### `++slug`

Use gate to parse delimited list

Parser modifier: By composing with a gate, parse a delimited `++list` of
matches.

Accepts
-------

`bus` is a `++rule`.

`fel` is a `++rule`.

Produces
--------

A `++rule`.

Source
------

    ++  slug
      |*  raq/_|*({a/* b/*} [a b])
      |*  {bus/rule fel/rule}
      ;~((comp raq) fel (stir +<+.raq raq ;~(pfix bus fel)))
    ::


Examples
--------
    
    ~zod/try=> (scan "20+5+110" ((slug add) lus dem))
    135
    ~zod/try=> `@t`(scan "a b c" ((slug |=(a/[@ @t] (cat 3 a))) ace alp))
    'abc'



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