urbit/base/pub/doc/hoon/runes/bc/bcpm.md

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2015-02-18 06:03:21 +03:00
[bucpam `$&` %bcpm](#bcpm)
==========================
Pair / tag
`$&` is a tile rune that produces a `%bush`. A `%bush` is a tile whose
[icon]() is a [fork]() between two different kinds of nouns: cells whose
head is a cell and cells whose head is an atom `(tile q)`. Its default
value is the value of `q`. One important use of `$&` is to implement
autocons in [`++twig`]() and [`++tile`]().
Produces
--------
[Tile](): `[%bush p=tile q=tile]`
Sample
------
`p` is a [tile]().
Tall form
---------
$& p
q
Wide form
---------
$&(p q)
Irregular form
--------------
None
Examples
--------