Editorial: use abstract closure in AsyncFromSyncIteratorContinuation (t…

…c39#2439)

spec.html

@@ -38341,17 +38341,6 @@ <h1>%AsyncFromSyncIteratorPrototype%.throw ( [ _value_ ] )</h1>
             1. Return ! AsyncFromSyncIteratorContinuation(_result_, _promiseCapability_).
           </emu-alg>
         </emu-clause>
-
-        <emu-clause id="sec-async-from-sync-iterator-value-unwrap-functions">
-          <h1>Async-from-Sync Iterator Value Unwrap Functions</h1>
-          <p>An async-from-sync iterator value unwrap function is an anonymous built-in function that is used by AsyncFromSyncIteratorContinuation when processing the *"value"* property of an <i>IteratorResult</i> object, in order to wait for its value if it is a promise and re-package the result in a new "unwrapped" <i>IteratorResult</i> object. Each async-from-sync iterator value unwrap function has a [[Done]] internal slot.</p>
-          <p>When an async-from-sync iterator value unwrap function is called with argument _value_, the following steps are taken:</p>
-
-          <emu-alg>
-            1. Let _F_ be the active function object.
-            1. Return ! CreateIterResultObject(_value_, _F_.[[Done]]).
-          </emu-alg>
-        </emu-clause>
       </emu-clause>
 
       <emu-clause id="sec-properties-of-async-from-sync-iterator-instances">
@@ -38383,7 +38372,7 @@ <h1>Properties of Async-from-Sync Iterator Instances</h1>
         </emu-table>
       </emu-clause>
 
-      <emu-clause id="sec-asyncfromsynciteratorcontinuation" aoid="AsyncFromSyncIteratorContinuation">
+      <emu-clause id="sec-asyncfromsynciteratorcontinuation" oldids="sec-async-from-sync-iterator-value-unwrap-functions" aoid="AsyncFromSyncIteratorContinuation">
         <h1>AsyncFromSyncIteratorContinuation ( _result_, _promiseCapability_ )</h1>
         <p>The abstract operation AsyncFromSyncIteratorContinuation takes arguments _result_ and _promiseCapability_ (a PromiseCapability Record). It performs the following steps when called:</p>
 
@@ -38394,10 +38383,10 @@ <h1>AsyncFromSyncIteratorContinuation ( _result_, _promiseCapability_ )</h1>
           1. IfAbruptRejectPromise(_value_, _promiseCapability_).
           1. Let _valueWrapper_ be PromiseResolve(%Promise%, _value_).
           1. IfAbruptRejectPromise(_valueWrapper_, _promiseCapability_).
-          1. Let _steps_ be the algorithm steps defined in <emu-xref href="#sec-async-from-sync-iterator-value-unwrap-functions" title></emu-xref>.
-          1. Let _length_ be the number of non-optional parameters of the function definition in <emu-xref href="#sec-async-from-sync-iterator-value-unwrap-functions" title></emu-xref>.
-          1. Let _onFulfilled_ be ! CreateBuiltinFunction(_steps_, _length_, *""*, &laquo; [[Done]] &raquo;).
-          1. Set _onFulfilled_.[[Done]] to _done_.
+          1. Let _unwrap_ be a new Abstract Closure with parameters (_value_) that captures _done_ and performs the following steps when called:
+            1. Return ! CreateIterResultObject(_value_, _done_).
+          1. Let _onFulfilled_ be ! CreateBuiltinFunction(_unwrap_, 1, *""*, &laquo; &raquo;).
+          1. NOTE: _onFulfilled_ is used when processing the *"value"* property of an IteratorResult object in order to wait for its value if it is a promise and re-package the result in a new "unwrapped" IteratorResult object.
           1. Perform ! PerformPromiseThen(_valueWrapper_, _onFulfilled_, *undefined*, _promiseCapability_).
           1. Return _promiseCapability_.[[Promise]].
         </emu-alg>