PROGRAM FILE 150: ERROR - USING A STRING AS AN ARGUMENT                         
        FOR AN IMPLEMENTATION-SUPPLIED FUNCTION.                                
    ANSI STANDARD 7.2, 7.4, 8.2, 8.4                                            
                                                                                
SECTION 150.1: ERROR - USING A STRING AS AN ARGUMENT                            
        FOR AN IMPLEMENTATION-SUPPLIED FUNCTION.                                
                                                                                
THIS SECTION TESTS WHAT HAPPENS WHEN THE ATN FUNCTION IS                        
INVOKED WITH A CHARACTER STRING ARGUMENT, INSTEAD OF A                          
NUMERIC EXPRESSION.                                                             
                                                                                
THIS IS A TEST FOR A NON-STANDARD FEATURE OF MINIMAL BASIC.                     
TO PASS THIS TEST, THE PROCESSOR MUST EITHER:                                   
                                                                                
   1) ACCEPT THE PROGRAM AND BE ACCOMPANIED BY DOCUMENTATION                    
      ACCURATELY DESCRIBING THE FEATURE'S INTERPRETATION                        
      BY THE PROCESSOR, OR                                                      
                                                                                
   2) REJECT THE PROGRAM WITH AN APPROPRIATE ERROR MESSAGE                      
                                                                                
SEE THE NBS MINIMAL BASIC TEST PROGRAMS USER'S MANUAL                           
FOR DETAILED CRITERIA.                                                          
                                                                                
             BEGIN TEST                                                         
                                                                                
SETTING X = 5                                                                   
SETTING X$ = 'ABC'                                                              
                                                                                
ABOUT TO ATTEMPT INVOCATION OF ATN(X$).                                         
                                                                                
ERROR in line 340: Illegal function call                                        
