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