Re: [whatwg/streams] ReadableStream.from(asyncIterable) (#1083)

@ricea commented on this pull request.



> +  let stream;
+  const iteratorRecord = GetIterator(asyncIterable, 'async');
+
+  const startAlgorithm = () => undefined;
+
+  function pullAlgorithm() {
+    let nextResult;
+    try {
+      nextResult = IteratorNext(iteratorRecord);
+    } catch (e) {
+      return promiseRejectedWith(e);
+    }
+    const nextPromise = promiseResolvedWith(nextResult);
+    return transformPromiseWith(nextPromise, iterResult => {
+      if (!typeIsObject(iterResult)) {
+        throw new TypeError();

Please give the exceptions a message to help us grep for them when debugging.

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