Proof of concept `async` / `await` implementation.#2340

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aardvark179 wants to merge 56 commits intomozilla:masterfrom

aardvark179:aardvark179-async-poc

Commits on Apr 3, 2026

Move `call` and `construct` to `VarScope`.
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Move `JSCode` signatures to use `VarScope` for scopes.
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First round of conversion of `Scriptable` to `VarScope`.
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Second round of conversion of `Scriptable` to `VarScope`.
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Third round of conversion of `Scriptable` to `VarScope`.
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Fourth round of conversions of `Scriptable` to `VarScope`.
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Make parameter type of `setParentScope` be `VarScope`.
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Change `ScriptRuntime` in preparation for full separation.
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Final round of conversion of `Scriptable` to `VarScope`.
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Make `Scriptable` and `VarScope` separate descendants of `PropHolder`.
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Remove old `NativeWith` implementation.
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Convert `BaseFunction` to descriptor.
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Convert `NativeString` to descriptors.
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Convert `NativeNumber` to descriptors.
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Move `NativeMath` to descriptors.
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Convert `NativeJSON` to descriptors.
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Convert `NativeScript` to descriptors.
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Move `NativeIterator` to be based on descriptors.
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Convert `NativeGlobal` to descriptor.
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Convert error initialisation to descriptors.
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Global fixup.
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Convert `ArrayBuffer` to descriptors.
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Move typed array to descriptor.
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Update test 262 properties.
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Move `NativeDataView` to descriptors.
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Removing unused methods
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Convert `NativeMap` to descriptor.
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Move `NativeSet` to descriptors.
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Move `NativePromise` to descriptors.
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Move `NativeWeakMap` to descriptor.
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Move `NativeWeakSet` to descriptors.
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Convert `NativeBigInt` to descriptor.
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Convert `NativeProxy` to descriptor.
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Convert `NativeReflect` to descriptors.
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Convert `NativeContinuation` to descriptor.
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Convert `NativeGenerator` to descriptor.
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Spotless.
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Convert `NativeCallSite` to descriptors.
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Convert `ES6Iteratorz` to descriptors.
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Update 262 properties.
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Convert `thisObj` to be `Object` not `Scriptable`.
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Update test 262 properties.
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Implement runtime semantics of new target.
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Expose `new.target` in the language.
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Enable `new.target` in 262 tests.
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Expose $262 in shell for ease of exploratory testing.
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Refactor away from `WithScope` for catching exceptions.
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Update 262 properties.
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Fix various destructuring issues.
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Update 262 properties.
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Add support for `async` to 262 test runner.
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Initial async parsing support.
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Initial 262 properties update.
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Enable `async-function`s in 262 tests and update properties.
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Await proof of concept implementation.
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Update 262 properties.
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