babel/packages/babel-plugin-transform-es2015-parameters/test/fixtures/parameters/regression-5787/actual.js

function f(a, ...rest) {
  let b = rest[rest.length - 3];
  let c = rest[rest.length - 2];
  let d = rest[rest.length - 1];
  return [a, b, c, d];
}

function f(a, ...rest) {
  return rest[-1];
}