|  |  5.1.30 ERROR 
Syntax:ERROR (string_expression)Type:none
Purpose:Immediately interrupts the current computation, returns to the
top-level, and displays the argument string_expressionas error
message.
Note:This should be used as an emergency, resp. failure, exit within procedures.
Example:|  | int i=1;
proc myError() {ERROR("Need to leave now");i=2;}
myError();
==>    ? Need to leave now
==>    ? leaving ::myError (0)
i;
==> 1
 | 
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