Comment change: exclude unreachable case in prolog1
@@ -170,7 +170,14 @@ prolog1(PROLOG_STATE *state,
case XML_TOK_COMMENT:
return XML_ROLE_COMMENT;
case XML_TOK_BOM:
- return XML_ROLE_NONE;
+ /* This case can never arise. To reach this role function, the
+ * parse must have passed through prolog0 and therefore have had
+ * some form of input, even if only a space. At that point, a
+ * byte order mark is no longer a valid character (though
+ * technically it should be interpreted as a non-breaking space),
+ * so will be rejected by the tokenizing stages.
+ */
+ return XML_ROLE_NONE; /* LCOV_EXCL_LINE */
case XML_TOK_DECL_OPEN:
if (!XmlNameMatchesAscii(enc,
ptr + 2 * MIN_BYTES_PER_CHAR(enc),
