"#type-t">t</a></span> <span class="arrow">&#45;&gt;</span></span> string * string</span></code></div><div class="spec-doc"><p>Takes a process handle where both stdout and stderr are set to pipe as input and reads streams from each into a string, returning the pair of strings. Raises <a href="#exception-Non_blocking_io_expected"><code>Non_blocking_io_expected</code></a> if I/O is blocking.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-fold_both_proc"><a href="#val-fold_both_