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   ◄Directive Summary►  ◄Summary►
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  Syntax:   .ERRE expression
            .ERRNZ expression
 
  Tests value of expression and generates a severe error depending on
  the resulting value. .ERRE generates an error if expression evaluates
  to false (zero). .ERRNZ generates an error if expression evaluates to
  true (nonzero).
 
  expression   An expression that evaluates to true or false, or as a
               numeric constant. The expression cannot contain forward
               references.
 
  See Also:  .ERR, .ERR1, .ERRB, .ERRDEF, .ERRDIF
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