[Bug #19769] Fix range of size 1 in `String#tr`

1 files changed, 4 insertions, 2 deletions

diff --git a/string.c b/string.c
index af0668e4b2..9cc4dfd3ce 100644
--- a/string.c
+++ b/string.c
@@ -7714,8 +7714,10 @@ trnext(struct tr *t, rb_encoding *enc)
                         }
                         continue; /* not reached */
                     }
-                    t->gen = 1;
-                    t->max = c;
+                    else if (t->now < c) {
+                        t->gen = 1;
+                        t->max = c;
+                    }
                 }
             }
             return t->now;