record all adjustments, even those without alternatives

[scpubgit/DX.git] / lib / DX / Step / Backtrack.pm

diff --git a/lib/DX/Step/Backtrack.pm b/lib/DX/Step/Backtrack.pm
index f145351..047b693 100644 (file)
--- a/lib/DX/Step/Backtrack.pm
+++ b/lib/DX/Step/Backtrack.pm
@@ -6,9 +6,13 @@ with 'DX::Role::Step';
 
 sub apply_to {
   my ($self, $ss) = @_;
-  my ($first_alt, @rest_alt) = @{$ss->adjustments_made};
-  return $ss->but(next_step => $ss->on_exhaustion_step) unless $first_alt;
-  return $first_alt->[1]->but(next_step => $first_alt->[0]->alternative_step);
+  foreach my $adj (@{$ss->adjustments_made}) {
+    my ($step_was, $ss_was) = @$adj;
+    if (my $alt = $step_was->alternative_step) {
+      return $ss_was->but(next_step => $alt);
+    }
+  }
+  return $ss->but(next_step => $ss->on_exhaustion_step);
 }
 
 1;