.ERRNZ           Error If True                                 MASM Directive

.ERRNZ expression

Forces a fatal error if expression is true (nonzero).

Notes:     Expression must resolve to an absolute value and not
contain a forward reference.

The error message that may be generated by this
directive is 'Forced error - expression not equal 0',
which is error number 91.

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

See also: .ERRE

.ERRNZ Error If True