Renaming the discrimnant of a union should always rename all occurrences #21288

type Result =
    { kind: "success", code: number } | // 1
    { kind: "failure", message: string }; // 2
function fn(): Result {
    if (Math.random() > 0.5) {
        return { kind: "failure", message: "oops" } // 3
    } else {
        return { kind: "success", code: 200 } // 4
    }
}

const r = fn();
if (r.kind === "failure") { // 5
    r.message;
} else if (r.kind === "success") { // 6
    r.code;
}