8 has of => (is => 'ro', required => 1);
9 has name => (is => 'ro', required => 1);
10 has value => (is => 'ro', required => 1);
13 my ($self, $state) = @_;
14 ($state, my %args) = $self->_expand_args(
15 $state, map +($_ => $self->$_), qw(of name value)
17 die "property name must be bound" unless $args{name}->is_bound;
18 my $name = $state->resolve_value($args{name});
19 if ($args{of}->is_bound) {
20 if ($args{value}->is_bound) {
21 if ($state->resolve_value($args{of})->$name
22 eq $state->resolve_value($args{value})) {
23 return $state->add_dependencies(
24 $args{of}->id => $args{value}->id,
25 $args{value}->id => $args{of}->id,
29 return $state->backtrack;
31 my $value = $state->resolve_value($args{of});
32 if ($value->can("has_${name}") and not $value->${\"has_${name}"}) {
33 return $state->backtrack;
35 my $var_ref = DX::VarRef->new(var_id => $args{of}->id, derive => $name);
36 return $state->bind_value($args{value}->id, $var_ref)
37 ->add_dependencies($args{value}->id => $args{of}->id)
40 die "Can't yet handle unbound 'of' argument";