test/language/statements/using/throws-if-initializer-not-object.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: Throws if initialized value is not an Object
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.
    b. Let resource be ? CreateDisposableResource(V, hint).
  ...

  CreateDisposableResource ( V, hint [ , method ] )

  1. If method is not present, then
    a. If V is either null or undefined, then
      ...
    b. Else,
      i. If V is not an Object, throw a TypeError exception.
      ...
  ...

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

assert.throws(TypeError, function() {
  using x = true;
}, 'true');

assert.throws(TypeError, function() {
  using x = false;
}, 'false');

assert.throws(TypeError, function() {
  using x = 1;
}, 'number');

assert.throws(TypeError, function() {
  using x = 'object';
}, 'string');

var s = Symbol();
assert.throws(TypeError, function() {
  using x = s;
}, 'symbol');