diff --git a/src/common.cpp b/src/common.cpp
index a7b1826..f9588e3 100644
--- a/src/common.cpp
+++ b/src/common.cpp
@@ -620,6 +620,19 @@ Result<StackFrame> StackFrame::ret(uint64_t regnum) const {
   return std::move(parent_stack);
 }
 
+Result<StackFrame> StackFrame::ret(const Value& res) const {
+  auto parent_frame = TRY(parent());
+  if (parent_frame.is<Nil>()) {
+    return ERROR(EndOfProgram);
+  }
+
+  StackFrame& parent_stack = *parent_frame.to<StackFrame>();
+  uint64_t parent_size = TRY(parent_stack.size());
+  parent_stack = TRY(parent_stack.set(parent_size, res));
+
+  return std::move(parent_stack);
+}
+
 Result<StackFrame> StackFrame::detach(uint64_t depth) const {
   if (depth == 0) {
     uint64_t size = _value->size;
diff --git a/src/common.hpp b/src/common.hpp
index fca7a8d..3b714ae 100644
--- a/src/common.hpp
+++ b/src/common.hpp
@@ -1164,6 +1164,7 @@ class StackFrame : public Object {
 
   Result<StackFrame> call(const Value& fun, uint64_t start, uint64_t end) const;
   Result<StackFrame> ret(uint64_t regno) const;
+  Result<StackFrame> ret(const Value& val) const;
 
   Result<StackFrame> detach(uint64_t depth) const;
   Result<StackFrame> attach(const StackFrame& frame) const;
diff --git a/src/stdlib.cpp b/src/stdlib.cpp
index 6f83575..8f6b6d9 100644
--- a/src/stdlib.cpp
+++ b/src/stdlib.cpp
@@ -175,11 +175,7 @@ Result<StackFrame> stdlib_dict(const StackFrame& stack) {
   if (!params.is<Array>()) return ERROR(TypeMismatch);
   Value d = TRY(Dict::create(*params.to<Array>()));
 
-  auto res = TRY(stack.set(0, d));
-
-  res = TRY(res.ret(0));
-
-  return res;
+  return stack.ret(d);
 }
 
 Result<StackFrame> stdlib_list(const StackFrame& stack) {
@@ -187,21 +183,13 @@ Result<StackFrame> stdlib_list(const StackFrame& stack) {
   if (!params.is<Array>()) return ERROR(TypeMismatch);
   Value d = TRY(Pair::create(*params.to<Array>()));
 
-  auto res = TRY(stack.set(0, d));
-
-  res = TRY(res.ret(0));
-
-  return res;
+  return stack.ret(d);
 }
 
 Result<StackFrame> stdlib_array(const StackFrame& stack) {
   auto params = TRY(stack.get(0));
 
-  auto res = TRY(stack.set(0, params));
-
-  res = TRY(res.ret(0));
-
-  return res;
+  return stack.ret(params);
 }
 
 Result<StackFrame> stdlib_get(const StackFrame& stack) {
@@ -214,11 +202,7 @@ Result<StackFrame> stdlib_get(const StackFrame& stack) {
 
   auto val = TRY(collection.get(key));
 
-  auto res = TRY(stack.set(0, val));
-
-  res = TRY(res.ret(0));
-
-  return res;
+  return stack.ret(val);
 }
 
 Result<StackFrame> stdlib_set(const StackFrame& stack) {
@@ -232,11 +216,7 @@ Result<StackFrame> stdlib_set(const StackFrame& stack) {
 
   collection = TRY(collection.set(key, value));
 
-  auto res = TRY(stack.set(0, collection));
-
-  res = TRY(res.ret(0));
-
-  return res;
+  return stack.ret(collection);
 }
 
 Result<StackFrame> stdlib_srcloc(const StackFrame& stack) {
@@ -275,11 +255,7 @@ Result<StackFrame> stdlib_srcloc(const StackFrame& stack) {
 
   auto val = Value(TRY(SrcLoc::create(sr)));
 
-  auto res = TRY(stack.set(0, val));
-
-  res = TRY(res.ret(0));
-
-  return res;
+  return stack.ret(val);
 }
 
 Result<StackFrame> stdlib_size(const StackFrame& stack) {
@@ -293,11 +269,7 @@ Result<StackFrame> stdlib_size(const StackFrame& stack) {
 
   auto val = Value(TRY(Int64::create((int64_t)psize)));
 
-  auto res = TRY(stack.set(0, val));
-
-  res = TRY(res.ret(0));
-
-  return res;
+  return stack.ret(val);
 }
 
 Result<StackFrame> stdlib_map(const StackFrame& stack_param) {
@@ -347,10 +319,7 @@ Result<StackFrame> stdlib_map(const StackFrame& stack_param) {
 
   accumulator = TRY(reverse(accumulator));
 
-  auto res = TRY(stack.set(0, accumulator));
-  res = TRY(res.ret(0));
-
-  return res;
+  return stack.ret(accumulator);
 }
 
 Result<StackFrame> stdlib_error(const StackFrame& stack) {
@@ -444,11 +413,7 @@ Result<StackFrame> stdlib_task(const StackFrame& stack) {
 
   auto val = Value(TRY(Task::create(num_task_id, *task_params.to<Array>())));
 
-  auto res = TRY(stack.set(0, val));
-
-  res = TRY(res.ret(0));
-
-  return res;
+  return stack.ret(val);
 }
 
 Result<StackFrame> stdlib_is_task(const StackFrame& stack) {
@@ -461,11 +426,7 @@ Result<StackFrame> stdlib_is_task(const StackFrame& stack) {
 
   auto val = Value(TRY(Bool::create(task.is<Task>())));
 
-  auto res = TRY(stack.set(0, val));
-
-  res = TRY(res.ret(0));
-
-  return res;
+  return stack.ret(val);
 }
 
 Result<StackFrame> stdlib_guard(const StackFrame& stack) {
@@ -540,11 +501,7 @@ Result<StackFrame> stdlib_serialize(const StackFrame& stack) {
   auto val = TRY(params.get(0));
   auto serialized = Value(TRY(serialize(val)));
 
-  auto res = TRY(stack.set(0, serialized));
-
-  res = TRY(res.ret(0));
-
-  return res;
+  return stack.ret(serialized);
 }
 
 Result<StackFrame> stdlib_deserialize(const StackFrame& stack) {
@@ -559,11 +516,7 @@ Result<StackFrame> stdlib_deserialize(const StackFrame& stack) {
   if (!val.is<ByteArray>()) return ERROR(TypeMismatch);
   auto deserialized = TRY(deserialize(*val.to<ByteArray>()));
 
-  auto res = TRY(stack.set(0, deserialized));
-
-  res = TRY(res.ret(0));
-
-  return res;
+  return stack.ret(deserialized);
 }
 
 Result<StackFrame> stdlib_disassemble(const StackFrame& stack) {
@@ -593,12 +546,9 @@ Result<StackFrame> stdlib_disassemble(const StackFrame& stack) {
     return ERROR(TypeMismatch);
   }
 
-  auto res = TRY(stack.set(0, disassembled));
-
-  res = TRY(res.ret(0));
-
-  return res;
+  return stack.ret(disassembled);
 }
+
 #define STDLIB_FUNCTION(name, fun, id) \
   [(uint64_t)StdlibFunctionId::id] = {name, StdlibFunctionId::id, stdlib_##fun}