Jonathan pointed me at a diagnostic from an unnamed static analyzer
which found that next.original_type isn't initialized for the CPP_EMBED
case when it is parsed in a comma expression, yet
  expr.original_type = next.original_type;
is done a few lines later and the expr is returned.

2024-10-16  Jakub Jelinek  <jakub@redhat.com>

	* c-parser.cc (c_parser_expression): Initialize next.original_type
	to integer_type_node for the CPP_EMBED case.