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 **=                 Exponentiation compound assignment operator (binary)
------------------------------------------------------------------------------
 Syntax
   nVar **= nNumber

 Arguments
   nVar is a numeric variable that receives the assignment. The variable
   must be initialized to a value before performing the operation.

   nNumber is the right operand to the ** operator.

 Description
   The **= operator performs a ** operation with the current value
   of nVar and nNumber, then assigns the result to nVar.

   The action by **= is equivalent to nVar := ( nVar ** nNumber ).

 Example
   #define EXAMPLE_OPERATOR
   #include example.hdr

   proc Test_941
   vardef
      uint nValue
   enddef
   nValue := 10
   nValue **= 3
   ? nValue                               // prints 1000
   endproc

   proc main
   Test_941()
   endproc