regex: bugfix: squash duplicates in move set.

* regex.c (nfa_move_closure): The move set calculation
is wrongly assuming that all of the states are new and not
testing their visited color. This could result in the
same state being added twice. Though harmless, it wastefully
inflates the set size.

1 files changed, 1 insertions, 2 deletions

diff --git a/regex.c b/regex.c
index 61cef2e6..314110f7 100644
--- a/regex.c
+++ b/regex.c
@@ -1351,8 +1351,7 @@ static int nfa_move_closure(nfa_state_t **stack, nfa_state_t **set, int nin,
 
       bug_unless (stackp < nstates);
 
-      if (mov != 0) {
-        mov->a.visited = visited;
+      if (nfa_test_set_visited(mov, visited)) {
         stack[stackp++] = mov;
         set[nout++] = mov;
         if (nfa_accept_state_p(mov))