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dirs: fix out-of-bounds access in Py3...

dirs: fix out-of-bounds access in Py3 The hack for mutating Python's variable-length integers that was ported to py3 in (dirs: port PyInt code to work on Python 3, 2016-10-08) was reading from ob_digit[1] instead of ob_digit[0] for some reason. Space for ob_digit[1] would only be allocated for integers larger than 30 bits, so we ended up writing to unallocated memory. Also, we would write an integer that's 2^30 times too large, so we would never free these integers. Found by AddressSanitizer. Differential Revision: https://phab.mercurial-scm.org/D7597

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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