Change ref-count function
@@ -472,7 +472,7 @@ inline static int op_send( mrb_vm *vm, uint32_t code, mrb_value *regs )
int bidx = ra + rc + 1;
if( GET_OPCODE(code) == OP_SEND ){
// OP_SEND: set nil
- mrbc_dec_ref_counter( &regs[bidx] );
+ mrbc_release( &regs[bidx] );
regs[bidx].tt = MRB_TT_NIL;
} else {
// OP_SENDB: set Proc objec
