TypeScript/tests/cases/compiler/excessPropertyCheckWithSpread.ts

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declare function f({ a: number }): void
interface I {
readonly n: number;
}
declare let i: I;
f({ a: 1, ...i });
interface R {
opt?: number
}
interface L {
opt: string
}
declare let l: L;
declare let r: R;
f({ a: 1, ...l, ...r });