[PATCH] Five patches for std::experimental::filesystem

[Jonathan Wakely]

On 24/10/16 17:50 +0100, Jonathan Wakely wrote:
>   Make directory iterators become end iterator on error
>       * src/filesystem/dir.cc (open_dir): Return same value for errors
>       whether ignored or not.
>       (_Dir::advance(error_code*, directory_options)): Return false on
>       error.
>       (directory_iterator(const path&, directory_options, error_code*)):
>       Create end iterator on error (LWG 2723).
>       (recursive_directory_iterator(const path&, directory_options,
>       error_code*)): Likewise.
>       * testsuite/experimental/filesystem/iterators/directory_iterator.cc:
>       Update expected behaviour on error.
>       * testsuite/experimental/filesystem/iterators/
>       recursive_directory_iterator.cc: Likewise.

I missed the case where recursing into a sub-directory fails, and that
happened to be the one bit of the test where I didn't add a new check.

Tested x86_64-linux, committed to trunk.

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