16 lines
331 B
TypeScript
16 lines
331 B
TypeScript
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// @strict: true
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// Repro from #38198
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type Recur<T> = (
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T extends (unknown[]) ? {} : { [K in keyof T]?: Recur<T[K]> }
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) | ['marker', ...Recur<T>[]];
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function join<T>(l: Recur<T>[]): Recur<T> {
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return ['marker', ...l];
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}
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function a<T>(l: Recur<T>[]): void {
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const x: Recur<T> | undefined = join(l);
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}
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