<div dir="ltr"><br><br><div class="gmail_quote"><div dir="ltr">On Mon, 24 Sep 2018 at 18:17, Oleg Grenrus <<a href="mailto:oleg.grenrus@iki.fi">oleg.grenrus@iki.fi</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div><span style="background-color:rgba(255,255,255,0)">The problem is that "All instances" is hard to pin point. We have open world assumption, so instances can be added later (in the dependency tree). Should they be cloned too? And even of you restrict to "instances visible at clonetype definition", that's IMHO not a good idea either, as it's implicit and volatile set (editing imports changes may change the set).</span></div></div></blockquote><div><br></div><div>A clone type says "both the types are exactly the same in all semantics except that they cannot be used interchangeably", it is just like "type" except that the types are treated as being different. The way visible instances change for the original type by editing imports, the same way they change for the clone type as well, I do not see a problem there. However, the two types may diverge if we define more instances for any of them after cloning and that may potentially be a source of confusion?</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div id="m_4731960923457126086AppleMailSignature">Haskell's heavy type machinery exists so we can explicitly and exactly say what we need or want. </div></div></blockquote><div><br></div><div>Mortal programmers would love to have "conveniently" added to that list :-)</div><div> </div><div>-harendra</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><blockquote type="cite"><div>
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