Remove PyPaylod::special_retrieve

vm/src/builtins/int.rs

@@ -53,10 +53,6 @@ impl PyPayload for PyInt {
     fn into_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
         vm.ctx.new_int(self.value).into()
     }
-
-    fn special_retrieve(vm: &VirtualMachine, obj: &PyObject) -> Option<PyResult<PyRef<Self>>> {
-        Some(obj.try_index(vm))
-    }
 }
 
 macro_rules! impl_into_pyobject_int {

vm/src/convert/try_from.rs

@@ -44,14 +44,11 @@ impl PyObject {
         F: Fn(&T) -> PyResult<R>,
     {
         let class = T::class(vm);
-        let special;
         let py_ref = if self.fast_isinstance(class) {
             self.downcast_ref()
                 .ok_or_else(|| vm.new_downcast_runtime_error(class, self))?
         } else {
-            special = T::special_retrieve(vm, self)
-                .unwrap_or_else(|| Err(vm.new_downcast_type_error(class, self)))?;
-            &special
+            return Err(vm.new_downcast_type_error(class, self));
         };
         f(py_ref)
     }
@@ -74,8 +71,7 @@ where
             obj.downcast()
                 .map_err(|obj| vm.new_downcast_runtime_error(class, &obj))
         } else {
-            T::special_retrieve(vm, &obj)
-                .unwrap_or_else(|| Err(vm.new_downcast_type_error(class, &obj)))
+            Err(vm.new_downcast_type_error(class, &obj))
         }
     }
 }

vm/src/object/payload.rs

@@ -1,4 +1,4 @@
-use super::{Py, PyObject, PyObjectRef, PyRef, PyResult};
+use super::{Py, PyObjectRef, PyRef, PyResult};
 use crate::{
     builtins::{PyBaseExceptionRef, PyType, PyTypeRef},
     types::PyTypeFlags,
@@ -23,11 +23,6 @@ pub trait PyPayload: std::fmt::Debug + PyThreadingConstraint + Sized + 'static {
         self.into_ref(vm).into()
     }
 
-    #[inline(always)]
-    fn special_retrieve(_vm: &VirtualMachine, _obj: &PyObject) -> Option<PyResult<PyRef<Self>>> {
-        None
-    }
-
     #[inline]
     fn _into_ref(self, cls: PyTypeRef, vm: &VirtualMachine) -> PyRef<Self> {
         let dict = if cls.slots.flags.has_feature(PyTypeFlags::HAS_DICT) {