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rust-cpython: add stub wrapper that'll prevent leaked data from being mutated...

rust-cpython: add stub wrapper that'll prevent leaked data from being mutated In order to allow mutation of PySharedRefCell value while PyLeaked reference exists, we need yet another "borrow" scope where mutation is prohibited. try_borrow<'a> and try_borrow_mut<'a> defines the "borrow" scope <'a>. The subsequent patches will implement leak counter based on this scope. PyLeakedRef<T> and PyLeakedRefMut<T> could be unified to PyLeakedRef<&T> and PyLeakedRef<&mut T> respectively, but I didn't do that since it seemed a bit weird that deref_mut() would return a mutable reference to an immutable reference.

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        Georges Racinet
    
rust: iterator bindings to C code...

              r40308
            
      // Copyright 2018 Georges Racinet <gracinet@anybox.fr>

      //

      // This software may be used and distributed according to the terms of the

      // GNU General Public License version 2 or any later version.

      //! Bindings for CPython extension code

      //!

      //! This exposes methods to build and use a `rustlazyancestors` iterator

      //! from C code, using an index and its parents function that are passed

      //! from the caller at instantiation.

      extern crate hg;

      extern crate libc;

      mod ancestors;

        Georges Racinet
    
rust: rustlazyancestors.__contains__...

              r40336
            
      pub use ancestors::{

          rustlazyancestors_contains, rustlazyancestors_drop,

          rustlazyancestors_init, rustlazyancestors_next,

      };

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Georges Racinet rust: iterator bindings to C code...	r40308	// Copyright 2018 Georges Racinet <gracinet@anybox.fr>
		//
		// This software may be used and distributed according to the terms of the
		// GNU General Public License version 2 or any later version.

		//! Bindings for CPython extension code
		//!
		//! This exposes methods to build and use a `rustlazyancestors` iterator
		//! from C code, using an index and its parents function that are passed
		//! from the caller at instantiation.

		extern crate hg;
		extern crate libc;

		mod ancestors;
Georges Racinet rust: rustlazyancestors.__contains__...	r40336	pub use ancestors::{
		rustlazyancestors_contains, rustlazyancestors_drop,
		rustlazyancestors_init, rustlazyancestors_next,
		};