as: i386-Chars
9.15.3.2 Special Characters
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The presence of a '#' appearing anywhere on a line indicates the start
of a comment that extends to the end of that line.
If a '#' appears as the first character of a line then the whole line
is treated as a comment, but in this case the line can also be a logical
line number directive (Comments) or a preprocessor control
command (Preprocessing).
If the '--divide' command-line option has not been specified then the
'/' character appearing anywhere on a line also introduces a line
comment.
The ';' character can be used to separate statements on the same
line.