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Requires an actual type operation.(2322 extra error) #1090

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sunrabbit123 opened this issue Sep 17, 2023 · 0 comments

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sunrabbit123 commented Sep 17, 2023

// @strict: true
// @declaration: true

function f2<T extends string | undefined>(x: T, y: NonNullable<T>) {
    x = y;
    y = x;  // Error
    let s1: string = x;  // Not error, because `actual_type` of `x` is `string` from `x = y`
    let s2: string = y;
}

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