Needed to set `ci->proc` in `OP_SUPER`; fix
MODIFY
src/vm.c
src/vm.c
@@ -1662,6 +1662,9 @@ RETRY_TRY_BLOCK:
if (MRB_METHOD_CFUNC_P(m)) {
mrb_value v;
ci->nregs = (argc < 0) ? 3 : n+2;
+ if (MRB_METHOD_PROC_P(m)) {
+ ci->proc = MRB_METHOD_PROC(m);
+ }
v = MRB_METHOD_CFUNC(m)(mrb, recv);
mrb_gc_arena_restore(mrb, ai);
if (mrb->exc) goto L_RAISE;

Needed to set `ci->proc` in `OP_SUPER`; fix #3966