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https://github.com/vercel-labs/scriptc.git
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Chris Tate
ad834307b1
- Spread calls build one fresh argument array with JS's left-to-right evaluation, on both backends and under --dynamic, with V8's exact non-iterable TypeError texts - Fence lambdas inside rest arrows spell the hidden rest slot, curing an ICE the destructuring promotions exposed - The LLVM promise.reject lowering admits dyn reasons, mirroring the C backend and the IR contract
47 lines
1.4 KiB
JavaScript
47 lines
1.4 KiB
JavaScript
// @dynamic
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// The rest-forwarding idiom under --dynamic: the `(...args)` binding is
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// the ENGINE's own arguments array (islandRest), so the forward rides
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// jsOp callSpread — the island prelude's real `f(...pre, ...s)` with
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// guards front-running V8's exact spread-call TypeError texts — and the
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// direct calls of the islandRest lambdas complete like completeArgs'
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// island pack (fixed slots positionally, surplus into one fresh engine
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// array). Same variants as the static twin: declaration, closure, const
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// re-binding, leading fixed params, chained rest-to-rest, plus the
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// nullish/non-iterable error texts. Node is the oracle byte-for-byte.
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"use strict";
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function decl(a, b) {
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return a * 10 + b;
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}
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const clos = (a, b) => a + b;
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const fDecl = (...args) => decl(...args);
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const fClos = (...args) => clos(...args);
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const ref = clos;
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const fRef = (...args) => ref(...args);
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const fLead = (x, ...rest) => decl(x, ...rest);
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const fChain = (...args) => fClos(...args);
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console.log(`${fDecl(1, 2)}`);
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console.log(`${fClos(3, 4)}`);
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console.log(`${fRef(5, 6)}`);
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console.log(`${fLead(7, 8)}`);
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console.log(`${fChain(9, 10)}`);
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// V8's spread-call TypeError texts, catchably.
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const first = (x) => x;
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function probe(v) {
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const g = (...args) => first(...args);
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try {
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return g(...v);
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} catch (err) {
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console.log(`caught: ${err.message}`);
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return null;
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}
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}
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probe(42);
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probe(null);
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probe(undefined);
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console.log("done");
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