message: Use single argument to vec4 constructor
diff: @@ -4,6 +4,7 @@ extern crate rand;
  use glium::glutin;
  fn main() {
  +
  let context = glutin::HeadlessRendererBuilder::new(1024, 1024).build().unwrap();
  let display = glium::HeadlessRenderer::new(context).unwrap();
  @@ -20,7 +21,7 @@ fn main() {
  void main() {
  vec4 val = values[gl_GlobalInvocationID.x];
  - values[gl_GlobalInvocationID.x] = pow(val, vec4(power,power,power,power));
  + values[gl_GlobalInvocationID.x] = pow(val, vec4(power));
  }
  "#).unwrap();
  