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=== tests/cases/compiler/nonNullParameterExtendingStringAssignableToString.ts ===
declare function foo(p: string): void;
>foo : (p: string) => void
>p : string
function fn<T extends string | undefined, U extends string>(one: T, two: U) {
>fn : <T extends string | undefined, U extends string>(one: T, two: U) => void
>one : T
>two : U
let three = Boolean() ? one : two;
>three : T | U
>Boolean() ? one : two : T | U
>Boolean() : boolean
>Boolean : BooleanConstructor
>one : T
>two : U
foo(one!);
>foo(one!) : void
>foo : (p: string) => void
>one! : NonNullable<T>
>one : T
foo(two!);
>foo(two!) : void
>foo : (p: string) => void
>two! : NonNullable<U>
>two : U
foo(three!); // this line is the important one
>foo(three!) : void
>foo : (p: string) => void
>three! : NonNullable<T> | NonNullable<U>
>three : T | U
}
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