<div dir="ltr">Fantastic idea, it would be nice to be able to do this in such a way that it didn't bloat out a function's definition. This is similar to the code-by-contract discussions that have happened in the past. This may be breaking into macro territory though. Perhaps it could be expressed like this:<div><br></div><div><font face="monospace, monospace">@callVerification func verifyNoLiterals(inNode node: ASTNode) -> [CallVerificationError] {</font></div><div><font face="monospace, monospace"> ...</font></div><div><font face="monospace, monospace">}</font></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace">@verifyCall(noLiterals)</font></div><div><span style="font-size:13px"><font face="monospace, monospace">func precondition(success: Bool) {</font></span></div><div><span style="font-size:13px"><font face="monospace, monospace"> ...</font></span></div><div><span style="font-size:13px"><font face="monospace, monospace">}</font></span><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Feb 13, 2016 at 8:15 AM, Amir Michail via swift-evolution <span dir="ltr"><<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">For example, the Swift standard library might want to ensure that you use "preconditionFailure()" instead of "precondition(false)" since the former doesn’t get in the way of constant/variable initialization static analysis.<div><br></div><div>So maybe allow functions to have a warning clause with an abstract syntax tree parameter allowing the function to examine its usage context in the source code and issue warnings correspondingly that appear during the compile.</div><div><br></div><div>Here’s some related work: <a href="https://msdn.microsoft.com/en-us/magazine/dn879356.aspx" target="_blank">https://msdn.microsoft.com/en-us/magazine/dn879356.aspx</a></div><div><br></div></div><br>_______________________________________________<br>
swift-evolution mailing list<br>
<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a><br>
<a href="https://lists.swift.org/mailman/listinfo/swift-evolution" rel="noreferrer" target="_blank">https://lists.swift.org/mailman/listinfo/swift-evolution</a><br>
<br></blockquote></div><br></div>