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[as] Accept comments only at the beginning of field

This avoid problems with string and avoid the problems of parsing
before spliting.

--- a/as/parser.c

+++ b/as/parser.c

@@ -58,7 +58,11 @@

 	if ((begin = *oldp) == NULL)

 		return NULL;

-	if (s = memchr(begin, '\t', *siz)) {

+

+	if (*begin == '/') {

+		*begin = '\0';

+		*oldp = NULL;

+	} if (s = memchr(begin, '\t', *siz)) {

 		*s++ = '\0';

 		*siz -= s - begin;

 		*oldp = s;

@@ -111,7 +115,7 @@

 	if (s) {

 		while (isspace(*s))

 			++s;

-		if (*s != '\0' && *s != ';')

+		if (*s != '\0' && *s != '/')

 			error("trailing characters at the end of the line");

 	}

@@ -141,10 +145,6 @@

 	}

 	buff[n-1] = '\0';

-	if (p = memchr(buff, '#', n)) {

-		*p = '\0';

-		n = p - buff;

-	}

 	if (extract(buff, n, lp) == 0)

 		goto repeat;

 	return 1;