// Copyright JS Foundation and other contributors, http://js.foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

function check_syntax_error (code)
{
  try {
    eval (code)
    assert (false)
  } catch (e) {
    assert (e instanceof SyntaxError)
  }
}

function f(...a)
{
  return a.length
}

check_syntax_error ("f(,)")
check_syntax_error ("f(,1)")
check_syntax_error ("f(1,,)")
check_syntax_error ("f(1,,2)")

assert(f(10) === 1)
assert(f(10,) === 1)
assert(f(10,11) === 2)
assert(f(10,11,) === 2)