anchor.diff:      clisp \
       cmake \
       crystal \
  +    cython \
  +    cython3 \
       dmd-compiler dub \
       erlang \
       gauche \
  
positive.code:     "cobc --version | head -n 1" \
      "coffee -v | head -n 1" \
      "crystal -v | head -n 1" \
      "mcs --version | head -n 1" \
      "dmd --version | head -n 1" \
      "erl +V 2>&1 | head -n 1" \
  
negative.code:     "ocaml -version | head -n 1" \
      "pip -V | head -n 1" \
      "pip3 -V | head -n 1" \
      "python -V | head -n 1" \
      "python3 -V | head -n 1" \
      "perl -v | sed -n 2P" \
      "php -v | head -n 1" \
  