Listener is an interactive interface to Retro Forth.

To use:

  * Have a copy of `rre` executable in your bin/ directory
  * Run ./bin/listener

A quick start:

  make
  ./bin/listener

Requirements:

  * Unix-like host system
  * BASH or similar shell supporting Here documents
  * stty

Using:

Just type in your code. The listener evaluates tokens as they are
entered.

Use `words` to get a list of named words, and `bye` to exit.

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