<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Apr 28, 2020, at 1:07 AM, Ben Gamari <<a href="mailto:ben@smart-cactus.org" class="">ben@smart-cactus.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><span style="caret-color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Sounds like it would be worth a quick try.</span></div></blockquote></div><br class=""><div class="">I agree with Ben. I generally expect not to see nested casts -- the Cast constructor should rarely (never?) appear as an expression outside of mkCast. But you're right about the missing optimization opportunity if we do the naive thing.</div><div class=""><br class=""></div><div class="">Let us know if you run into trouble with the "quick try"!</div><div class=""><br class=""></div><div class="">Richard</div></body></html>