regex: Merge the `types` array as well.

* nfa/src/default/regex.rs: Previously when merging regular
  expressoins, only the graphs are merged, but the `types` array
  stayed unchanged.  This caused errors of indices being out of
  bounds.

1 files changed, 2 insertions, 0 deletions

diff --git a/nfa/src/default/regex.rs b/nfa/src/default/regex.rs
index 9b5fab1..8185ca5 100644
--- a/nfa/src/default/regex.rs
+++ b/nfa/src/default/regex.rs
@@ -558,6 +558,8 @@ impl<T: GraphLabel> DefaultRegex<T> {
 
             builder_mut.append(other.graph);
 
+            self.types.extend(other.types);
+
             if let Some(root) = self.root {
                 // Deliberately ignore errors here.
                 let _ = builder_mut.add_edge(root, old_len, ());