rb_int_range_last: properly handle non-exclusive range

[Bug #18994]

1 files changed, 4 insertions, 4 deletions

diff --git a/range.c b/range.c
index 39786ed97c..b49b1bd79c 100644
--- a/range.c
+++ b/range.c
@@ -1107,10 +1107,6 @@ rb_int_range_last(int argc, VALUE *argv, VALUE range)
     x = EXCL(range);
 
     len_1 = rb_int_minus(e, b);
-    if (FIXNUM_ZERO_P(len_1) || rb_num_negative_p(len_1)) {
-        return rb_ary_new_capa(0);
-    }
-
     if (x) {
         e = rb_int_minus(e, ONE);
         len = len_1;
@@ -1119,6 +1115,10 @@ rb_int_range_last(int argc, VALUE *argv, VALUE range)
         len = rb_int_plus(len_1, ONE);
     }
 
+    if (FIXNUM_ZERO_P(len) || rb_num_negative_p(len)) {
+        return rb_ary_new_capa(0);
+    }
+
     rb_scan_args(argc, argv, "1", &nv);
     n = NUM2LONG(nv);
     if (n < 0) {