4.9.56 Warn Directive
The WARN
directive produces a user-defined build-time warning message.
Execution of this directive will not prevent the assembler
from building. The warning to be printed should this directive be executed is specified
as a string. Typically this directive will be made conditional, to detect an invalid
situation.
For example:
IF MODE
movwf modeQ
ELSE
WARN "MODE is zero - write skipped"
ENDIF