test/language/statements/using/using-allows-undefined-initializer.js

// Copyright (C) 2023 Ron Buckton. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-let-and-const-declarations-runtime-semantics-evaluation
description: Allows undefined in initializer of 'using'
info: |
  RS: Evaluation
    UsingDeclaration : using BindingList ;

    1. Perform ? BindingEvaluation of BindingList with argument sync-dispose.
    2. Return empty.

  RS: BindingEvaluation
    LexicalBinding : BindingIdentifier Initializer

    ...
    5. Return ? InitializeReferencedBinding(lhs, value, hint).

  InitializeReferencedBinding ( V, W )

  ...
  4. Return ? base.InitializeBinding(V.[[ReferencedName]], W).

  InitializeBinding ( N, V, hint )

  ...
  2. If hint is not normal, perform ? AddDisposableResource(envRec.[[DisposeCapability]], V, hint).
  ...

  AddDisposableResource ( disposeCapability, V, hint [, method ] )

  1. If method is not present then,
    a. If V is either null or undefined and hint is sync-dispose, then
      i. Return unused.
    ...
  ...

features: [explicit-resource-management]
---*/

{
  using x = undefined;
}