This repository begun with an exact replica of the final code for
Writing An Interpreter In Go (https://interpreterbook.com/).
It is gradually being modified to suit the needs of a filter language
for my project trpc. trpc is a frontend to the
transmission bittorrent client and will support
arbitrary filter expressions such as trpc list -f 'size < 10 MiB' to list all
torrents smaller than 10 MiB.