5.15 Slightly Looser Rules for Escaped Newlines
Recently, the preprocessor has relaxed its treatment of escaped
newlines. Previously, the newline had to immediately follow a
backslash. The current implementation allows whitespace in the form
of spaces, horizontal and vertical tabs, and form feeds between the
backslash and the subsequent newline. The preprocessor issues a
warning, but treats it as a valid escaped newline and combines the two
lines to form a single logical line. This works within comments and
tokens, as well as between tokens. Comments are not treated as
whitespace for the purposes of this relaxation, since they have not
yet been replaced with spaces.
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