Add test

src/testRunner/unittests/convertToAsyncFunction.ts

@@ -1138,6 +1138,12 @@ const [#|foo|] = function () {
 const foo = function [#|f|]() {
     return fetch('https://typescriptlang.org').then(result => { console.log(result) });
 } 
+`);
+
+    _testConvertToAsyncFunction("convertToAsyncFunction_simpleFunctionExpressionAssignedToBindingPattern", `
+const { length } = [#|function|] () {
+    return fetch('https://typescriptlang.org').then(result => { console.log(result) });
+} 
 `);
 
     _testConvertToAsyncFunction("convertToAsyncFunction_catchBlockUniqueParams", `

tests/baselines/reference/convertToAsyncFunction/convertToAsyncFunction_simpleFunctionExpressionAssignedToBindingPattern.js

@@ -0,0 +1,12 @@
+// ==ORIGINAL==
+
+const { length } = /*[#|*/function/*|]*/ () {
+    return fetch('https://typescriptlang.org').then(result => { console.log(result) });
+} 
+
+// ==ASYNC FUNCTION::Convert to async function==
+
+const { length } = async function () {
+    const result = await fetch('https://typescriptlang.org');
+    console.log(result);
+} 

tests/baselines/reference/convertToAsyncFunction/convertToAsyncFunction_simpleFunctionExpressionAssignedToBindingPattern.ts

@@ -0,0 +1,12 @@
+// ==ORIGINAL==
+
+const { length } = /*[#|*/function/*|]*/ () {
+    return fetch('https://typescriptlang.org').then(result => { console.log(result) });
+} 
+
+// ==ASYNC FUNCTION::Convert to async function==
+
+const { length } = async function () {
+    const result = await fetch('https://typescriptlang.org');
+    console.log(result);
+}