While researching LWG#2244, I noticed we weren't testing that eofbit was being cleared. Now we are

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@249593 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/input.output/iostream.format/input.streams/istream.unformatted/seekg.pass.cpp

@@ -63,4 +63,13 @@ int main()
         is.seekg(-1);
         assert(is.fail());
     }
+    {
+        testbuf<char> sb(" 123456789");
+        std::istream is(&sb);
+        is.setstate(std::ios_base::eofbit);
+        assert(is.eof());
+        is.seekg(5);
+        assert(is.good());
+        assert(!is.eof());
+    }
 }