1 package DX::Step::Backtrack;
9 my ($first_alt, @rest_alt) = @{$ss->alternatives};
10 return $ss->but(next_step => $ss->on_exhaustion_step) unless $first_alt;
11 trace 'search.backtrack.rewind_to' => $first_alt->[1];
13 current_hypothesis => $first_alt->[0],
14 alternatives => \@rest_alt,
15 next_step => $first_alt->[1],