EOF flag not set on exhausted input streams.

[mefyl]

When reaching the end of a stream while parsing JSON, the eofbit is not set.

std::stringstream s;
try { json j ; j >> s; } catch (...) {}
s.eof(); // false

This seems like a reasonable expected behaviour, as our existing code relies of eofbit to determine when the end of a continuous stream of json commands is reached.

[nlohmann]

Thanks for reporting and thanks for opening a PR! As @gregmarr already pointed out, it is important that subsequent reads from a stream are still working.

[mefyl]

Addressed in #1343.