+
+LY_DEFINE (ly_event_set_property_x, "ly:event-set-property!",
+ 3, 0, 0, (SCM ev, SCM sym, SCM val),
+ "Set property @var{sym} in event @var{ev} to @var{val}.")
+{
+ LY_ASSERT_SMOB (Stream_event, ev, 1);
+ LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
+
+ return ly_prob_set_property_x (ev, sym, val);
+}
+
+LY_DEFINE (ly_event_deep_copy, "ly:event-deep-copy",
+ 1, 0, 0, (SCM m),
+ "Copy @var{m} and all sub expressions of@tie{}@var{m}.")
+{
+ SCM copy = m;
+ if (Stream_event *ev = unsmob_stream_event (m))
+ {
+ ev = ev->clone ();
+ copy = ev->unprotect ();
+ }
+ else if (scm_is_pair (m))
+ copy = scm_cons (ly_event_deep_copy (scm_car (m)),
+ ly_event_deep_copy (scm_cdr (m)));
+
+ return copy;
+}