
-Result tent_is +Expression

   Eagerly evaulate Expression using tentative assignments.

Arguments
   Result              Variable
   Expression          Arithematic Expression

Type
   library(repair)

Description

This is similar to the normal arithmetic is/2 predicate, but 
evaluates the expression based on the tentative
assignment of its variables. The result is delivered as (an update to)
the tentative value of the Result variable.
Once initiated, tent_is will stay active and keep updating Result's
tentative value eagerly whenever the tentative assignment of any
variable in Expression changes.



Modules
   This predicate is sensitive to its module context (tool predicate, see @/2).

See Also
   is / 2, tent_set / 2, tent_call / 3
