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It covers the cases when the sentry object returns false and when an exception was thrown. Corresponding standard paragraph is C++14 [istream.unformatted]p21: In any case, if n is greater than zero, it then stores a null character (using charT()) into the next successive location of the array. Patch by Reimar Döffinger. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@318862 91177308-0d34-0410-b5e6-96231b3b80d8