6.1 Invisible comments

@z...@x

If a source or include file begins with ‘@z’ (in the very first two characters of the file), then all material is skipped until and including a line beginning in column 1 with ‘@x’ [except that lines of the form ‘$Keyword: text of keyword $’ are processed; see $KEYWORD, ATK_ (source files), or ATk (include files)].

@%

All material until and including the next newline is completely ignored.

@%%

As ‘@%’, but also skip blank lines that immediately follow the current line.

For example,

@z
Author:  J. A. Krommes
@x
@c @% This sets the global language to C.
@* EXAMPLE.