Dynamic Imports: initial cases, templates, non-generated tests and fixtures

features.txt

@@ -30,6 +30,10 @@ class-static-methods-private
 # https://github.com/tc39/proposal-private-methods
 class-methods-private
 
+# Dynamic Import
+# https://github.com/tc39/proposal-dynamic-import
+dynamic-import
+
 # Promise.prototype.finally
 # https://github.com/tc39/proposal-promise-finally
 Promise.prototype.finally

src/dynamic-import/catch/nested-arrow.template

+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/module-code/dynamic-import/catch-nested-arrow-import-catch-
+name: nested arrow
+esid: sec-import-call-runtime-semantics-evaluation
+info: |
+  ImportCall :
+      import( AssignmentExpression )
+
+  1. Let referencingScriptOrModule be ! GetActiveScriptOrModule().
+  2. Assert: referencingScriptOrModule is a Script Record or Module Record (i.e. is not null).
+  3. Let argRef be the result of evaluating AssignmentExpression.
+  4. Let specifier be ? GetValue(argRef).
+  5. Let promiseCapability be ! NewPromiseCapability(%Promise%).
+  6. Let specifierString be ToString(specifier).
+  7. IfAbruptRejectPromise(specifierString, promiseCapability).
+  8. Perform ! HostImportModuleDynamically(referencingScriptOrModule, specifierString, promiseCapability).
+  9. Return promiseCapability.[[Promise]].
+
+flags: [module]
+features: [dynamic-import]
+---*/
+
+let f = () => {
+  import(/*{ params }*/).catch(error => {
+
+    /*{ body }*/
+
+  }).then($DONE, $DONE);
+};
+
+f();

src/dynamic-import/catch/nested-async-function-await.template

+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/module-code/dynamic-import/catch-nested-async-function-await-
+name: nested in async function, awaited
+esid: sec-import-call-runtime-semantics-evaluation
+info: |
+  ImportCall :
+      import( AssignmentExpression )
+
+  1. Let referencingScriptOrModule be ! GetActiveScriptOrModule().
+  2. Assert: referencingScriptOrModule is a Script Record or Module Record (i.e. is not null).
+  3. Let argRef be the result of evaluating AssignmentExpression.
+  4. Let specifier be ? GetValue(argRef).
+  5. Let promiseCapability be ! NewPromiseCapability(%Promise%).
+  6. Let specifierString be ToString(specifier).
+  7. IfAbruptRejectPromise(specifierString, promiseCapability).
+  8. Perform ! HostImportModuleDynamically(referencingScriptOrModule, specifierString, promiseCapability).
+  9. Return promiseCapability.[[Promise]].
+
+flags: [module]
+features: [dynamic-import]
+---*/
+
+async function f() {
+  await import(/*{ params }*/).catch(error => {
+
+    /*{ body }*/
+
+  }).then($DONE, $DONE);
+}
+
+f();

src/dynamic-import/catch/nested-async-function-return-await.template

+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/module-code/dynamic-import/catch-nested-async-function-return-await-
+name: nested in async function, returns awaited
+esid: sec-import-call-runtime-semantics-evaluation
+info: |
+  ImportCall :
+      import( AssignmentExpression )
+
+  1. Let referencingScriptOrModule be ! GetActiveScriptOrModule().
+  2. Assert: referencingScriptOrModule is a Script Record or Module Record (i.e. is not null).
+  3. Let argRef be the result of evaluating AssignmentExpression.
+  4. Let specifier be ? GetValue(argRef).
+  5. Let promiseCapability be ! NewPromiseCapability(%Promise%).
+  6. Let specifierString be ToString(specifier).
+  7. IfAbruptRejectPromise(specifierString, promiseCapability).
+  8. Perform ! HostImportModuleDynamically(referencingScriptOrModule, specifierString, promiseCapability).
+  9. Return promiseCapability.[[Promise]].
+
+flags: [module]
+features: [dynamic-import]
+---*/
+
+async function f() {
+  return await import(/*{ params }*/).catch(error => {
+
+    /*{ body }*/
+
+  }).then($DONE, $DONE);
+}
+
+f();

src/dynamic-import/catch/nested-async-function.template

+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/module-code/dynamic-import/catch-nested-async-function-
+name: nested in async function
+esid: sec-import-call-runtime-semantics-evaluation
+info: |
+  ImportCall :
+      import( AssignmentExpression )
+
+  1. Let referencingScriptOrModule be ! GetActiveScriptOrModule().
+  2. Assert: referencingScriptOrModule is a Script Record or Module Record (i.e. is not null).
+  3. Let argRef be the result of evaluating AssignmentExpression.
+  4. Let specifier be ? GetValue(argRef).
+  5. Let promiseCapability be ! NewPromiseCapability(%Promise%).
+  6. Let specifierString be ToString(specifier).
+  7. IfAbruptRejectPromise(specifierString, promiseCapability).
+  8. Perform ! HostImportModuleDynamically(referencingScriptOrModule, specifierString, promiseCapability).
+  9. Return promiseCapability.[[Promise]].
+
+flags: [module]
+features: [dynamic-import]
+---*/
+
+async function f() {
+  import(/*{ params }*/).catch(error => {
+
+    /*{ body }*/
+
+  }).then($DONE, $DONE);
+}
+
+f();
+

src/dynamic-import/catch/nested-block-labeled.template

+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/module-code/dynamic-import/catch-nested-block-labeled-
+name: nested block syntax
+esid: sec-import-call-runtime-semantics-evaluation
+info: |
+  ImportCall :
+      import( AssignmentExpression )
+
+  1. Let referencingScriptOrModule be ! GetActiveScriptOrModule().
+  2. Assert: referencingScriptOrModule is a Script Record or Module Record (i.e. is not null).
+  3. Let argRef be the result of evaluating AssignmentExpression.
+  4. Let specifier be ? GetValue(argRef).
+  5. Let promiseCapability be ! NewPromiseCapability(%Promise%).
+  6. Let specifierString be ToString(specifier).
+  7. IfAbruptRejectPromise(specifierString, promiseCapability).
+  8. Perform ! HostImportModuleDynamically(referencingScriptOrModule, specifierString, promiseCapability).
+  9. Return promiseCapability.[[Promise]].
+
+flags: [module]
+features: [dynamic-import]
+---*/
+
+label: {
+  import(/*{ params }*/).catch(error => {
+
+    /*{ body }*/
+
+  }).then($DONE, $DONE);
+};

src/dynamic-import/catch/nested-block.template

+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/module-code/dynamic-import/catch-nested-block-import-catch-
+name: nested block
+esid: sec-import-call-runtime-semantics-evaluation
+info: |
+  ImportCall :
+      import( AssignmentExpression )
+
+  1. Let referencingScriptOrModule be ! GetActiveScriptOrModule().
+  2. Assert: referencingScriptOrModule is a Script Record or Module Record (i.e. is not null).
+  3. Let argRef be the result of evaluating AssignmentExpression.
+  4. Let specifier be ? GetValue(argRef).
+  5. Let promiseCapability be ! NewPromiseCapability(%Promise%).
+  6. Let specifierString be ToString(specifier).
+  7. IfAbruptRejectPromise(specifierString, promiseCapability).
+  8. Perform ! HostImportModuleDynamically(referencingScriptOrModule, specifierString, promiseCapability).
+  9. Return promiseCapability.[[Promise]].
+
+flags: [module]
+features: [dynamic-import]
+---*/
+
+{
+  import(/*{ params }*/).catch(error => {
+
+    /*{ body }*/
+
+  }).then($DONE, $DONE);
+};

src/dynamic-import/catch/nested-do-while.template

+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/module-code/dynamic-import/catch-nested-do-while-
+name: nested do syntax
+esid: sec-import-call-runtime-semantics-evaluation
+info: |
+  ImportCall :
+      import( AssignmentExpression )
+
+  1. Let referencingScriptOrModule be ! GetActiveScriptOrModule().
+  2. Assert: referencingScriptOrModule is a Script Record or Module Record (i.e. is not null).
+  3. Let argRef be the result of evaluating AssignmentExpression.
+  4. Let specifier be ? GetValue(argRef).
+  5. Let promiseCapability be ! NewPromiseCapability(%Promise%).
+  6. Let specifierString be ToString(specifier).
+  7. IfAbruptRejectPromise(specifierString, promiseCapability).
+  8. Perform ! HostImportModuleDynamically(referencingScriptOrModule, specifierString, promiseCapability).
+  9. Return promiseCapability.[[Promise]].
+
+flags: [module]
+features: [dynamic-import]
+---*/
+
+do {
+  import(/*{ params }*/).catch(error => {
+
+    /*{ body }*/
+
+  }).then($DONE, $DONE);
+} while (false);

src/dynamic-import/catch/nested-do.template

+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/module-code/dynamic-import/catch-nested-do-import-catch-
+name: nested do
+esid: sec-import-call-runtime-semantics-evaluation
+info: |
+  ImportCall :
+      import( AssignmentExpression )
+
+  1. Let referencingScriptOrModule be ! GetActiveScriptOrModule().
+  2. Assert: referencingScriptOrModule is a Script Record or Module Record (i.e. is not null).
+  3. Let argRef be the result of evaluating AssignmentExpression.
+  4. Let specifier be ? GetValue(argRef).
+  5. Let promiseCapability be ! NewPromiseCapability(%Promise%).
+  6. Let specifierString be ToString(specifier).
+  7. IfAbruptRejectPromise(specifierString, promiseCapability).
+  8. Perform ! HostImportModuleDynamically(referencingScriptOrModule, specifierString, promiseCapability).
+  9. Return promiseCapability.[[Promise]].
+
+flags: [module]
+features: [dynamic-import]
+---*/
+
+let x = 0;
+do {
+  x++;
+  import(/*{ params }*/).catch(error => {
+
+    /*{ body }*/
+
+  }).then($DONE, $DONE);
+} while (!x);

src/dynamic-import/catch/nested-else.template

+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/module-code/dynamic-import/catch-nested-else-import-catch-
+name: nested else
+esid: sec-import-call-runtime-semantics-evaluation
+info: |
+  ImportCall :
+      import( AssignmentExpression )
+
+  1. Let referencingScriptOrModule be ! GetActiveScriptOrModule().
+  2. Assert: referencingScriptOrModule is a Script Record or Module Record (i.e. is not null).
+  3. Let argRef be the result of evaluating AssignmentExpression.
+  4. Let specifier be ? GetValue(argRef).
+  5. Let promiseCapability be ! NewPromiseCapability(%Promise%).
+  6. Let specifierString be ToString(specifier).
+  7. IfAbruptRejectPromise(specifierString, promiseCapability).
+  8. Perform ! HostImportModuleDynamically(referencingScriptOrModule, specifierString, promiseCapability).
+  9. Return promiseCapability.[[Promise]].
+
+flags: [module]
+features: [dynamic-import]
+---*/
+
+if (false) {
+
+} else {
+  import(/*{ params }*/).catch(error => {
+
+    /*{ body }*/
+
+  }).then($DONE, $DONE);
+}

src/dynamic-import/catch/nested-function.template

+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/module-code/dynamic-import/catch-nested-function-import-catch-
+name: nested function
+esid: sec-import-call-runtime-semantics-evaluation
+info: |
+  ImportCall :
+      import( AssignmentExpression )
+
+  1. Let referencingScriptOrModule be ! GetActiveScriptOrModule().
+  2. Assert: referencingScriptOrModule is a Script Record or Module Record (i.e. is not null).
+  3. Let argRef be the result of evaluating AssignmentExpression.
+  4. Let specifier be ? GetValue(argRef).
+  5. Let promiseCapability be ! NewPromiseCapability(%Promise%).
+  6. Let specifierString be ToString(specifier).
+  7. IfAbruptRejectPromise(specifierString, promiseCapability).
+  8. Perform ! HostImportModuleDynamically(referencingScriptOrModule, specifierString, promiseCapability).
+  9. Return promiseCapability.[[Promise]].
+
+flags: [module]
+features: [dynamic-import]
+---*/
+
+function f() {
+  import(/*{ params }*/).catch(error => {
+
+    /*{ body }*/
+
+  }).then($DONE, $DONE);
+}
+f();

src/dynamic-import/catch/nested-if.template

+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/module-code/dynamic-import/catch-nested-if-import-catch-
+name: nested if
+esid: sec-import-call-runtime-semantics-evaluation
+info: |
+  ImportCall :
+      import( AssignmentExpression )
+
+  1. Let referencingScriptOrModule be ! GetActiveScriptOrModule().
+  2. Assert: referencingScriptOrModule is a Script Record or Module Record (i.e. is not null).
+  3. Let argRef be the result of evaluating AssignmentExpression.
+  4. Let specifier be ? GetValue(argRef).
+  5. Let promiseCapability be ! NewPromiseCapability(%Promise%).
+  6. Let specifierString be ToString(specifier).
+  7. IfAbruptRejectPromise(specifierString, promiseCapability).
+  8. Perform ! HostImportModuleDynamically(referencingScriptOrModule, specifierString, promiseCapability).
+  9. Return promiseCapability.[[Promise]].
+
+flags: [module]
+features: [dynamic-import]
+---*/
+
+if (true) {
+  import(/*{ params }*/).catch(error => {
+
+    /*{ body }*/
+
+  }).then($DONE, $DONE);
+}

src/dynamic-import/catch/nested-labeled-block.template

+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/module-code/dynamic-import/catch-nested-labeled-block-import-catch-
+name: nested labeled block
+esid: sec-import-call-runtime-semantics-evaluation
+info: |
+  ImportCall :
+      import( AssignmentExpression )
+
+  1. Let referencingScriptOrModule be ! GetActiveScriptOrModule().
+  2. Assert: referencingScriptOrModule is a Script Record or Module Record (i.e. is not null).
+  3. Let argRef be the result of evaluating AssignmentExpression.
+  4. Let specifier be ? GetValue(argRef).
+  5. Let promiseCapability be ! NewPromiseCapability(%Promise%).
+  6. Let specifierString be ToString(specifier).
+  7. IfAbruptRejectPromise(specifierString, promiseCapability).
+  8. Perform ! HostImportModuleDynamically(referencingScriptOrModule, specifierString, promiseCapability).
+  9. Return promiseCapability.[[Promise]].
+
+flags: [module]
+features: [dynamic-import]
+---*/
+
+{
+  import(/*{ params }*/).catch(error => {
+
+    /*{ body }*/
+
+  }).then($DONE, $DONE);
+};

src/dynamic-import/catch/nested-while.template

+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/module-code/dynamic-import/catch-nested-while-import-catch-
+name: nested while
+esid: sec-import-call-runtime-semantics-evaluation
+info: |
+  ImportCall :
+      import( AssignmentExpression )
+
+  1. Let referencingScriptOrModule be ! GetActiveScriptOrModule().
+  2. Assert: referencingScriptOrModule is a Script Record or Module Record (i.e. is not null).
+  3. Let argRef be the result of evaluating AssignmentExpression.
+  4. Let specifier be ? GetValue(argRef).
+  5. Let promiseCapability be ! NewPromiseCapability(%Promise%).
+  6. Let specifierString be ToString(specifier).
+  7. IfAbruptRejectPromise(specifierString, promiseCapability).
+  8. Perform ! HostImportModuleDynamically(referencingScriptOrModule, specifierString, promiseCapability).
+  9. Return promiseCapability.[[Promise]].
+
+flags: [module]
+features: [dynamic-import]
+---*/
+
+let x = 0;
+while (!x) {
+  x++;
+  import(/*{ params }*/).catch(error => {
+
+    /*{ body }*/
+
+  }).then($DONE, $DONE);
+};

src/dynamic-import/catch/top-level.template

+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/module-code/dynamic-import/catch-top-level-import-catch-
+name: top level
+esid: sec-import-call-runtime-semantics-evaluation
+info: |
+  ImportCall :
+      import( AssignmentExpression )
+
+  1. Let referencingScriptOrModule be ! GetActiveScriptOrModule().
+  2. Assert: referencingScriptOrModule is a Script Record or Module Record (i.e. is not null).
+  3. Let argRef be the result of evaluating AssignmentExpression.
+  4. Let specifier be ? GetValue(argRef).
+  5. Let promiseCapability be ! NewPromiseCapability(%Promise%).
+  6. Let specifierString be ToString(specifier).
+  7. IfAbruptRejectPromise(specifierString, promiseCapability).
+  8. Perform ! HostImportModuleDynamically(referencingScriptOrModule, specifierString, promiseCapability).
+  9. Return promiseCapability.[[Promise]].
+
+flags: [module]
+features: [dynamic-import]
+---*/
+
+import(/*{ params }*/).catch(error => {
+
+  /*{ body }*/
+
+}).then($DONE, $DONE);

src/dynamic-import/default/nested-arrow-assignment-expression.template

+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/module-code/dynamic-import/nested-arrow-assignment-expression-
+name: nested arrow
+esid: sec-import-call-runtime-semantics-evaluation
+info: |
+  ImportCall :
+      import( AssignmentExpression )
+
+  1. Let referencingScriptOrModule be ! GetActiveScriptOrModule().
+  2. Assert: referencingScriptOrModule is a Script Record or Module Record (i.e. is not null).
+  3. Let argRef be the result of evaluating AssignmentExpression.
+  4. Let specifier be ? GetValue(argRef).
+  5. Let promiseCapability be ! NewPromiseCapability(%Promise%).
+  6. Let specifierString be ToString(specifier).
+  7. IfAbruptRejectPromise(specifierString, promiseCapability).
+  8. Perform ! HostImportModuleDynamically(referencingScriptOrModule, specifierString, promiseCapability).
+  9. Return promiseCapability.[[Promise]].
+
+flags: [module]
+features: [dynamic-import]
+---*/
+
+let f = () => import(/*{ params }*/).then(imported => {
+
+  /*{ body }*/
+
+});
+
+
+f().then($DONE, $DONE).catch($DONE);

src/dynamic-import/default/nested-arrow.template

+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/module-code/dynamic-import/nested-arrow-import-then-
+name: nested arrow
+esid: sec-import-call-runtime-semantics-evaluation
+info: |
+  ImportCall :
+      import( AssignmentExpression )
+
+  1. Let referencingScriptOrModule be ! GetActiveScriptOrModule().
+  2. Assert: referencingScriptOrModule is a Script Record or Module Record (i.e. is not null).
+  3. Let argRef be the result of evaluating AssignmentExpression.
+  4. Let specifier be ? GetValue(argRef).
+  5. Let promiseCapability be ! NewPromiseCapability(%Promise%).
+  6. Let specifierString be ToString(specifier).
+  7. IfAbruptRejectPromise(specifierString, promiseCapability).
+  8. Perform ! HostImportModuleDynamically(referencingScriptOrModule, specifierString, promiseCapability).
+  9. Return promiseCapability.[[Promise]].
+
+flags: [module]
+features: [dynamic-import]
+---*/
+
+let f = () => {
+  return import(/*{ params }*/).then(imported => {
+
+    /*{ body }*/
+
+  }).then($DONE, $DONE).catch($DONE);
+};
+
+f();
+

src/dynamic-import/default/nested-async-function-await.template

+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/module-code/dynamic-import/nested-async-function-await-
+name: nested in async function, awaited
+esid: sec-import-call-runtime-semantics-evaluation
+info: |
+  ImportCall :
+      import( AssignmentExpression )
+
+  1. Let referencingScriptOrModule be ! GetActiveScriptOrModule().
+  2. Assert: referencingScriptOrModule is a Script Record or Module Record (i.e. is not null).
+  3. Let argRef be the result of evaluating AssignmentExpression.
+  4. Let specifier be ? GetValue(argRef).
+  5. Let promiseCapability be ! NewPromiseCapability(%Promise%).
+  6. Let specifierString be ToString(specifier).
+  7. IfAbruptRejectPromise(specifierString, promiseCapability).
+  8. Perform ! HostImportModuleDynamically(referencingScriptOrModule, specifierString, promiseCapability).
+  9. Return promiseCapability.[[Promise]].
+
+flags: [module]
+features: [dynamic-import]
+---*/
+
+async function f() {
+  await import(/*{ params }*/).then(imported => {
+
+    /*{ body }*/
+
+  }).then($DONE, $DONE).catch($DONE);
+}
+
+f();

src/dynamic-import/default/nested-async-function-return-await.template

+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/module-code/dynamic-import/nested-async-function-return-await-
+name: nested in async function, returns awaited
+esid: sec-import-call-runtime-semantics-evaluation
+info: |
+  ImportCall :
+      import( AssignmentExpression )
+
+  1. Let referencingScriptOrModule be ! GetActiveScriptOrModule().
+  2. Assert: referencingScriptOrModule is a Script Record or Module Record (i.e. is not null).
+  3. Let argRef be the result of evaluating AssignmentExpression.
+  4. Let specifier be ? GetValue(argRef).
+  5. Let promiseCapability be ! NewPromiseCapability(%Promise%).
+  6. Let specifierString be ToString(specifier).
+  7. IfAbruptRejectPromise(specifierString, promiseCapability).
+  8. Perform ! HostImportModuleDynamically(referencingScriptOrModule, specifierString, promiseCapability).
+  9. Return promiseCapability.[[Promise]].
+
+flags: [module]
+features: [dynamic-import]
+---*/
+
+async function f() {
+  return await import(/*{ params }*/).then(imported => {
+
+    /*{ body }*/
+
+  }).then($DONE, $DONE).catch($DONE);
+}
+
+f();

src/dynamic-import/default/nested-async-function.template

+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/module-code/dynamic-import/nested-async-function-
+name: nested in async function
+esid: sec-import-call-runtime-semantics-evaluation
+info: |
+  ImportCall :
+      import( AssignmentExpression )
+
+  1. Let referencingScriptOrModule be ! GetActiveScriptOrModule().
+  2. Assert: referencingScriptOrModule is a Script Record or Module Record (i.e. is not null).
+  3. Let argRef be the result of evaluating AssignmentExpression.
+  4. Let specifier be ? GetValue(argRef).
+  5. Let promiseCapability be ! NewPromiseCapability(%Promise%).
+  6. Let specifierString be ToString(specifier).
+  7. IfAbruptRejectPromise(specifierString, promiseCapability).
+  8. Perform ! HostImportModuleDynamically(referencingScriptOrModule, specifierString, promiseCapability).
+  9. Return promiseCapability.[[Promise]].
+
+flags: [module]
+features: [dynamic-import]
+---*/
+
+async function f() {
+  import(/*{ params }*/).then(imported => {
+
+    /*{ body }*/
+
+  }).then($DONE, $DONE).catch($DONE);
+}
+
+f();
+