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proper format and class is a lower-case word.

(skip_chars): New arg HANDLE_ISO_CLASSES.  Callers changed.
If requested, make a list of classes, then check the scanned
chars for membership in them.
(in_classes): New function.
(Fskip_chars_forward): Doc fix.

(find_defun_start): Likewise.
(scan_lists): Likewise.
(INC_FROM): Likewise.
(scan_sexps_forward): Likewise.

Fix off-by-one boundary check for string and comment fences.

character.

return beginning of buffer.

technique of *p, *stop, and *endp.

(open-paren-in-column-0-is-defun-start): Doc fix.

Declare all args (per C99).

Use a more obvious fix: check eob before updating the syntax table.

a char rather than after so we don't update the table past eob.

(scan_lists, scan_sexps_forward): Pacify the compiler.

contents as const.

SCHARS, SBYTES, STRING_INTERVALS, SREF, SDATA; explicit size_byte references
left unchanged for now.

(describe_syntax, describe_syntax_1, Fdescribe_syntax): Remove.

(describe_syntax_1): Update call to describe_vector.

(Finternal_describe_syntax_value): Rename from describe_syntax.
Don't insert space at front and \n at the end.
(syms_of_syntax): Defsubr Sinternal_describe_syntax_value.

(Fforward_comment): Don't skip quoted chars when going backward.

properties as old_prop before deciding not to invalidate.