack ("a","b","c"), "method,a,b,c");
+test((method Pack "a","b","c"), "method,a,b,c");
+
+test(Pack->method(), "method");
+test(Pack->$mname(), "method");
+test(method Pack (), "method");
+test(Pack->method, "method");
+test(Pack->$mname, "method");
+test(method Pack, "method");
+
+test($obj->method("a","b","c"), "method,a,b,c");
+test($obj->$mname("a","b","c"), "method,a,b,c");
+test((method $obj ("a","b","c")), "method,a,b,c");
+test((method $obj "a","b","c"), "method,a,b,c");
+
+test($obj->method(), "method");
+test($obj->$mname(), "method");
+test((method $obj ()), "method");
+test($obj->method, "method");
+test($obj->$mname, "method");
+test(method $obj, "method");
+
+test( A->d, "C::d"); # Update hash table;
+
+*B::d = \&D::d; # Import now.
+test (A->d, "D::d"); # Update hash table;
+
+{
+ local @A::ISA = qw(C); # Update hash table with split() assignment
+ test (A->d, "C::d");
+ $#A::ISA = -1;
+ test (eval { A->d } || "fail", "fail");
+}
+test (A->d, "D::d");
+
+{
+ local *B::d;
+ eval 'sub B::d {"B::d1"}'; # Import now.
+ test (A->d, "B::d1"); # Update hash table;
+ undef &B::d;
+ test ((eval { A->d }, ($@ =~ /Undefined subroutine/)), 1);
+}
+
+test (A->d, "D::d"); # Back to previous state
+
+eval 'sub B::d {"B::d2"}'; # Import now.
+test (A->d, "B::d2"); # Update hash table;
+
+# What follows is hardly guarantied to work, since the names in scripts
+# are already linked to "pruned" globs. Say, `undef &B::d' if it were
+# after `delete $B::{d}; sub B::d {}' would reach an old subroutine.
+
+undef &B::d;
+delete $B::{d};
+test (A->d, "C::d"); # Update hash table;
+
+eval 'sub B::d {"B::d3"}'; # Import now.
+test (A->d, "B::d3"); # Update hash table;
+
+delete $B::{d};
+*dummy::dummy = sub {}; # Mark as updated
+test (A->d, "C::d");
+
+eval 'sub B::d {"B::d4"}'; # Import now.
+test (A->d, "B::d4"); # Update hash table;
+
+delete $B::{d}; # Should work without any help too
+test (A->d, "C::d");
+
+{
+ local *C::d;
+ test (eval { A->d } || "nope", "nope");
+}
+test (A->d, "C::d");
+
+*A::x = *A::d; # See if cache incorrectly follows synonyms
+A->d;
+test (eval { A->x } || "nope", "nope");
+
+eval <<'EOF';
+sub C::e;
+BEGIN { *B::e = \&C::e } # Shouldn't prevent AUTOLOAD in original pkg
+sub Y::f;
+$counter = 0;
+
+@X::ISA = 'Y';
+@Y::ISA = 'B';
+
+sub B::AUTOLOAD {
+ my $c = ++$counter;
+ my $method = $B::AUTOLOAD;
+ my $msg = "B: In $method, $c";
+ eval "sub $method { \$msg }";
+ goto &$method;
+}
+sub C::AUTOLOAD {
+ my $c = ++$counter;
+ my $method = $C::AUTOLOAD;
+ my $msg = "C: In $method, $c";
+ eval "sub $method { \$msg }";
+ goto &$method;
+}
+EOF
+
+test(A->e(), "C: In C::e, 1"); # We get a correct autoload
+test(A->e(), "C: In C::e, 1"); # Which sticks
+
+test(A->ee(), "B: In A::ee, 2"); # We get a generic autoload, method in top
+test(A->ee(), "B: In A::ee, 2"); # Which sticks
+
+test(Y->f(), "B: In Y::f, 3"); # We vivify a correct method
+test(Y->f(), "B: In Y::f, 3"); # Which sticks
+
+# This test is not intended to be reasonable. It is here just to let you
+# know that you broke some old construction. Feel free to rewrite the test
+# if your patch breaks it.
+
+*B::AUTOLOAD = sub {
+ my $c = ++$counter;
+ my $method = $AUTOLOAD;
+ *$AUTOLOAD = sub { "new B: In $method, $c" };
+ goto &$AUTOLOAD;
+};
+
+test(A->eee(), "new B: In A::eee, 4"); # We get a correct $autoload
+test(A->eee(), "new B: In A::eee, 4"); # Which sticks
+
+# this test added due to bug discovery
+test(defined(@{"unknown_package::ISA"}) ? "defined" : "undefined", "undefined");
+
+# test that failed subroutine calls don't affect method calls
+{
+ package A1;
+ sub foo { "foo" }
+ package A2;
+ @ISA = 'A1';
+ package main;
+ test(A2->foo(), "foo");
+ test(do { eval 'A2::foo()'; $@ ? 1 : 0}, 1);
+ test(A2->foo(), "foo");
+}
+
+{
+ test(do { use Config; eval 'Config->foo()';
+ $@ =~ /^\QCan't locate object method "foo" via package "Config" at/ ? 1 : $@}, 1);
+ test(do { use Config; eval '$d = bless {}, "Config"; $d->foo()';
+ $@ =~ /^\QCan't locate object method "foo" via package "Config" at/ ? 1 : $@}, 1);
+}
+
+test(do { eval 'E->foo()';
+ $@ =~ /^\QCan't locate object method "foo" via package "E" (perhaps / ? 1 : $@}, 1);
+test(do { eval '$e = bless {}, "E"; $e->foo()';
+ $@ =~ /^\QCan't locate object method "foo" via package "E" (perhaps / ? 1 : $@}, 1);
+