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<div name="messageBodySection" style="font-size: 14px; font-family: -apple-system, BlinkMacSystemFont, sans-serif;">I'm really not sold about the ~> operator, as it would be easy to miss. Swift is known and loved for the expressiveness of the language, using that operator doesn't help with that. 
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<div>On another hand, I agree that this is the sexiest, less intrusive solution.</div>
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On 17 févr. 2017 13:36 -0500, Adrian Zubarev via swift-evolution <swift-evolution@swift.org>, wrote:<br />
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<p>My suggestion is that <code>-></code> would be the conditional arrow that can be both <em>pure</em> or <em>impure</em>. That would make <code>@pure func foo(_ f: @pure (Int) -> Int) -> Int</code> equivalent to <code>func foo(_ f: (Int) ~> Int) -> Int</code>. Plus depending on the implementation the compiler <em>might</em> be able to help and tell you that <code>foo</code> could use <code>~></code> instead.</p>
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<div style="font-family:helvetica,arial;font-size:13px">-- <br />
Adrian Zubarev<br />
Sent with Airmail</div>
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<p class="airmail_on">Am 17. Februar 2017 um 19:25:41, Anton Zhilin (<a href="mailto:antonyzhilin@gmail.com">antonyzhilin@gmail.com</a>) schrieb:</p>
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<p style="margin:0px 0px 1.2em!important"><span>Just let</span></p>
<pre style="font-family:Consolas,Inconsolata,Courier,monospace;line-height:1.2em;margin:1.2em 0px">
<span><code style="font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;background-color:rgb(248,248,248);white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important">@pure func foo(_ f: (Int) -> Int) -> Int<span style="font-size:0.85em">
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<p style="margin:0px 0px 1.2em!important">be the same as those two combined:</p>
<pre style="font-family:Consolas,Inconsolata,Courier,monospace;line-height:1.2em;margin:1.2em 0px">
<code style="font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;background-color:rgb(248,248,248);white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important">@pure func foo(_ f: @pure (Int) -> Int) -> Int
func foo(_ f: (Int) -> Int) -> Int<span style="font-size:0.85em">
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<p style="margin:0px 0px 1.2em!important">No need for anything like “re-pure” or <code style="font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">≃></code>.</p>
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