weakref.__reversed__ fixed (RustPython#4780)

Author: jinnarajin

Lib/test/test_weakref.py

@@ -464,8 +464,6 @@ def __iter__(self):
         with self.assertRaisesRegex(TypeError, msg):
             list(a)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_proxy_reversed(self):
         class MyObj:
             def __len__(self):

vm/src/builtins/weakproxy.rs

@@ -5,6 +5,7 @@ use crate::{
     common::hash::PyHash,
     function::{OptionalArg, PyComparisonValue, PySetterValue},
     protocol::{PyIter, PyIterReturn, PyMappingMethods, PySequenceMethods},
+    stdlib::builtins::reversed,
     types::{
         AsMapping, AsSequence, Comparable, Constructor, GetAttr, Hashable, IterNext, Iterable,
         PyComparisonOp, Representable, SetAttr,
@@ -98,6 +99,11 @@ impl PyWeakProxy {
         self.try_upgrade(vm)?.bytes(vm)
     }
 
+    #[pymethod(magic)]
+    fn reversed(&self, vm: &VirtualMachine) -> PyResult {
+        let obj = self.try_upgrade(vm)?;
+        reversed(obj, vm)
+    }
     #[pymethod(magic)]
     fn contains(&self, needle: PyObjectRef, vm: &VirtualMachine) -> PyResult<bool> {
         self.try_upgrade(vm)?.to_sequence(vm).contains(&needle, vm)

vm/src/stdlib/builtins.rs

@@ -3,7 +3,7 @@
 //! Implements the list of [builtin Python functions](https://docs.python.org/3/library/builtins.html).
 use crate::{builtins::PyModule, class::PyClassImpl, Py, VirtualMachine};
 pub(crate) use builtins::{__module_def, DOC};
-pub use builtins::{ascii, print};
+pub use builtins::{ascii, print, reversed};
 
 #[pymodule]
 mod builtins {
@@ -686,7 +686,7 @@ mod builtins {
     }
 
     #[pyfunction]
-    fn reversed(obj: PyObjectRef, vm: &VirtualMachine) -> PyResult {
+    pub fn reversed(obj: PyObjectRef, vm: &VirtualMachine) -> PyResult {
         if let Some(reversed_method) = vm.get_method(obj.clone(), identifier!(vm, __reversed__)) {
             reversed_method?.call((), vm)
         } else {