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<div>Based on the response, it seems like there's some interest, but the team wouldn't get to it until after Swift 3 at the earliest. Should I open a pull request to the swift-evolution repo to allow feedback and prevent duplicate proposals?</div>
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<div>- Steve</div>
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<span style="font-weight:bold">From: </span><<a href="mailto:clattner@apple.com">clattner@apple.com</a>> on behalf of Chris Lattner <<a href="mailto:clattner@apple.com">clattner@apple.com</a>><br>
<span style="font-weight:bold">Date: </span>Monday, February 8, 2016 at 1:13 PM<br>
<span style="font-weight:bold">To: </span>Steve Richey <<a href="mailto:srichey@gowithfloat.com">srichey@gowithfloat.com</a>><br>
<span style="font-weight:bold">Cc: </span>"<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>" <<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>><br>
<span style="font-weight:bold">Subject: </span>Re: [swift-evolution] Proposal: allow arbitrary compile-time code execution<br>
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<div class="">On Feb 7, 2016, at 8:29 PM, Steve Richey via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div>
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<div class="">It is not uncommon to want to run code at build time. Xcode solves this need by allowing "Build Phases", which are often shell scripts which handle compile-time tasks.</div>
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<div class="">It may be beneficial to Swift developers, especially those who are not programming on platforms supported by Xcode, to handle compile-time tasks in a powerful and expressive language with which they are already familiar: Swift!</div>
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<div class="">In short, I propose the addition of a `#run` expression that allows the execution of code at compile time. This syntax and concept are borrowed from the programming language Jai (<a href="https://sites.google.com/site/jailanguageprimer/#TOC-Arbitrary-Compile-Time-Code-Execution" class="">https://sites.google.com/site/jailanguageprimer/#TOC-Arbitrary-Compile-Time-Code-Execution</a>)
but the syntax fits nicely with other special expression syntax in Swift such as `#available`, `#selector`, `#file`, and so on.</div>
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<div>Something like this would definitely be interesting to build out. We should investigate it post-Swift 3 in the context of a hygienic macro system.</div>
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<div>-Chris</div>
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