diff --git a/api/any.hpp b/api/any.hpp
index aac8b8a0f..55148c0ba 100644
--- a/api/any.hpp
+++ b/api/any.hpp
@@ -288,7 +288,7 @@ namespace jule
             if (src.operator!=(nullptr))
                 stream << src.type->to_str(src.data);
             else
-                stream << 0;
+                stream << "<nil>";
             return stream;
         }
     };
diff --git a/api/fn.hpp b/api/fn.hpp
index 2f3e55dee..d0bfd4366 100644
--- a/api/fn.hpp
+++ b/api/fn.hpp
@@ -89,19 +89,19 @@ namespace jule
             return this->_addr;
         }
 
-        inline Fn<Function>& operator=(std::nullptr_t) noexcept
+        inline Fn<Function> &operator=(std::nullptr_t) noexcept
         {
             this->buffer = nullptr;
             return *this;
         }
 
-        inline Fn<Function>& operator=(const std::function<Function> &function)
+        inline Fn<Function> &operator=(const std::function<Function> &function)
         {
             this->buffer = function;
             return *this;
         }
 
-        inline Fn<Function>& operator=(const Function &function)
+        inline Fn<Function> &operator=(const Function &function)
         {
             this->buffer = function;
             return *this;
@@ -130,6 +130,8 @@ namespace jule
         friend std::ostream &operator<<(std::ostream &stream,
                                         const Fn<Function> &src) noexcept
         {
+            if (src == nullptr)
+                return (stream << "<nil>");
             return (stream << (void *)src._addr);
         }
     };
diff --git a/api/ptr.hpp b/api/ptr.hpp
index dbc1a3c1a..6b9905072 100644
--- a/api/ptr.hpp
+++ b/api/ptr.hpp
@@ -320,7 +320,7 @@ namespace jule
                                                const jule::Ptr<T> &ref) noexcept
         {
             if (ref == nullptr)
-                stream << "nil";
+                stream << "<nil>";
             else
                 stream << ref.alloc;
             return stream;
diff --git a/api/trait.hpp b/api/trait.hpp
index 6819bf544..9669c518b 100644
--- a/api/trait.hpp
+++ b/api/trait.hpp
@@ -276,6 +276,8 @@ namespace jule
         friend inline std::ostream &operator<<(std::ostream &stream,
                                                const jule::Trait<Mask> &src) noexcept
         {
+            if (src == nullptr)
+                return stream << "<nil>";
             return stream << (void *)src.data.alloc;
         }
     };