unusedTypeParameterInInterface2.ts(1,18): error TS6196: 'U' is declared but never used.


==== unusedTypeParameterInInterface2.ts (1 errors) ====
    interface int<T, U, V> {
                     ~
!!! error TS6196: 'U' is declared but never used.
        f1(a: T): string;
        c: V;
    }