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</pre><pre class="rust ">
<span class="comment">// Copyright 2016 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="doccomment">/// An iterator whose items are random accessible efficiently</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The iterator's .len() and size_hint() must be exact.</span>
<span class="doccomment">/// `.len()` must be cheap to call.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// .get_unchecked() must return distinct mutable references for distinct</span>
<span class="doccomment">/// indices (if applicable), and must return a valid reference if index is in</span>
<span class="doccomment">/// 0..self.len().</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">trait</span> <span class="ident">TrustedRandomAccess</span> : <span class="ident">ExactSizeIterator</span> {
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="self">Self</span>::<span class="ident">Item</span>;
<span class="doccomment">/// Returns `true` if getting an iterator element may have</span>
<span class="doccomment">/// side effects. Remember to take inner iterators into account.</span>
<span class="kw">fn</span> <span class="ident">may_have_side_effect</span>() <span class="op">-></span> <span class="ident">bool</span>;
}
</pre>
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