code: func (p *player) RotateLeft() {
  	p.angle--
  	if p.angle < 0 {
  		p.angle += maxAngle
  	}
  	p.lean--
  	if p.lean < -maxLean {
  		p.lean = -maxLean
  	}
  }
docs: // RotateLeft rotates the player p in the left direction.