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All path::iterator operations are non-throwing. Signed-off-by: Jonathan Wakely <jwakely@redhat.com> libstdc++-v3/ChangeLog: * include/bits/fs_path.h (path::iterator): Add noexcept to all member functions and friend functions. (distance): Add noexcept. (advance): Add noexcept and inline. * include/experimental/bits/fs_path.h (path::iterator): Add noexcept to all member functions.