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.error { color:#AA0000; }</style></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div class="bloop_markdown"><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>
<p></p></div><div class="bloop_original_html"><style>body{font-family:Helvetica,Arial;font-size:13px}</style><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px; color: rgba(0,0,0,1.0); margin: 0px; line-height: auto;"><br></div> <br> <div id="bloop_sign_1487356322068953088" class="bloop_sign"><div style="font-family:helvetica,arial;font-size:13px">-- <br>Adrian Zubarev<br>Sent with Airmail</div></div> <br><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> <blockquote type="cite" class="clean_bq"><span><div><div></div><div>
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<p style="margin:0px 0px 1.2em!important">Just let</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: (Int) -> Int) -> Int<span style="font-size:0.85em">
</span></code></pre>
<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">
</span></code></pre>
<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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