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.ERRNDEF         Error If Name Is Not Defined                  MASM Directive

  .ERRNDEF  name

    Forces a fatal error if name is not defined.

       Notes:     If the name is defined as a forward reference, it is
                  considered undefined on the first pass, but defined on
                  the second.

                  The error message that may be generated by this
                  directive is 'Forced error - symbol not defined', which
                  is error number 92.

                  If an error is generated, the object module is deleted
                  and the assembler exits with an exit code of 7.