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never rest type not assignable to complex rest type #33495

@jack-williams

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@jack-williams

TypeScript Version: 3.5.1

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Code

function foo<T extends any[]>() {
    const fn1: (x: string, ...rest: T) => unknown = (x, ..._) => x;
    const fn2: (...args: never) => unknown = fn1 // error
}

Expected behavior:

Assignment of fn1 to fn2 should pass.

Actual behavior:

Assignment of fn1 to fn2 should fails.

Playground Link: link

Related Issues:
#33457

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