TypeScript/tests/cases/compiler/unusedTypeParametersWithUnderscore.ts

//@noUnusedParameters:true

function f<_T, U>() { }

type T<_T, U> = { };

interface I<_T, U> { };

class C<_T, U> {
    public m<_V, W>() { }
};

let l = <_T, U>() => { };