A // or /* */ comment that is annotated with + in the
leftmost column is considered to be added code. A // or
/* */ comment without such an annotation is considered to be a
comment about the SmPL code, and thus is not matched in the C code.
The following preprocessor directives can likewise be added. They cannot be matched against. The entire line is added, but it is not parsed.
if
ifdef
ifndef
else
elif
endif
error
line