sucl/dnc.dcl


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definition module dnc

// $Id$

from graph import Graph,Node
from StdString import String
from StdOverloaded import ==

// dnc is like varcontents, but can give a more reasonable error message
// when the contents is used when undefined.
dnc :: (var->.String) !(Graph .sym var) var -> (.Bool,Node .sym var) | == var