Function custom_adder

test/features/nested-function.js:9–11

(a,b)

  const gpu = new GPU({ mode });
  const f = gpu.createKernel(function(a, b) {
    function custom_adder(a,b) {
      return a+b;
    }

    return custom_adder(a[this.thread.x], b[this.thread.x]);
  }, {