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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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             rustfmt.toml
        
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        Georges Racinet
    
rust: rustfmt config for hg-direct-ffi...

              r40337
            
      max_width = 79

      wrap_comments = true

      error_on_line_overflow = true

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Georges Racinet rust: rustfmt config for hg-direct-ffi...	r40337	max_width = 79
		wrap_comments = true
		error_on_line_overflow = true