cking_io_expected</span> <span class="keyword">of</span> string</span></code></div><div class="spec-doc"><p>The following functions expect that their inputs process handles were executed with a <a href="Core/Cmd/index.html#type-t"><code>Cmd.t</code></a> instance where <code>block=false</code> and will raise this exception if it was not. We could, in principle, prevent this at a type level, but non-blocking I/O operations were added quite late in the design of this library, and I'm still debating whether add