Fix ub

source/eval/object.cpp

@@ -11,6 +11,13 @@
 #include <fmt/ranges.h>
 #include <overloaded.hpp>
 
+builtin_object::builtin_object(const builtin_function_expression* bltn)
+
+    : function_object {bltn, nullptr}
+    , builtin {bltn}
+{
+}
+
 auto operator<<(std::ostream& ostrm, object::object_type type) -> std::ostream&
 {
     using enum object::object_type;
@@ -59,7 +66,7 @@ auto integer_object::hash_key() const -> hash_key_type
 
 auto builtin_object::inspect() const -> std::string
 {
-    return fmt::format("builtin {}({}){{...}}", builtin->name, fmt::join(builtin->parameters, ", "));
+    return fmt::format("fn<builtin>{}({}){{...}}", builtin->name, fmt::join(builtin->parameters, ", "));
 }
 
 auto function_object::inspect() const -> std::string

source/eval/object.hpp

@@ -300,20 +300,17 @@ struct closure_object : object
 
     [[nodiscard]] auto type() const -> object_type override { return object_type::closure; }
 
-    [[nodiscard]] auto inspect() const -> std::string override { return "closure{...}"; }
+    [[nodiscard]] auto inspect() const -> std::string override { return "fn<closure>{...}"; }
 
     const compiled_function_object* fn {};
     std::vector<const object*> free;
 };
 
 struct builtin_function_expression;
 
-struct builtin_object : object
+struct builtin_object : function_object
 {
-    explicit builtin_object(const builtin_function_expression* bltn)
-        : builtin {bltn}
-    {
-    }
+    explicit builtin_object(const builtin_function_expression* bltn);
 
     [[nodiscard]] auto type() const -> object_type override { return object_type::builtin; }