* array.c (rb_ary_choice): should return nil when the array is

  empty.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@12276 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 2 deletions

diff --git a/array.c b/array.c
index b265d6ac79..42bda2f444 100644
--- a/array.c
+++ b/array.c
@@ -2952,9 +2952,11 @@ rb_ary_shuffle(VALUE ary)
 static VALUE
 rb_ary_choice(VALUE ary)
 {
-    long i = RARRAY_LEN(ary);
-    long j = genrand_real()*i;
+    long i, j;
 
+    i = RARRAY_LEN(ary);
+    if (i == 0) return Qnil;
+    j = genrand_real()*i;
     return RARRAY_PTR(ary)[j];
 }