dex of the next item if `x` is not
present. This is the correct insert index for `x` within `arr`.</pre></div><hr><div class="binding"><span id="misc/caperr" class="binding-sym">misc/caperr</span> <span class="binding-type">macro</span> <span class="binding-type"><a href="https://github.com/janet-lang/spork/blob/7fd743ac09e857fe0ebd333bd7a56cd0df3876c3//spork/misc.janet#L349">source</a></span> <pre class="binding-text">(caperr &amp; body)

Captures the standard error output of the variadic `body` and return