File: nonNullParameterExtendingStringAssignableToString.ts

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// @strict: true
declare function foo(p: string): void;

function fn<T extends string | undefined, U extends string>(one: T, two: U) {
    let three = Boolean() ? one : two;
    foo(one!);
    foo(two!);
    foo(three!); // this line is the important one
}