If this variable is non-nil, scan-sexps treats all
non-ASCII characters as symbol constituents regardless of
what the syntax table says about them. (However, syntax-table
text properties can still override the syntax.)
If the value is non-nil, then comments are treated as
whitespace by the functions in this section and by forward-sexp,
scan-lists and scan-sexps.
The behavior of parse-partial-sexp is also affected by
parse-sexp-lookup-properties (see Syntax Properties).
If this buffer local variable is non-nil, a single character
which usually terminates a comment doesn’t do so when that character
is escaped. This is used in C and C++ Modes, where line comments
starting with ‘//’ can be continued onto the next line by
escaping the newline with ‘\’.
You can use forward-comment to move forward or backward over
one comment or several comments.