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libstdc++-v3/ChangeLog: * include/bits/stl_deque.h (std::operator-(deque::iterator, deque::iterator)): Replace if/then with a null pointer test.
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.