anchor.diff:  # Nodejs
   #############
   
  -FROM ubuntu:xenial as nodejs_tools_context
  +FROM ubuntu:bionic as nodejs_tools_context
   
   # Pinned versions of stuff we pull in
   ENV BABEL_CLI_VERSION=v7.6.2
  
positive.code: # Ruby
  #############
  
  FROM ubuntu:xenial as ruby_tools_context
  
  # Pinned versions of stuff we pull in
  ENV AWESOMEBOT_VERSION=1.19.1
  
negative.code: # Base OS
  #############
  
  FROM ubuntu:bionic as base_os_context
  
  ENV DOCKER_VERSION=5:19.03.2~3-0~ubuntu-bionic
  ENV CONTAINERD_VERSION=1.2.6-3
  
  ENV OUTDIR=/out
  