FIX BUG!
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features:
   $ .. ; for procedure definition
   *... ! for procedure call
  see `example/funcall.bf`
ADD NEW FEATURE `INT LITERAL`
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REASON
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to many `+++++` or `-----` repeats.
add `%digit` for repeating.

USAGE
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  `%xyz` to repeat xyz times
 see `example/int-literal.bf` for usage.
NEW FEATURE: `DATA STACK`
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REASON
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way to jump back to special position

USAGE
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    &   for push data stack // reference
    @   for pop stack       // dereference