Using String() like we did before depends on objects having either
toString, valueOf, or @@toPrimitive, which is not the case for objects
with no prototype.
More specifically: cleanupSome, register & unregister.
FinalizationRegistery.prototype.cleanupSome is actually still a stage 2
proposal, but since test262 test cases already exist for it, i decided
to go for it :)
This commit implements parsing for `yield *expr`, and the multiple
ways something can or can't be parsed like that.
Also makes yield-from a TODO in the bytecode generator.
Behold, the glory of javascript syntax:
```js
// 'yield' = expression in generators.
function* foo() {
yield
*bar; // <- Syntax error here, expression can't start with *
}
// 'yield' = identifier anywhere else.
function foo() {
yield
*bar; // Perfectly fine, this is just `yield * bar`
}
```
While this implementation should be complete it is based on HashMap's
iterator, which currently follows bucket-order instead of the required
insertion order. This can be simply fixed by replacing the underlying
HashMap member in Map with an enhanced one that maintains a linked
list in insertion order.
Some of this stuff is already tested properly in the name and message
prototype tests, so let's focus on covering all error types here as well
instead.
More specifically, Array.prototype.splice. Additionally adds a missing
exception check to the array creation and a link to the spec.
Fixes create-non-array-invalid-len.js in the splice tests in test262.
This test timed out instead of throwing an "Invalid array length"
exception.
"let" and "const" go in the lexical environment.
This fixes one part of #4001 (Lexically declared variables are mixed up
with global object properties)
While this implementation should be complete it is based on HashTable's
iterator, which currently follows bucket-order instead of the required
insertion order. This can be simply fixed by replacing the underlying
HashTable member in Set with an enhanced one that maintains a linked
list in insertion order.
This was missing from Value::is_array(), which is equivalent to the
spec's IsArray() abstract operation - it treats a Proxy value with an
Array target object as being an Array.
It can throw, so needs both the global object and an exception check
now.
