Bug Fix Enumerator::Lazy#uniq state for multiple call

* enumerator.c (lazy_uniq_i): create new hash for each calls.
  [Fix GH-1820]

Currently

	2.5.0-preview1 :001 > arr = (0..100).lazy.uniq{|i| i % 10}
	 => #<Enumerator::Lazy: #<Enumerator::Lazy: 0..100>:uniq>
	2.5.0-preview1 :002 > arr.to_a
	 => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
	2.5.0-preview1 :003 > arr.to_a
	 => []

Expected

arr.to_a to always return same output

From: Anmol Chopra <[email protected]>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62731 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 14 insertions, 7 deletions

diff --git a/enumerator.c b/enumerator.c
index ba470a4492..4c20ca08d4 100644
--- a/enumerator.c
+++ b/enumerator.c
@@ -2240,27 +2240,35 @@ lazy_drop_while(VALUE obj)
 }
 
 static VALUE
-lazy_uniq_i(VALUE i, VALUE hash, int argc, const VALUE *argv, VALUE yielder)
+lazy_uniq_i(VALUE i, int argc, const VALUE *argv, VALUE yielder)
 {
+    VALUE hash;
+
+    hash = rb_attr_get(yielder, id_memo);
+    if (NIL_P(hash)) {
+        hash = rb_obj_hide(rb_hash_new());
+        rb_ivar_set(yielder, id_memo, hash);
+    }
+
     if (rb_hash_add_new_element(hash, i, Qfalse))
 	return Qnil;
     return rb_funcallv(yielder, id_yield, argc, argv);
 }
 
 static VALUE
-lazy_uniq_func(RB_BLOCK_CALL_FUNC_ARGLIST(i, hash))
+lazy_uniq_func(RB_BLOCK_CALL_FUNC_ARGLIST(i, m))
 {
     VALUE yielder = (--argc, *argv++);
     i = rb_enum_values_pack(argc, argv);
-    return lazy_uniq_i(i, hash, argc, argv, yielder);
+    return lazy_uniq_i(i, argc, argv, yielder);
 }
 
 static VALUE
-lazy_uniq_iter(RB_BLOCK_CALL_FUNC_ARGLIST(i, hash))
+lazy_uniq_iter(RB_BLOCK_CALL_FUNC_ARGLIST(i, m))
 {
     VALUE yielder = (--argc, *argv++);
     i = rb_yield_values2(argc, argv);
-    return lazy_uniq_i(i, hash, argc, argv, yielder);
+    return lazy_uniq_i(i, argc, argv, yielder);
 }
 
 static VALUE
@@ -2268,9 +2276,8 @@ lazy_uniq(VALUE obj)
 {
     rb_block_call_func *const func =
 	rb_block_given_p() ? lazy_uniq_iter : lazy_uniq_func;
-    VALUE hash = rb_obj_hide(rb_hash_new());
     return lazy_set_method(rb_block_call(rb_cLazy, id_new, 1, &obj,
-					 func, hash),
+					 func, 0),
 			   0, 0);
 }