if (!parse_variables_const (lexer, dict, &src_vars, &n_srcs,
PV_NO_DUPLICATE))
goto error;
if (!lex_force_match_id (lexer, "INTO"))
goto error;
if (!parse_variables_const (lexer, dict, &src_vars, &n_srcs,
PV_NO_DUPLICATE))
goto error;
if (!lex_force_match_id (lexer, "INTO"))
goto error;