diff --git a/CMakeLists.txt b/CMakeLists.txt
index aa73c32..3e5b31b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -65,6 +65,7 @@ set(LISP_TESTS
   logic
   dict
   function
+  collections
 )
 
 
diff --git a/src/common.cpp b/src/common.cpp
index d930da0..db504bf 100644
--- a/src/common.cpp
+++ b/src/common.cpp
@@ -229,7 +229,7 @@ Result<void> Stack::settop(uint64_t idx) {
   return Result<void>();
 }
 
-Result<Pair> Pair::create(Value& first, Value& rest) {
+Result<Pair> Pair::create(const Value& first, const Value& rest) {
   auto pod = TRY(arena_alloc<PodPair>());
   pod->header.tag = Tag::Pair;
   pod->first = first.pod();
diff --git a/src/common.hpp b/src/common.hpp
index bd4db7a..4d4233c 100644
--- a/src/common.hpp
+++ b/src/common.hpp
@@ -674,7 +674,7 @@ class Pair : public Object {
   virtual void move(Object* obj) final { new (obj) Pair(std::move(_value)); }
 
   static Result<Pair> create(PodPair* obj) { return Pair(TRY(MkGcRoot(obj))); }
-  static Result<Pair> create(Value& first, Value& rest);
+  static Result<Pair> create(const Value& first, const Value& rest);
   static Result<Pair> create(const Array& arr);
 
   virtual Result<Value> get(const Value& key) const final;
diff --git a/src/reader.cpp b/src/reader.cpp
index b597b05..d0e5698 100644
--- a/src/reader.cpp
+++ b/src/reader.cpp
@@ -115,7 +115,35 @@ Result<Value> Reader::read_list() {
   return ERROR(ReadError);
 }
 
-Result<Value> Reader::read_array() {
+Result<Value> Reader::read_array_code() {
+  if (!match('[')) return ERROR(ReadError);
+
+  forward();
+
+  auto sym = Value(TRY(Symbol::create("array")));
+  auto res = Value(TRY(Pair::create(sym, TRY(Nil::create()))));
+
+  while (1) {
+    forward_whitespace();
+
+    if (is_eof()) {
+      return ERROR(ReadError);
+    }
+
+    if (match(']')) {
+      forward();
+      return reverse(res);
+    }
+
+    auto val = TRY(read_one());
+
+    res = TRY(Pair::create(val, res));
+  }
+
+  return ERROR(ReadError);
+}
+
+Result<Value> Reader::read_array_data() {
   if (!match('[')) return ERROR(ReadError);
 
   forward();
@@ -142,7 +170,43 @@ Result<Value> Reader::read_array() {
   return ERROR(ReadError);
 }
 
-Result<Value> Reader::read_dict() {
+Result<Value> Reader::read_array() {
+  if (_as_code) return read_array_code();
+
+  return read_array_data();
+}
+
+Result<Value> Reader::read_dict_code() {
+  if (!match('{')) return ERROR(ReadError);
+
+  forward();
+
+  auto sym = Value(TRY(Symbol::create("dict")));
+  auto res = Value(TRY(Pair::create(sym, TRY(Nil::create()))));
+
+  while (1) {
+    forward_whitespace();
+
+    if (is_eof()) {
+      return ERROR(ReadError);
+    }
+
+    if (match('}')) {
+      forward();
+      return reverse(res);
+    }
+
+    auto val1 = TRY(read_one());
+    auto val2 = TRY(read_one());
+
+    res = TRY(Pair::create(val1, res));
+    res = TRY(Pair::create(val2, res));
+  }
+
+  return ERROR(ReadError);
+}
+
+Result<Value> Reader::read_dict_data() {
   if (!match('{')) return ERROR(ReadError);
 
   forward();
@@ -169,6 +233,13 @@ Result<Value> Reader::read_dict() {
 
   return ERROR(ReadError);
 }
+
+Result<Value> Reader::read_dict() {
+  if (_as_code) return read_dict_code();
+
+  return read_dict_data();
+}
+
 Result<Value> Reader::read_bool() {
   if (match("true")) {
     forward(4);
diff --git a/src/reader.hpp b/src/reader.hpp
index 01d7d2f..67225fe 100644
--- a/src/reader.hpp
+++ b/src/reader.hpp
@@ -5,7 +5,8 @@
 
 class Reader {
  public:
-  Reader(const String& str) : _str(str) {}
+  Reader(const String& str, bool as_code = true)
+      : _str(str), _as_code(as_code) {}
 
   Result<Value> read_one();
   Result<Value> read_multiple();
@@ -29,7 +30,11 @@ class Reader {
   Result<Value> read_list();
   Result<Value> read_string();
   Result<Value> read_array();
+  Result<Value> read_array_code();
+  Result<Value> read_array_data();
   Result<Value> read_dict();
+  Result<Value> read_dict_code();
+  Result<Value> read_dict_data();
   Result<Value> read_number();
   Result<Value> read_symbol();
   Result<Value> read_bool();
@@ -40,6 +45,7 @@ class Reader {
   bool match(char c);
 
   const String& _str;
+  bool _as_code;
   SourcePosition position_{1, 1, 0};
 };
 
diff --git a/src/stdlib.cpp b/src/stdlib.cpp
index ce0308f..06b4e8a 100644
--- a/src/stdlib.cpp
+++ b/src/stdlib.cpp
@@ -75,7 +75,6 @@ Result<Value> stdlib_list(const Array& params) {
 }
 
 Result<Value> stdlib_array(const Array& params) {
-  debug_print(params);
   Array array_copy = TRY(params.copy());
   return Value(std::move(array_copy));
 }