scriptc

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Chris Tate 51777dee63 Add markAsUncloneable and worker[Symbol.asyncDispose]

markAsUncloneable(value) marks a plain object, a record, an error or a
class instance (scr_json.c); structuredClone and postMessage then throw
DataCloneError "Cannot clone object of unsupported type." for it, also
where it is nested. As in Node, the mark has no effect on primitives,
arrays, typed arrays and ArrayBuffers. Marked values are retained until
the thread exits; with nothing marked, the clone paths add one branch.

worker[Symbol.asyncDispose]() terminates the worker and resolves with
undefined after its 'exit' event, so `await using` disposes a Worker at
the end of its block. The Worker handle's symbol_get op answers the
well-known symbol: the symbol unit registers Symbol.asyncDispose with the
dyn core when the program names it, and scr_dyn_is_async_dispose_symbol
tells the worker unit, so worker programs that never name the symbol do
not link the symbol unit.

static-support.json adds rows for markAsUncloneable, isInternalThread
(already lowered as false and declared) and worker[Symbol.asyncDispose]().

Corpus 5990-5991 match Node v24.22.0; corpus-costs.json records their
costs.

2026-10-18 03:43:06 -05:00