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debugcommands: move away from line buffered output on binary stream...

debugcommands: move away from line buffered output on binary stream Line buffering on binary file objects is apparently undefined behavior in Python and emits a RuntimeWarning on Python 3.8. See https://bugs.python.org/issue32236. This commit changes the I/O logging file descriptor from line buffered to unbuffered to work around this. I'm no fan of unbuffered I/O for performance reasons. But I don't think it is an issue here given the nature of the code. With this change, test-ssh-proto.t now passes on Python 3.8. Differential Revision: https://phab.mercurial-scm.org/D7948

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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