rust-cpython: drop self.leak_immutable() in favor of PySharedRef wrapper

rust-cpython: drop self.leak_immutable() in favor of PySharedRef wrapper

--- a/rust/hg-cpython/src/dirstate/dirs_multiset.rs	Sun Sep 15 16:50:48 2019 +0900
+++ b/rust/hg-cpython/src/dirstate/dirs_multiset.rs	Sun Sep 15 16:59:50 2019 +0900
@@ -92,7 +92,8 @@
             })
     }
     def __iter__(&self) -> PyResult<DirsMultisetKeysIterator> {
-        let (leak_handle, leaked_ref) = unsafe { self.leak_immutable(py)? };
+        let (leak_handle, leaked_ref) =
+            unsafe { self.inner_shared(py).leak_immutable()? };
         DirsMultisetKeysIterator::from_inner(
             py,
             leak_handle,

--- a/rust/hg-cpython/src/dirstate/dirstate_map.rs	Sun Sep 15 16:50:48 2019 +0900
+++ b/rust/hg-cpython/src/dirstate/dirstate_map.rs	Sun Sep 15 16:59:50 2019 +0900
@@ -319,7 +319,8 @@
     }
 
     def keys(&self) -> PyResult<DirstateMapKeysIterator> {
-        let (leak_handle, leaked_ref) = unsafe { self.leak_immutable(py)? };
+        let (leak_handle, leaked_ref) =
+            unsafe { self.inner_shared(py).leak_immutable()? };
         DirstateMapKeysIterator::from_inner(
             py,
             leak_handle,
@@ -328,7 +329,8 @@
     }
 
     def items(&self) -> PyResult<DirstateMapItemsIterator> {
-        let (leak_handle, leaked_ref) = unsafe { self.leak_immutable(py)? };
+        let (leak_handle, leaked_ref) =
+            unsafe { self.inner_shared(py).leak_immutable()? };
         DirstateMapItemsIterator::from_inner(
             py,
             leak_handle,
@@ -337,7 +339,8 @@
     }
 
     def __iter__(&self) -> PyResult<DirstateMapKeysIterator> {
-        let (leak_handle, leaked_ref) = unsafe { self.leak_immutable(py)? };
+        let (leak_handle, leaked_ref) =
+            unsafe { self.inner_shared(py).leak_immutable()? };
         DirstateMapKeysIterator::from_inner(
             py,
             leak_handle,
@@ -454,7 +457,8 @@
     }
 
     def copymapiter(&self) -> PyResult<CopyMapKeysIterator> {
-        let (leak_handle, leaked_ref) = unsafe { self.leak_immutable(py)? };
+        let (leak_handle, leaked_ref) =
+            unsafe { self.inner_shared(py).leak_immutable()? };
         CopyMapKeysIterator::from_inner(
             py,
             leak_handle,
@@ -463,7 +467,8 @@
     }
 
     def copymapitemsiter(&self) -> PyResult<CopyMapItemsIterator> {
-        let (leak_handle, leaked_ref) = unsafe { self.leak_immutable(py)? };
+        let (leak_handle, leaked_ref) =
+            unsafe { self.inner_shared(py).leak_immutable()? };
         CopyMapItemsIterator::from_inner(
             py,
             leak_handle,

--- a/rust/hg-cpython/src/ref_sharing.rs	Sun Sep 15 16:50:48 2019 +0900
+++ b/rust/hg-cpython/src/ref_sharing.rs	Sun Sep 15 16:59:50 2019 +0900
@@ -319,14 +319,6 @@
             {
                 self.$shared_accessor(py).borrow_mut()
             }
-
-            // TODO: remove this function in favor of $shared_accessor(py)
-            unsafe fn leak_immutable<'a>(
-                &'a self,
-                py: Python<'a>,
-            ) -> PyResult<(PyLeakedRef, &'static $inner_struct)> {
-                self.$shared_accessor(py).leak_immutable()
-            }
         }
     };
 }
@@ -396,7 +388,8 @@
 ///     data inner: PySharedRefCell<MyStruct>;
 ///
 ///     def __iter__(&self) -> PyResult<MyTypeItemsIterator> {
-///         let (leak_handle, leaked_ref) = unsafe { self.leak_immutable(py)? };
+///         let (leak_handle, leaked_ref) =
+///             unsafe { self.inner_shared(py).leak_immutable()? };
 ///         MyTypeItemsIterator::from_inner(
 ///             py,
 ///             leak_handle,