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Improve CPython compatibility related with PyBoundMethod #7476

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Merged
youknowone merged 3 commits into from
Mar 20, 2026
+31 −7
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Improve CPython compatibility related with PyBoundMethod #7476

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333af80
Add GetDescriptor for PyBoundMethod (return self)
moreal Mar 20, 2026
1a3fd9f
Add constructor validation for PyBoundMethod
moreal Mar 20, 2026
b725ca7
Fix PyBoundMethod __reduce__ to propagate errors
moreal Mar 20, 2026
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Add GetDescriptor for PyBoundMethod (return self) 
CPython's method_descr_get always returns the bound method unchanged.
This preserves the original binding when __get__ is called on an
already-bound method (e.g. a.meth.__get__(b, B) still returns a).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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@moreal @claude
moreal and claude committed Mar 20, 2026
commit 333af80f44f04526e47b558b85e20481eab49f7f
1 change: 0 additions & 1 deletion Lib/test/test_descr.py
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Expand Up @@ -5130,7 +5130,6 @@ class Child(Parent):
gc.collect()
self.assertEqual(Parent.__subclasses__(), [])

@unittest.expectedFailure # TODO: RUSTPYTHON
def test_instance_method_get_behavior(self):
# test case for gh-113157

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21 changes: 20 additions & 1 deletion crates/vm/src/builtins/function.rs
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Expand Up @@ -1216,6 +1216,17 @@ impl GetAttr for PyBoundMethod {
}
}

impl GetDescriptor for PyBoundMethod {
fn descr_get(
zelf: PyObjectRef,
_obj: Option<PyObjectRef>,
_cls: Option<PyObjectRef>,
_vm: &VirtualMachine,
) -> PyResult {
Ok(zelf)
}
}

#[derive(FromArgs)]
pub struct PyBoundMethodNewArgs {
#[pyarg(positional)]
Expand Down Expand Up @@ -1258,7 +1269,15 @@ impl PyBoundMethod {
}

#[pyclass(
with(Callable, Comparable, Hashable, GetAttr, Constructor, Representable),
with(
Callable,
Comparable,
Hashable,
GetAttr,
GetDescriptor,
Constructor,
Representable
),
flags(IMMUTABLETYPE, HAS_WEAKREF)
)]
impl PyBoundMethod {
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