Editorial: replace [[UnderlyingIterator]] with [[UnderlyingIterators]]

Author: michaelficarra

spec.html

@@ -7185,6 +7185,24 @@ <h1>
       </emu-alg>
     </emu-clause>
 
+    <emu-clause id="sec-iteratorcloseall" type="abstract operation">
+      <h1>
+        IteratorCloseAll (
+          _iters_: a List of Iterator Records,
+          _completion_: a Completion Record,
+        ): a Completion Record
+      </h1>
+      <dl class="header">
+        <dt>skip global checks</dt>
+        <dd>true</dd>
+      </dl>
+      <emu-alg>
+        1. For each element _iter_ of _iters_, in reverse List order, do
+          1. Set _completion_ to Completion(IteratorClose(_iter_, _completion_)).
+        1. Return ? _completion_.
+      </emu-alg>
+    </emu-clause>
+
     <emu-clause id="sec-ifabruptcloseiterator" aoid="IfAbruptCloseIterator">
       <h1>IfAbruptCloseIterator ( _value_, _iteratorRecord_ )</h1>
       <p>IfAbruptCloseIterator is a shorthand for a sequence of algorithm steps that use an Iterator Record. An algorithm step of the form:</p>
@@ -48018,12 +48036,12 @@ <h1>%IteratorHelperPrototype%.next ( )</h1>
           <h1>%IteratorHelperPrototype%.return ( )</h1>
           <emu-alg>
             1. Let _O_ be *this* value.
-            1. Perform ? RequireInternalSlot(_O_, [[UnderlyingIterator]]).
+            1. Perform ? RequireInternalSlot(_O_, [[UnderlyingIterators]]).
             1. Assert: _O_ has a [[GeneratorState]] internal slot.
             1. If _O_.[[GeneratorState]] is ~suspended-start~, then
               1. Set _O_.[[GeneratorState]] to ~completed~.
               1. NOTE: Once a generator enters the completed state it never leaves it and its associated execution context is never resumed. Any execution state associated with _O_ can be discarded at this point.
-              1. Perform ? IteratorClose(_O_.[[UnderlyingIterator]], NormalCompletion(~unused~)).
+              1. Perform ? IteratorCloseAll(_O_.[[UnderlyingIterators]], NormalCompletion(~unused~)).
               1. Return CreateIteratorResultObject(*undefined*, *true*).
             1. Let _C_ be ReturnCompletion(*undefined*).
             1. Return ? GeneratorResumeAbrupt(_O_, _C_, *"Iterator Helper"*).
@@ -48190,8 +48208,8 @@ <h1>Iterator.prototype.drop ( _limit_ )</h1>
                 1. If _value_ is ~done~, return ReturnCompletion(*undefined*).
                 1. Let _completion_ be Completion(Yield(_value_)).
                 1. IfAbruptCloseIterator(_completion_, _iterated_).
-            1. Let _result_ be CreateIteratorFromClosure(_closure_, *"Iterator Helper"*, %IteratorHelperPrototype%, « [[UnderlyingIterator]] »).
-            1. Set _result_.[[UnderlyingIterator]] to _iterated_.
+            1. Let _result_ be CreateIteratorFromClosure(_closure_, *"Iterator Helper"*, %IteratorHelperPrototype%, « [[UnderlyingIterators]] »).
+            1. Set _result_.[[UnderlyingIterators]] to « _iterated_ ».
             1. Return _result_.
           </emu-alg>
         </emu-clause>
@@ -48240,8 +48258,8 @@ <h1>Iterator.prototype.filter ( _predicate_ )</h1>
                   1. Let _completion_ be Completion(Yield(_value_)).
                   1. IfAbruptCloseIterator(_completion_, _iterated_).
                 1. Set _counter_ to _counter_ + 1.
-            1. Let _result_ be CreateIteratorFromClosure(_closure_, *"Iterator Helper"*, %IteratorHelperPrototype%, « [[UnderlyingIterator]] »).
-            1. Set _result_.[[UnderlyingIterator]] to _iterated_.
+            1. Let _result_ be CreateIteratorFromClosure(_closure_, *"Iterator Helper"*, %IteratorHelperPrototype%, « [[UnderlyingIterators]] »).
+            1. Set _result_.[[UnderlyingIterators]] to « _iterated_ ».
             1. Return _result_.
           </emu-alg>
         </emu-clause>
@@ -48301,8 +48319,8 @@ <h1>Iterator.prototype.flatMap ( _mapper_ )</h1>
                       1. IfAbruptCloseIterator(_backupCompletion_, _iterated_).
                       1. Return ? IteratorClose(_iterated_, _completion_).
                 1. Set _counter_ to _counter_ + 1.
-            1. Let _result_ be CreateIteratorFromClosure(_closure_, *"Iterator Helper"*, %IteratorHelperPrototype%, « [[UnderlyingIterator]] »).
-            1. Set _result_.[[UnderlyingIterator]] to _iterated_.
+            1. Let _result_ be CreateIteratorFromClosure(_closure_, *"Iterator Helper"*, %IteratorHelperPrototype%, « [[UnderlyingIterators]] »).
+            1. Set _result_.[[UnderlyingIterators]] to « _iterated_ ».
             1. Return _result_.
           </emu-alg>
         </emu-clause>
@@ -48349,8 +48367,8 @@ <h1>Iterator.prototype.map ( _mapper_ )</h1>
                 1. Let _completion_ be Completion(Yield(_mapped_)).
                 1. IfAbruptCloseIterator(_completion_, _iterated_).
                 1. Set _counter_ to _counter_ + 1.
-            1. Let _result_ be CreateIteratorFromClosure(_closure_, *"Iterator Helper"*, %IteratorHelperPrototype%, « [[UnderlyingIterator]] »).
-            1. Set _result_.[[UnderlyingIterator]] to _iterated_.
+            1. Let _result_ be CreateIteratorFromClosure(_closure_, *"Iterator Helper"*, %IteratorHelperPrototype%, « [[UnderlyingIterators]] »).
+            1. Set _result_.[[UnderlyingIterators]] to « _iterated_ ».
             1. Return _result_.
           </emu-alg>
         </emu-clause>
@@ -48433,8 +48451,8 @@ <h1>Iterator.prototype.take ( _limit_ )</h1>
                 1. If _value_ is ~done~, return ReturnCompletion(*undefined*).
                 1. Let _completion_ be Completion(Yield(_value_)).
                 1. IfAbruptCloseIterator(_completion_, _iterated_).
-            1. Let _result_ be CreateIteratorFromClosure(_closure_, *"Iterator Helper"*, %IteratorHelperPrototype%, « [[UnderlyingIterator]] »).
-            1. Set _result_.[[UnderlyingIterator]] to _iterated_.
+            1. Let _result_ be CreateIteratorFromClosure(_closure_, *"Iterator Helper"*, %IteratorHelperPrototype%, « [[UnderlyingIterators]] »).
+            1. Set _result_.[[UnderlyingIterators]] to « _iterated_ ».
             1. Return _result_.
           </emu-alg>
         </emu-clause>