mirror of
https://github.com/vercel-labs/scriptc.git
synced 2026-10-24 06:14:01 +08:00
Chris Tate
b9662a34a1
- Establishment/containment: miss-first ternary polarity, else-if head exits, bare-block vs alias guards, break/continue exit guards, post-loop re-tests, while-condition guards, born-narrowed declarations (2390-2396) - Kill routing: branch/switch-arm/reassignment-polarity kills at merges, and kills riding return/break/labeled-break/continue/throw edges (2397-2406) - Terminality: infinite-loop sealing and re-opening, loop-body returns, stacked and trailing-empty case labels, defaultless exhaustive switches (2407-2411) - do-while trailing tests under body guards, kills, continue, and break, plus spread-arm ternary lowering shapes, ?? null identity, float-lane bounds, IEEE remainder corners, and parameter null reassignment (2412-2423) - Order-parity baselines re-recorded for the new entries (pure addition)
22 lines
635 B
TypeScript
22 lines
635 B
TypeScript
// A switch arm reassigning a narrowed local to null kills the narrow past the switch; other arms keep using the narrow in-body.
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type Msg = { readonly kind: "set"; readonly value: number } | { readonly kind: "clear" };
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function f(q: number | null, msg: Msg): number {
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let p: number | null = q;
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if (p === null) return -1;
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switch (msg.kind) {
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case "set": {
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p = p + msg.value;
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break;
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}
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case "clear": {
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p = null;
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break;
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}
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}
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if (p === null) return 0;
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return p;
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}
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console.log(f(5, { kind: "set", value: 3 }));
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console.log(f(5, { kind: "clear" }));
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console.log(f(null, { kind: "clear" }));
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