diff --git a/vm/src/builtins.rs b/vm/src/builtins.rs
index c8a611f37..7f6fd824f 100644
--- a/vm/src/builtins.rs
+++ b/vm/src/builtins.rs
@@ -850,14 +850,9 @@ pub fn make_module(ctx: &PyContext) -> PyObjectRef {
         },
         ctx.type_type(),
     );
-    let obj = PyObject::new(
-        PyObjectKind::Module {
-            name: "__builtins__".to_string(),
-            dict: scope,
-        },
-        ctx.type_type(),
-    );
-    obj
+    let mod_name = "__builtins__".to_string();
+    let py_mod = ctx.new_module(&mod_name, scope);
+    py_mod
 }
 
 pub fn builtin_build_class_(vm: &mut VirtualMachine, mut args: PyFuncArgs) -> PyResult {
diff --git a/vm/src/obj/objfloat.rs b/vm/src/obj/objfloat.rs
index cc248c65b..f5ba47476 100644
--- a/vm/src/obj/objfloat.rs
+++ b/vm/src/obj/objfloat.rs
@@ -42,8 +42,15 @@ pub fn get_value(obj: &PyObjectRef) -> f64 {
 pub fn make_float(vm: &mut VirtualMachine, obj: &PyObjectRef) -> Result<f64, PyObjectRef> {
     if objtype::isinstance(obj, &vm.ctx.float_type()) {
         Ok(get_value(obj))
-    } else if objtype::isinstance(obj, &vm.ctx.int_type()) {
-        Ok(objint::get_value(obj).to_f64().unwrap())
+    } else if let Ok(method) = vm.get_method(obj.clone(), "__float__") {
+        let res = vm.invoke(
+            method,
+            PyFuncArgs {
+                args: vec![],
+                kwargs: vec![],
+            },
+        )?;
+        Ok(get_value(&res))
     } else {
         Err(vm.new_type_error(format!("Cannot cast {:?} to float", obj)))
     }
diff --git a/vm/src/obj/objint.rs b/vm/src/obj/objint.rs
index d62b3f121..c413c3929 100644
--- a/vm/src/obj/objint.rs
+++ b/vm/src/obj/objint.rs
@@ -201,6 +201,12 @@ fn int_add(vm: &mut VirtualMachine, args: PyFuncArgs) -> PyResult {
     }
 }
 
+fn int_float(vm: &mut VirtualMachine, args: PyFuncArgs) -> PyResult {
+    arg_check!(vm, args, required = [(i, Some(vm.ctx.int_type()))]);
+    let i = get_value(i);
+    Ok(vm.ctx.new_float(i.to_f64().unwrap()))
+}
+
 fn int_floordiv(vm: &mut VirtualMachine, args: PyFuncArgs) -> PyResult {
     arg_check!(
         vm,
@@ -391,6 +397,7 @@ pub fn init(context: &PyContext) {
     int_type.set_attr("__add__", context.new_rustfunc(int_add));
     int_type.set_attr("__and__", context.new_rustfunc(int_and));
     int_type.set_attr("__divmod__", context.new_rustfunc(int_divmod));
+    int_type.set_attr("__float__", context.new_rustfunc(int_float));
     int_type.set_attr("__floordiv__", context.new_rustfunc(int_floordiv));
     int_type.set_attr("__hash__", context.new_rustfunc(int_hash));
     int_type.set_attr("__new__", context.new_rustfunc(int_new));
diff --git a/vm/src/obj/objtype.rs b/vm/src/obj/objtype.rs
index 86818cf98..01fa4ecb9 100644
--- a/vm/src/obj/objtype.rs
+++ b/vm/src/obj/objtype.rs
@@ -81,7 +81,7 @@ pub fn get_type_name(typ: &PyObjectRef) -> String {
     {
         name.clone()
     } else {
-        panic!("Cannot get type_name of non-type type");
+        panic!("Cannot get type_name of non-type type {:?}", typ);
     }
 }
 
diff --git a/vm/src/vm.rs b/vm/src/vm.rs
index 6494bb977..8679e4545 100644
--- a/vm/src/vm.rs
+++ b/vm/src/vm.rs
@@ -42,10 +42,15 @@ impl VirtualMachine {
     /// Create a new `VirtualMachine` structure.
     pub fn new() -> VirtualMachine {
         let ctx = PyContext::new();
+
+        // Hard-core modules:
         let builtins = builtins::make_module(&ctx);
         let sysmod = sysmodule::mk_module(&ctx);
+
         // Add builtins as builtins module:
-        // sysmod.get_attr("modules").unwrap().set_item("builtins", builtins.clone());
+        let modules = sysmod.get_attr("modules").unwrap();
+        modules.set_item("builtins", builtins.clone());
+
         let stdlib_inits = stdlib::get_module_inits();
         VirtualMachine {
             builtins: builtins,