diff --git a/byterun/include/stack.h b/byterun/include/stack.h
index e04ecdb46..246c855de 100644
--- a/byterun/include/stack.h
+++ b/byterun/include/stack.h
@@ -173,7 +173,9 @@ static inline void s_enter_f(char *rp, bool is_closure_call, auint args_sz,
     s_failure(&s, "not enough parameters in function stack");
   }
 
-  void *closure = is_closure_call ? s_nth(args_sz) : NULL;
+  void *closure = is_closure_call ? *s_nth(args_sz) : NULL;
+  // printf("is_closure_call: %i, closure: %li\n", is_closure_call,
+  // (aint)closure);
 
   // s_push_nil(s); // sp contains value, frame starts with next value
   s_pushn_nil(frame_sz());
@@ -289,15 +291,15 @@ static inline void **var_by_category(enum VarCategory category, size_t id) {
       s_failure(&s, "not boxed value expected in closure index");
     }
     data *d = TO_DATA(s.fp->closure);
-    size_t count = get_len(d) - 1;
+    int count = get_len(d) - 1;
 #ifdef DEBUG_VERSION
     printf("id is %i, count is %i\n", id, count);
 #endif
-    if (count <= id) {
+    if ((int64_t)id >= count) {
       s_failure(&s,
                 "can't read arguments: too big id"); //, %i >= %ul", id, count);
     }
-    return (void **)d->contents + id; // order is not important
+    return ((void **)d->contents) + count - id; // order is not important
   }
 
   return var;
diff --git a/byterun/regression_check.sh b/byterun/regression_check.sh
index 92dec825a..a7dd02d4c 100755
--- a/byterun/regression_check.sh
+++ b/byterun/regression_check.sh
@@ -8,11 +8,12 @@ suffix=".lama"
 for test in ../regression/*.lama; do 
   echo $test
   lamac -b  $test > /dev/null
-  ./byterun.exe -v test*.bc > /dev/null
+  test_file="${test%.*}"
+  echo $test_file
+  cat $test_file.input | ./byterun.exe -vi test*.bc > /dev/null
   rm test*.bc
   echo "done"
 done
 
-rm test.bc
 rm *.o
 
diff --git a/byterun/src/analyzer.cpp b/byterun/src/analyzer.cpp
index 2f86801e3..a437f62aa 100644
--- a/byterun/src/analyzer.cpp
+++ b/byterun/src/analyzer.cpp
@@ -128,11 +128,11 @@ void analyze(Bytefile *bf) {
     current_ip = ip;
     saved_current_ip = current_ip;
 
-    // #ifdef DEBUG_VERSION
+#ifdef DEBUG_VERSION
     const auto [cmd, l] = parse_command(&ip, bf, std::cout);
-    // #else
-    //     const auto [cmd, l] = parse_command(&ip, bf);
-    // #endif
+#else
+    const auto [cmd, l] = parse_command(&ip, bf);
+#endif
 
     if (current_begin_counter == nullptr && cmd != Cmd::BEGIN &&
         cmd != Cmd::CBEGIN) {
@@ -144,9 +144,9 @@ void analyze(Bytefile *bf) {
     }
     current_stack_depth = visited[current_ip - bf->code_ptr];
 
-    // #ifdef DEBUG_VERSION
+#ifdef DEBUG_VERSION
     std::cout << " -- [" << current_stack_depth << ']' << '\n';
-    // #endif
+#endif
 
     ++current_ip; // skip command byte
 
diff --git a/byterun/src/interpreter.c b/byterun/src/interpreter.c
index 3dc5475d6..8008fb3b2 100644
--- a/byterun/src/interpreter.c
+++ b/byterun/src/interpreter.c
@@ -14,7 +14,7 @@ void *__stop_custom_data;
 #define ASSERT_UNBOXED(memo, x)                                                \
   do                                                                           \
     if (!UNBOXED(x))                                                           \
-      failure("unboxed value expected in %s\n", memo);                         \
+      failure("%s: unboxed value expected in %s\n", __LINE__, memo);                         \
   while (0)
 
 struct State s;
@@ -94,9 +94,9 @@ void run(Bytefile *bf, int argc, char **argv) {
     s.instr_ip = s.ip;
     uint8_t x = ip_read_byte(&s.ip), h = (x & 0xF0) >> 4, l = x & 0x0F;
 
-#ifdef DEBUG_VERSION
-    printf("0x%.8x\n", s.ip - bf->code_ptr - 1);
-#endif
+// #ifdef DEBUG_VERSION
+    printf("0x%.8x: %s\n", s.ip - bf->code_ptr - 1, read_cmd(s.ip - 1, s.bf));
+// #endif
 
     switch (h) {
     case CMD_EXIT:
@@ -106,10 +106,13 @@ void run(Bytefile *bf, int argc, char **argv) {
     case CMD_BINOP: { // BINOP ops[l-1]
       void *snd = s_pop();
       void *fst = s_pop();
-      if (l == CMD_BINOP_SUB) {
+      int op = l - 1;
+      if (op == CMD_BINOP_SUB) {
         s_push_i(Ls__Infix_45(fst, snd));
+      } else if (op == CMD_BINOP_EQ) {
+        s_push_i(Ls__Infix_6161(fst, snd));
       } else {
-        switch (l - 1) {
+        switch (op) {
 #define BINOP_OPR(val, op)                                                     \
   case val:                                                                    \
     ASSERT_UNBOXED("captured op:1", fst);                                      \
@@ -357,7 +360,8 @@ void run(Bytefile *bf, int argc, char **argv) {
 #endif
         s_push(bf->code_ptr + call_offset);
 
-        void *closure = Bclosure((aint *)__gc_stack_top, args_count);
+        void *closure = Bclosure((aint *)__gc_stack_top, BOX(args_count));
+        // printf("args is %li, count is %li\n", args_count, get_len(TO_DATA(closure)));
 
         s_popn(args_count + 1);
         s_push(closure);
@@ -397,8 +401,8 @@ void run(Bytefile *bf, int argc, char **argv) {
         aint args_count = ip_read_int(&s.ip);
 
 #ifdef DEBUG_VERSION
-        printf("tag hash is %i, n is %i, peek is %i\n",
-               UNBOX(LtagHash((char *)name)), args_count, s_peek(&s));
+        printf("tag hash is %i, n is %i, peek is %i, unboxed: %li\n",
+               UNBOX(LtagHash((char *)name)), args_count, s_peek(&s), UNBOXED(s_peek(&s)));
 #endif
 
         s_push_i(Btag(s_pop(), LtagHash((char *)name), BOX(args_count)));
diff --git a/byterun/src/parser.cpp b/byterun/src/parser.cpp
index a2795a606..918747759 100644
--- a/byterun/src/parser.cpp
+++ b/byterun/src/parser.cpp
@@ -596,7 +596,7 @@ void print_file(const Bytefile &bf, std::ostream &out) {
 
   while (true) {
     out << std::setfill('0') << std::setw(8) << std::hex << ip - bf.code_ptr
-        << ": ";
+        << ": " << std::dec;
     const auto [cmd, l] = parse_command(&ip, &bf, out);
     out << '\n';