<p></p>
<blockquote>
<p>It broke when I merged one of the gem updates - my assumption was that the gem in question had previously been requiring open3 and no longer was.</p>
</blockquote>
<p>Ah, fair enough. I didn't figure that out from the commit message, but that context explains everything.</p>
<blockquote>
<p>In any case as a general rule I believe anything in stdlib (as against core) need a require before using it?</p>
</blockquote>
<p>Yeah, stdlib seems to be an edge-case here, where core doesn't need requiring, and gems don't either. I think my curiosity was mainly because I've removed unnecessary require statements from the codebase previously, so I'm interested to learn why they are sometimes necessary.</p>

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