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     Math error M6111
 
     stack underflow
 
     A floating-point operation resulted in a stack underflow on the
     8087/287/387 coprocessor or the emulator.
 
     This error is often caused by a call to a long double function
     that does not return a value. For example, the following generates
     this error when compiled and run:
 
          long double ld() {};
 
          main ()
          {
            ld();
          }
 
     This error terminates the program with exit code 139.
                                    -♦-