anchor.diff: -ARG IMAGE="ubuntu:18.04"
  +ARG IMAGE="python:3-slim-buster"
   
   #---
   
  
positive.code: 
  RUN apt-get update -qq \
   && DEBIAN_FRONTEND=noninteractive apt-get -y install --no-install-recommends \
      clang \
      bison \
      build-essential \
      flex \
      gawk \
      git \
      libffi-dev \
      pkg-config \
      python3 \
   && apt-get autoclean && apt-get clean && apt-get -y autoremove \
   && rm -rf /var/lib/apt/lists
  
  
negative.code: RUN apt-get update -qq \
   && DEBIAN_FRONTEND=noninteractive apt-get -y install --no-install-recommends \
      ca-certificates \
      clang \
      curl \
      libffi-dev \
      libreadline-dev \
      tcl-dev \
      graphviz \
      xdot \
   && apt-get autoclean && apt-get clean && apt-get -y autoremove \
   && update-ca-certificates \
   && rm -rf /var/lib/apt/lists
  