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reject-top-level-await
======================
Rejects ``await`` at the top-level of code in modules. Top-level ``await`` is
not currently support in Gecko's component modules, so this is rejected.
Examples of incorrect code for this rule:
-----------------------------------------
.. code-block:: js
await foo;
if (expr) {
await foo;
}
for await (let x of [1, 2, 3]) { }
Examples of correct code for this rule:
---------------------------------------
.. code-block:: js
async function() { await foo; }
async function() { for await (let x of [1, 2, 3]) { } }