my $new_hyp = $self->_apply_to_hyp($old_hyp);
return $ss->but(next_step => DX::Step::Backtrack->new) unless $new_hyp;
trace 'step.apply.new_hyp '.$self => $new_hyp;
- my $ns = DX::Step::InvokeNextPredicate->new(
- proposition => $ss->next_proposition($new_hyp)
- );
+ my $ns = do {
+ if (my $prop = $ss->next_proposition($new_hyp)) {
+ DX::Step::InvokeNextPredicate->new(
+ proposition => $prop
+ )
+ } else {
+ $ss->on_solution_step
+ }
+ };
my $alt_step = $self->alternative_step;
return (
$ss->but(