unused_funarg_1: {
    options = { unused: true };
    input: {
        function f(a, b, c, d, e) {
            return a + b;
        }
    }
    expect: {
        function f(a, b) {
            return a + b;
        }
    }
}

unused_funarg_2: {
    options = { unused: true };
    input: {
        function f(a, b, c, d, e) {
            return a + c;
        }
    }
    expect: {
        function f(a, b, c) {
            return a + c;
        }
    }
}

unused_nested_function: {
    options = { unused: true };
    input: {
        function f(x, y) {
            function g() {
                something();
            }
            return x + y;
        }
    };
    expect: {
        function f(x, y) {
            return x + y;
        }
    }
}

unused_circular_references_1: {
    options = { unused: true };
    input: {
        function f(x, y) {
            // circular reference
            function g() {
                return h();
            }
            function h() {
                return g();
            }
            return x + y;
        }
    };
    expect: {
        function f(x, y) {
            return x + y;
        }
    }
}

unused_circular_references_2: {
    options = { unused: true };
    input: {
        function f(x, y) {
            var foo = 1, bar = baz, baz = foo + bar, qwe = moo();
            return x + y;
        }
    };
    expect: {
        function f(x, y) {
            moo();              // keeps side effect
            return x + y;
        }
    }
}

unused_circular_references_3: {
    options = { unused: true };
    input: {
        function f(x, y) {
            var g = function() { return h() };
            var h = function() { return g() };
            return x + y;
        }
    };
    expect: {
        function f(x, y) {
            return x + y;
        }
    }
}