merges r21424 from trunk into ruby_1_9_1.

* hash.c (rb_hash_s_create): set nil as the value if assoc length
  is not enough.  [ruby-core:21249]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@21459 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 3 deletions

diff --git a/hash.c b/hash.c
index a058a00a91..4c78122a02 100644
--- a/hash.c
+++ b/hash.c
@@ -348,10 +348,16 @@ rb_hash_s_create(int argc, VALUE *argv, VALUE klass)
 	    hash = hash_alloc(klass);
 	    for (i = 0; i < RARRAY_LEN(tmp); ++i) {
 		VALUE v = rb_check_array_type(RARRAY_PTR(tmp)[i]);
-		
+		VALUE key, val = Qnil;
+
 		if (NIL_P(v)) continue;
-		if (RARRAY_LEN(v) < 1 || 2 < RARRAY_LEN(v)) continue;
-		rb_hash_aset(hash, RARRAY_PTR(v)[0], RARRAY_PTR(v)[1]);
+		switch (RARRAY_LEN(v)) {
+		  case 2:
+		    val = RARRAY_PTR(v)[1];
+		  case 1:
+		    key = RARRAY_PTR(v)[0];
+		    rb_hash_aset(hash, key, val);
+		}
 	    }
 	    return hash;
 	}