SCM_SYM_UNQUOTE_SPLICING  503 src/read.c                     return read_quoted(port, SCM_SYM_UNQUOTE_SPLICING, ctx);
SCM_SYM_UNQUOTE_SPLICING  485 src/write.c                } else if (SCM_CAR(obj) == SCM_SYM_UNQUOTE_SPLICING) {