1 files changed, 19 insertions, 10 deletions
diff --git a/range.c b/range.c
index ce2df63100..e013a8a13f 100644
--- a/range.c
+++ b/range.c
@@ -201,21 +201,15 @@ range_eql(VALUE range, VALUE obj)
     return Qtrue;
 }
 
-/*
- * call-seq:
- *   rng.hash    => fixnum
- *
- * Generate a hash value such that two ranges with the same start and
- * end points, and the same value for the "exclude end" flag, generate
- * the same hash value.
- */
-
 static VALUE
-range_hash(VALUE range)
+recursive_hash(VALUE range, VALUE dummy, int recur)
 {
     unsigned long hash = EXCL(range);
     VALUE v;
 
+    if (recur) {
+        rb_raise(rb_eArgError, "recursive key for hash");
+    }
     hash = rb_hash_start(hash);
     v = rb_hash(RANGE_BEG(range));
     hash = rb_hash_uint(hash, NUM2LONG(v));
@@ -227,6 +221,21 @@ range_hash(VALUE range)
     return LONG2FIX(hash);
 }
 
+/*
+ * call-seq:
+ *   rng.hash    => fixnum
+ *
+ * Generate a hash value such that two ranges with the same start and
+ * end points, and the same value for the "exclude end" flag, generate
+ * the same hash value.
+ */
+
+static VALUE
+range_hash(VALUE range)
+{
+    return rb_exec_recursive(recursive_hash, range, 0);
+}
+
 static void
 range_each_func(VALUE range, VALUE (*func) (VALUE, void *), void *arg)
 {