<div dir="ltr">On Mon, Aug 1, 2016 at 4:41 PM, Anton Zhilin via swift-evolution <span dir="ltr"><<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>></span> wrote:<br><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Disclaimer: I have not (yet) prepared a proposal, or even something that could be considered a draft, but I want to hear public opinion on the topic.<div><br></div><div>SE-0077 (about precedence groups) has been successfully implemented for Swift 3. (A thousand thanks to John McCall!) It suggests a model where we can prohibit certain operators from standing next to each other.</div><div><br></div><div>This was intended to be the second part of that proposal. We now have to think if we should drop some precedence relationships between standard operators. Here are examples of parentheses dropping that can be ambiguous to reader:</div><div><br></div><div>1/3 as Double // should we prohibit this?</div></div></blockquote><div><br></div><div>Why should we? I would absolutely want that to work exactly as it does now (0.333333...).</div><div><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>1 | 2 ^ 3 // or this?</div></div></blockquote><div><br></div><div>No. Both of those are bitwise operations. They are often used together. They have a refined relative precedence in Swift that makes sense.</div><div><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>a && b | c // or this?</div></div></blockquote><div><br></div><div>Now that's more interesting. Maybe?</div><div><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Should we break standard precedence hierarchy and if yes, how?</div><div>For those involved in the mentioned proposal, how exactly should standard precedence groups relate?</div></div>
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