* enum.c (enum_inject): default the result value to Qundef to use

  first element as initial value if not given.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@8603 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 1 deletions

diff --git a/enum.c b/enum.c
index 00d7a58a7e..25432dc99a 100644
--- a/enum.c
+++ b/enum.c
@@ -305,8 +305,10 @@ enum_inject(argc, argv, obj)
 {
     VALUE memo = Qundef;
 
-    rb_scan_args(argc, argv, "01", &memo);
+    if (rb_scan_args(argc, argv, "01", &memo) == 0)
+	memo = Qundef;
     rb_iterate(rb_each, obj, inject_i, (VALUE)&memo);
+    if (memo == Qundef) return Qnil;
     return memo;
 }