implement PySequenceMethods

src/instance.rs

@@ -174,7 +174,7 @@ impl<'py, T> Py2<'py, T> {
     #[doc(hidden)] // public and doc(hidden) to use in examples and tests for now
     pub fn borrowed_from_gil_ref<'a>(gil_ref: &'a &'py T::AsRefTarget) -> &'a Self
     where
-        T: PyTypeInfo,
+        T: HasPyGilRef,
     {
         // Safety: &'py T::AsRefTarget is expected to be a Python pointer,
         // so &'a &'py T::AsRefTarget has the same layout as &'a Py2<'py, T>

src/prelude.rs

@@ -24,5 +24,6 @@ pub use pyo3_macros::{pyclass, pyfunction, pymethods, pymodule, FromPyObject};
 pub use crate::wrap_pyfunction;
 
 // Expected to become public API in 0.21
-// pub(crate) use crate::instance::Py2; // Will be stabilized with a different name
-// pub(crate) use crate::types::any::PyAnyMethods;
+pub(crate) use crate::instance::Py2; // Will be stabilized with a different name
+pub(crate) use crate::types::any::PyAnyMethods;
+// pub(crate) use crate::types::sequence::PySequenceMethods;

src/types/mod.rs

@@ -296,7 +296,7 @@ mod notimplemented;
 mod num;
 #[cfg(not(PyPy))]
 mod pysuper;
-mod sequence;
+pub(crate) mod sequence;
 pub(crate) mod set;
 mod slice;
 mod string;