anchor.diff:      "php -v | head -n 1" \
       "ruby -v | head -n 1" \
       "rustc --version | head -n 1" \
  -    "SBT_OPTS='-Xms512M -Xmx4G' sbt | head -n 1" \
  -    "SBT_OPTS='-Xms512M -Xmx4G' sbt about | head -n 1" \
  +    "SBT_OPTS='-XX:+CMSClassUnloadingEnabled -Xms512M -Xmx2G -Xss2M -XX:MaxMetaspaceSize=1024M' sbt | head -n 1" \
  +    "SBT_OPTS='-XX:+CMSClassUnloadingEnabled -Xms512M -Xmx2G -Xss2M -XX:MaxMetaspaceSize=1024M' sbt about | head -n 1" \
       "sbt about | head -n 5 | tail -n 1" \
       "scala -version 2>&1 | head -n 1" \
       "swipl --version | head -n 1" \
  
positive.code:   && apt-get install -y \
      clang \
      clisp \
      dmd-bin \
      erlang \
      gauche \
      gdc \
  
negative.code:     rustc \
    && apt-get clean -y \
    && npm install -g \
      coffeescript \
      typescript \
      livescript \
    && adduser --disabled-password --gecos "" aicomp \
  