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This Pull Request fixes [x-after-break-to-label](dc1dc28aa4/test/language/block-scope/leave/x-after-break-to-label.js)
### Example
```js
{
let x = 2;
L: {
let x = 3;
console.log(x === 3);
break L;
console.log(false);
}
console.log(x === 2);
}
```
### Previously
> Uncaught "SyntaxError": "Cannot use the undeclared label 'L'"
### Now
> true <br> true
### What did I do
1. add `lable` to `Node::Block`
2. push labelled-block's `control info` to `jump_info` list
3. pop it before `Opcode::PopEnvironment`
Co-authored-by: creampnx_x <2270436024@qq.com>
This Pull Request changes the following:
- Implement [Async-from-Sync Iterator Objects](https://tc39.es/ecma262/#sec-async-from-sync-iterator-objects)
- Give the proper `async` hint to `GetIterator` when executing a delegate yield expression in an async generator function
Currently we only spread spread-expressions if they are the last argument in the function call. With this fix all arguments are spread if needed. The downside is that an array object is allocated to store all arguments if the arguments contain a spread-expression. But with dense indexed properties inplemented in #2167 this should be reasonably fast.
This Pull Request changes the following:
- Implement parsing/cover-conversion for field accessor member expressions in [DestructuringAssignmentTarget](https://tc39.es/ecma262/#prod-DestructuringAssignmentTarget).
- Modify the `CopyDataProperties` opcode to account for excluded keys that are only known at runtime.
This Pull Request fixes#1560.
It changes the following:
- Implement `AsyncGeneratorFunction` builtin object.
- Implement `AsyncGenerator` builtin object.
- Implement async generator execution.
- Add some parse errors for async generators.
The `AsyncGenerator.prototype.return()` method currently does not work correctly with `finally` blocks, but I think we should merge this first to not increase the complexity of the pr too much.
creampnx_x
raskad