fix previous commit.

don't use FL_USER0 because FL_SINGLETON.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@9896 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ruby.h

@@ -428,11 +428,12 @@ struct RStruct {
 	VALUE ary[RSTRUCT_EMBED_LEN_MAX];
     } as;
 };
-#define RSTRUCT_EMBED_LEN_MASK (FL_USER1|FL_USER0)
-#define RSTRUCT_EMBED_LEN_SHIFT FL_USHIFT
+#define RSTRUCT_EMBED_LEN_MASK (FL_USER2|FL_USER1)
+#define RSTRUCT_EMBED_LEN_SHIFT FL_USHIFT+1
 #define RSTRUCT_LEN(st) \
     ((RBASIC(st)->flags & RSTRUCT_EMBED_LEN_MASK) ? \
-     (RBASIC(st)->flags >> RSTRUCT_EMBED_LEN_SHIFT) & 3 : \
+     (RBASIC(st)->flags >> RSTRUCT_EMBED_LEN_SHIFT) & \
+     (RSTRUCT_EMBED_LEN_MASK >> RSTRUCT_EMBED_LEN_SHIFT) : \
      RSTRUCT(st)->as.heap.len)
 #define RSTRUCT_PTR(st) \
     ((RBASIC(st)->flags & RSTRUCT_EMBED_LEN_MASK) ? \