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Missing excess property error with spread #27355

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@ghost

Description

TypeScript Version: 3.1.0-dev.201xxxxx

Code

function f(o: { a: number, b: number }): { a: number } {
    return { b: 0, ...o };
}

Expected behavior:

Error on b.

Actual behavior:

No error.

Broken by #26798.

Related Issues: #27166, #23340

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