anchor.diff:  # Base OS
   #############
   
  -FROM ubuntu:bionic as base_os_context
  -
  -ENV DOCKER_VERSION=5:19.03.2~3-0~ubuntu-bionic
  +FROM ubuntu:xenial as base_os_context
  +
  +ENV DOCKER_VERSION=5:19.03.2~3-0~ubuntu-xenial
   ENV CONTAINERD_VERSION=1.2.6-3
   
   ENV OUTDIR=/out
  
positive.code: # Python
  #############
  
  FROM ubuntu:bionic as python_context
  
  # Pinned versions of stuff we pull in
  ENV AUTOPEP8_VERSION=1.4.4
  
negative.code: # Nodejs
  #############
  
  FROM ubuntu:xenial as nodejs_tools_context
  
  # Pinned versions of stuff we pull in
  ENV BABEL_CLI_VERSION=v7.6.2
  