235 lines
30 KiB
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235 lines
30 KiB
HTML
<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/newkirk/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/utf8_iter-1.0.4/src/report.rs`."><title>report.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="utf8_iter" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="../../static.files/src-script-813739b1.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">utf8_iter/</div>report.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-3"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="comment">// Copyright Mozilla Foundation
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<a href=#2 id=2 data-nosnippet>2</a>//
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<a href=#3 id=3 data-nosnippet>3</a>// Licensed under the Apache License (Version 2.0), or the MIT license,
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<a href=#4 id=4 data-nosnippet>4</a>// (the "Licenses") at your option. You may not use this file except in
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<a href=#5 id=5 data-nosnippet>5</a>// compliance with one of the Licenses. You may obtain copies of the
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<a href=#6 id=6 data-nosnippet>6</a>// Licenses at:
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<a href=#7 id=7 data-nosnippet>7</a>//
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<a href=#8 id=8 data-nosnippet>8</a>// https://www.apache.org/licenses/LICENSE-2.0
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<a href=#9 id=9 data-nosnippet>9</a>// https://opensource.org/licenses/MIT
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<a href=#10 id=10 data-nosnippet>10</a>//
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<a href=#11 id=11 data-nosnippet>11</a>// Unless required by applicable law or agreed to in writing, software
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<a href=#12 id=12 data-nosnippet>12</a>// distributed under the Licenses is distributed on an "AS IS" BASIS,
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<a href=#13 id=13 data-nosnippet>13</a>// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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<a href=#14 id=14 data-nosnippet>14</a>// See the Licenses for the specific language governing permissions and
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<a href=#15 id=15 data-nosnippet>15</a>// limitations under the Licenses.
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<a href=#16 id=16 data-nosnippet>16</a>
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<a href=#17 id=17 data-nosnippet>17</a></span><span class="kw">use </span><span class="kw">crate</span>::in_inclusive_range8;
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<a href=#18 id=18 data-nosnippet>18</a><span class="kw">use </span><span class="kw">crate</span>::UTF8_DATA;
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<a href=#19 id=19 data-nosnippet>19</a><span class="kw">use </span>core::fmt::Formatter;
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<a href=#20 id=20 data-nosnippet>20</a><span class="kw">use </span>core::iter::FusedIterator;
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<a href=#21 id=21 data-nosnippet>21</a>
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<a href=#22 id=22 data-nosnippet>22</a><span class="doccomment">/// A type for signaling UTF-8 errors.
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<a href=#23 id=23 data-nosnippet>23</a>///
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<a href=#24 id=24 data-nosnippet>24</a>/// Note: `core::error::Error` is not implemented due to implementing it
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<a href=#25 id=25 data-nosnippet>25</a>/// being an [unstable feature][1] at the time of writing.
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<a href=#26 id=26 data-nosnippet>26</a>///
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<a href=#27 id=27 data-nosnippet>27</a>/// [1]: https://github.com/rust-lang/rust/issues/103765
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<a href=#28 id=28 data-nosnippet>28</a></span><span class="attr">#[derive(Debug, PartialEq)]
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<a href=#29 id=29 data-nosnippet>29</a>#[non_exhaustive]
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<a href=#30 id=30 data-nosnippet>30</a></span><span class="kw">pub struct </span>Utf8CharsError;
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<a href=#31 id=31 data-nosnippet>31</a>
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<a href=#32 id=32 data-nosnippet>32</a><span class="kw">impl </span>core::fmt::Display <span class="kw">for </span>Utf8CharsError {
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<a href=#33 id=33 data-nosnippet>33</a> <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>Formatter<<span class="lifetime">'_</span>>) -> <span class="prelude-ty">Result</span><(), core::fmt::Error> {
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<a href=#34 id=34 data-nosnippet>34</a> <span class="macro">write!</span>(f, <span class="string">"byte sequence not well-formed UTF-8"</span>)
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<a href=#35 id=35 data-nosnippet>35</a> }
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<a href=#36 id=36 data-nosnippet>36</a>}
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<a href=#37 id=37 data-nosnippet>37</a>
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<a href=#38 id=38 data-nosnippet>38</a><span class="doccomment">/// Iterator by `Result<char,Utf8CharsError>` over `&[u8]` that contains
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<a href=#39 id=39 data-nosnippet>39</a>/// potentially-invalid UTF-8. There is exactly one `Utf8CharsError` per
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<a href=#40 id=40 data-nosnippet>40</a>/// each error as defined by the WHATWG Encoding Standard.
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<a href=#41 id=41 data-nosnippet>41</a>///
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<a href=#42 id=42 data-nosnippet>42</a>/// ```
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<a href=#43 id=43 data-nosnippet>43</a>/// let s = b"a\xFFb\xFF\x80c\xF0\x9F\xA4\xA6\xF0\x9F\xA4\xF0\x9F\xF0d";
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<a href=#44 id=44 data-nosnippet>44</a>/// let plain = utf8_iter::Utf8Chars::new(s);
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<a href=#45 id=45 data-nosnippet>45</a>/// let reporting = utf8_iter::ErrorReportingUtf8Chars::new(s);
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<a href=#46 id=46 data-nosnippet>46</a>/// assert!(plain.eq(reporting.map(|r| r.unwrap_or('\u{FFFD}'))));
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<a href=#47 id=47 data-nosnippet>47</a>/// ```
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<a href=#48 id=48 data-nosnippet>48</a></span><span class="attr">#[derive(Debug, Clone)]
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<a href=#49 id=49 data-nosnippet>49</a></span><span class="kw">pub struct </span>ErrorReportingUtf8Chars<<span class="lifetime">'a</span>> {
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<a href=#50 id=50 data-nosnippet>50</a> remaining: <span class="kw-2">&</span><span class="lifetime">'a </span>[u8],
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<a href=#51 id=51 data-nosnippet>51</a>}
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<a href=#52 id=52 data-nosnippet>52</a>
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<a href=#53 id=53 data-nosnippet>53</a><span class="kw">impl</span><<span class="lifetime">'a</span>> ErrorReportingUtf8Chars<<span class="lifetime">'a</span>> {
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<a href=#54 id=54 data-nosnippet>54</a> <span class="attr">#[inline(always)]
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<a href=#55 id=55 data-nosnippet>55</a> </span><span class="doccomment">/// Creates the iterator from a byte slice.
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<a href=#56 id=56 data-nosnippet>56</a> </span><span class="kw">pub fn </span>new(bytes: <span class="kw-2">&</span><span class="lifetime">'a </span>[u8]) -> <span class="self">Self </span>{
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<a href=#57 id=57 data-nosnippet>57</a> ErrorReportingUtf8Chars::<<span class="lifetime">'a</span>> { remaining: bytes }
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<a href=#58 id=58 data-nosnippet>58</a> }
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<a href=#59 id=59 data-nosnippet>59</a>
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<a href=#60 id=60 data-nosnippet>60</a> <span class="doccomment">/// Views the current remaining data in the iterator as a subslice
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<a href=#61 id=61 data-nosnippet>61</a> /// of the original slice.
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<a href=#62 id=62 data-nosnippet>62</a> </span><span class="attr">#[inline(always)]
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<a href=#63 id=63 data-nosnippet>63</a> </span><span class="kw">pub fn </span>as_slice(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="lifetime">'a </span>[u8] {
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<a href=#64 id=64 data-nosnippet>64</a> <span class="self">self</span>.remaining
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<a href=#65 id=65 data-nosnippet>65</a> }
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<a href=#66 id=66 data-nosnippet>66</a>
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<a href=#67 id=67 data-nosnippet>67</a> <span class="attr">#[inline(never)]
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<a href=#68 id=68 data-nosnippet>68</a> </span><span class="kw">fn </span>next_fallback(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="prelude-ty">Result</span><char, Utf8CharsError>> {
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<a href=#69 id=69 data-nosnippet>69</a> <span class="kw">if </span><span class="self">self</span>.remaining.is_empty() {
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<a href=#70 id=70 data-nosnippet>70</a> <span class="kw">return </span><span class="prelude-val">None</span>;
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<a href=#71 id=71 data-nosnippet>71</a> }
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<a href=#72 id=72 data-nosnippet>72</a> <span class="kw">let </span>first = <span class="self">self</span>.remaining[<span class="number">0</span>];
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<a href=#73 id=73 data-nosnippet>73</a> <span class="kw">if </span>first < <span class="number">0x80 </span>{
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<a href=#74 id=74 data-nosnippet>74</a> <span class="self">self</span>.remaining = <span class="kw-2">&</span><span class="self">self</span>.remaining[<span class="number">1</span>..];
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<a href=#75 id=75 data-nosnippet>75</a> <span class="kw">return </span><span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(char::from(first)));
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<a href=#76 id=76 data-nosnippet>76</a> }
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<a href=#77 id=77 data-nosnippet>77</a> <span class="kw">if </span>!in_inclusive_range8(first, <span class="number">0xC2</span>, <span class="number">0xF4</span>) || <span class="self">self</span>.remaining.len() == <span class="number">1 </span>{
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<a href=#78 id=78 data-nosnippet>78</a> <span class="self">self</span>.remaining = <span class="kw-2">&</span><span class="self">self</span>.remaining[<span class="number">1</span>..];
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<a href=#79 id=79 data-nosnippet>79</a> <span class="kw">return </span><span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(Utf8CharsError));
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<a href=#80 id=80 data-nosnippet>80</a> }
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<a href=#81 id=81 data-nosnippet>81</a> <span class="kw">let </span>second = <span class="self">self</span>.remaining[<span class="number">1</span>];
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<a href=#82 id=82 data-nosnippet>82</a> <span class="kw">let </span>(lower_bound, upper_bound) = <span class="kw">match </span>first {
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<a href=#83 id=83 data-nosnippet>83</a> <span class="number">0xE0 </span>=> (<span class="number">0xA0</span>, <span class="number">0xBF</span>),
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<a href=#84 id=84 data-nosnippet>84</a> <span class="number">0xED </span>=> (<span class="number">0x80</span>, <span class="number">0x9F</span>),
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<a href=#85 id=85 data-nosnippet>85</a> <span class="number">0xF0 </span>=> (<span class="number">0x90</span>, <span class="number">0xBF</span>),
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<a href=#86 id=86 data-nosnippet>86</a> <span class="number">0xF4 </span>=> (<span class="number">0x80</span>, <span class="number">0x8F</span>),
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<a href=#87 id=87 data-nosnippet>87</a> <span class="kw">_ </span>=> (<span class="number">0x80</span>, <span class="number">0xBF</span>),
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<a href=#88 id=88 data-nosnippet>88</a> };
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<a href=#89 id=89 data-nosnippet>89</a> <span class="kw">if </span>!in_inclusive_range8(second, lower_bound, upper_bound) {
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<a href=#90 id=90 data-nosnippet>90</a> <span class="self">self</span>.remaining = <span class="kw-2">&</span><span class="self">self</span>.remaining[<span class="number">1</span>..];
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<a href=#91 id=91 data-nosnippet>91</a> <span class="kw">return </span><span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(Utf8CharsError));
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<a href=#92 id=92 data-nosnippet>92</a> }
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<a href=#93 id=93 data-nosnippet>93</a> <span class="kw">if </span>first < <span class="number">0xE0 </span>{
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<a href=#94 id=94 data-nosnippet>94</a> <span class="self">self</span>.remaining = <span class="kw-2">&</span><span class="self">self</span>.remaining[<span class="number">2</span>..];
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<a href=#95 id=95 data-nosnippet>95</a> <span class="kw">let </span>point = ((u32::from(first) & <span class="number">0x1F</span>) << <span class="number">6</span>) | (u32::from(second) & <span class="number">0x3F</span>);
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<a href=#96 id=96 data-nosnippet>96</a> <span class="kw">return </span><span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="kw">unsafe </span>{ char::from_u32_unchecked(point) }));
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<a href=#97 id=97 data-nosnippet>97</a> }
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<a href=#98 id=98 data-nosnippet>98</a> <span class="kw">if </span><span class="self">self</span>.remaining.len() == <span class="number">2 </span>{
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<a href=#99 id=99 data-nosnippet>99</a> <span class="self">self</span>.remaining = <span class="kw-2">&</span><span class="self">self</span>.remaining[<span class="number">2</span>..];
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<a href=#100 id=100 data-nosnippet>100</a> <span class="kw">return </span><span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(Utf8CharsError));
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<a href=#101 id=101 data-nosnippet>101</a> }
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<a href=#102 id=102 data-nosnippet>102</a> <span class="kw">let </span>third = <span class="self">self</span>.remaining[<span class="number">2</span>];
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<a href=#103 id=103 data-nosnippet>103</a> <span class="kw">if </span>!in_inclusive_range8(third, <span class="number">0x80</span>, <span class="number">0xBF</span>) {
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<a href=#104 id=104 data-nosnippet>104</a> <span class="self">self</span>.remaining = <span class="kw-2">&</span><span class="self">self</span>.remaining[<span class="number">2</span>..];
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<a href=#105 id=105 data-nosnippet>105</a> <span class="kw">return </span><span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(Utf8CharsError));
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<a href=#106 id=106 data-nosnippet>106</a> }
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<a href=#107 id=107 data-nosnippet>107</a> <span class="kw">if </span>first < <span class="number">0xF0 </span>{
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<a href=#108 id=108 data-nosnippet>108</a> <span class="self">self</span>.remaining = <span class="kw-2">&</span><span class="self">self</span>.remaining[<span class="number">3</span>..];
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<a href=#109 id=109 data-nosnippet>109</a> <span class="kw">let </span>point = ((u32::from(first) & <span class="number">0xF</span>) << <span class="number">12</span>)
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<a href=#110 id=110 data-nosnippet>110</a> | ((u32::from(second) & <span class="number">0x3F</span>) << <span class="number">6</span>)
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<a href=#111 id=111 data-nosnippet>111</a> | (u32::from(third) & <span class="number">0x3F</span>);
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<a href=#112 id=112 data-nosnippet>112</a> <span class="kw">return </span><span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="kw">unsafe </span>{ char::from_u32_unchecked(point) }));
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<a href=#113 id=113 data-nosnippet>113</a> }
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<a href=#114 id=114 data-nosnippet>114</a> <span class="comment">// At this point, we have a valid 3-byte prefix of a
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<a href=#115 id=115 data-nosnippet>115</a> // four-byte sequence that has to be incomplete, because
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<a href=#116 id=116 data-nosnippet>116</a> // otherwise `next()` would have succeeded.
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<a href=#117 id=117 data-nosnippet>117</a> </span><span class="self">self</span>.remaining = <span class="kw-2">&</span><span class="self">self</span>.remaining[<span class="number">3</span>..];
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<a href=#118 id=118 data-nosnippet>118</a> <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(Utf8CharsError))
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<a href=#119 id=119 data-nosnippet>119</a> }
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<a href=#120 id=120 data-nosnippet>120</a>}
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<a href=#121 id=121 data-nosnippet>121</a>
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<a href=#122 id=122 data-nosnippet>122</a><span class="kw">impl</span><<span class="lifetime">'a</span>> Iterator <span class="kw">for </span>ErrorReportingUtf8Chars<<span class="lifetime">'a</span>> {
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<a href=#123 id=123 data-nosnippet>123</a> <span class="kw">type </span>Item = <span class="prelude-ty">Result</span><char, Utf8CharsError>;
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<a href=#124 id=124 data-nosnippet>124</a>
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<a href=#125 id=125 data-nosnippet>125</a> <span class="attr">#[inline]
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<a href=#126 id=126 data-nosnippet>126</a> </span><span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="prelude-ty">Result</span><char, Utf8CharsError>> {
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<a href=#127 id=127 data-nosnippet>127</a> <span class="comment">// This loop is only broken out of as goto forward
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<a href=#128 id=128 data-nosnippet>128</a> </span><span class="attr">#[allow(clippy::never_loop)]
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<a href=#129 id=129 data-nosnippet>129</a> </span><span class="kw">loop </span>{
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<a href=#130 id=130 data-nosnippet>130</a> <span class="kw">if </span><span class="self">self</span>.remaining.len() < <span class="number">4 </span>{
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<a href=#131 id=131 data-nosnippet>131</a> <span class="kw">break</span>;
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<a href=#132 id=132 data-nosnippet>132</a> }
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<a href=#133 id=133 data-nosnippet>133</a> <span class="kw">let </span>first = <span class="self">self</span>.remaining[<span class="number">0</span>];
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<a href=#134 id=134 data-nosnippet>134</a> <span class="kw">if </span>first < <span class="number">0x80 </span>{
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<a href=#135 id=135 data-nosnippet>135</a> <span class="self">self</span>.remaining = <span class="kw-2">&</span><span class="self">self</span>.remaining[<span class="number">1</span>..];
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<a href=#136 id=136 data-nosnippet>136</a> <span class="kw">return </span><span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(char::from(first)));
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<a href=#137 id=137 data-nosnippet>137</a> }
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<a href=#138 id=138 data-nosnippet>138</a> <span class="kw">let </span>second = <span class="self">self</span>.remaining[<span class="number">1</span>];
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<a href=#139 id=139 data-nosnippet>139</a> <span class="kw">if </span>in_inclusive_range8(first, <span class="number">0xC2</span>, <span class="number">0xDF</span>) {
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<a href=#140 id=140 data-nosnippet>140</a> <span class="kw">if </span>!in_inclusive_range8(second, <span class="number">0x80</span>, <span class="number">0xBF</span>) {
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<a href=#141 id=141 data-nosnippet>141</a> <span class="kw">break</span>;
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<a href=#142 id=142 data-nosnippet>142</a> }
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<a href=#143 id=143 data-nosnippet>143</a> <span class="kw">let </span>point = ((u32::from(first) & <span class="number">0x1F</span>) << <span class="number">6</span>) | (u32::from(second) & <span class="number">0x3F</span>);
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<a href=#144 id=144 data-nosnippet>144</a> <span class="self">self</span>.remaining = <span class="kw-2">&</span><span class="self">self</span>.remaining[<span class="number">2</span>..];
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<a href=#145 id=145 data-nosnippet>145</a> <span class="kw">return </span><span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="kw">unsafe </span>{ char::from_u32_unchecked(point) }));
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<a href=#146 id=146 data-nosnippet>146</a> }
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<a href=#147 id=147 data-nosnippet>147</a> <span class="comment">// This table-based formulation was benchmark-based in encoding_rs,
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<a href=#148 id=148 data-nosnippet>148</a> // but it hasn't been re-benchmarked in this iterator context.
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<a href=#149 id=149 data-nosnippet>149</a> </span><span class="kw">let </span>third = <span class="self">self</span>.remaining[<span class="number">2</span>];
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<a href=#150 id=150 data-nosnippet>150</a> <span class="kw">if </span>first < <span class="number">0xF0 </span>{
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<a href=#151 id=151 data-nosnippet>151</a> <span class="kw">if </span>((UTF8_DATA.table[usize::from(second)]
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<a href=#152 id=152 data-nosnippet>152</a> & UTF8_DATA.table[usize::from(first) + <span class="number">0x80</span>])
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<a href=#153 id=153 data-nosnippet>153</a> | (third >> <span class="number">6</span>))
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<a href=#154 id=154 data-nosnippet>154</a> != <span class="number">2
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<a href=#155 id=155 data-nosnippet>155</a> </span>{
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<a href=#156 id=156 data-nosnippet>156</a> <span class="kw">break</span>;
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<a href=#157 id=157 data-nosnippet>157</a> }
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<a href=#158 id=158 data-nosnippet>158</a> <span class="kw">let </span>point = ((u32::from(first) & <span class="number">0xF</span>) << <span class="number">12</span>)
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<a href=#159 id=159 data-nosnippet>159</a> | ((u32::from(second) & <span class="number">0x3F</span>) << <span class="number">6</span>)
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<a href=#160 id=160 data-nosnippet>160</a> | (u32::from(third) & <span class="number">0x3F</span>);
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<a href=#161 id=161 data-nosnippet>161</a> <span class="self">self</span>.remaining = <span class="kw-2">&</span><span class="self">self</span>.remaining[<span class="number">3</span>..];
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<a href=#162 id=162 data-nosnippet>162</a> <span class="kw">return </span><span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="kw">unsafe </span>{ char::from_u32_unchecked(point) }));
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<a href=#163 id=163 data-nosnippet>163</a> }
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<a href=#164 id=164 data-nosnippet>164</a> <span class="kw">let </span>fourth = <span class="self">self</span>.remaining[<span class="number">3</span>];
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<a href=#165 id=165 data-nosnippet>165</a> <span class="kw">if </span>(u16::from(
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<a href=#166 id=166 data-nosnippet>166</a> UTF8_DATA.table[usize::from(second)] & UTF8_DATA.table[usize::from(first) + <span class="number">0x80</span>],
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<a href=#167 id=167 data-nosnippet>167</a> ) | u16::from(third >> <span class="number">6</span>)
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<a href=#168 id=168 data-nosnippet>168</a> | (u16::from(fourth & <span class="number">0xC0</span>) << <span class="number">2</span>))
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<a href=#169 id=169 data-nosnippet>169</a> != <span class="number">0x202
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<a href=#170 id=170 data-nosnippet>170</a> </span>{
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<a href=#171 id=171 data-nosnippet>171</a> <span class="kw">break</span>;
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<a href=#172 id=172 data-nosnippet>172</a> }
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<a href=#173 id=173 data-nosnippet>173</a> <span class="kw">let </span>point = ((u32::from(first) & <span class="number">0x7</span>) << <span class="number">18</span>)
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<a href=#174 id=174 data-nosnippet>174</a> | ((u32::from(second) & <span class="number">0x3F</span>) << <span class="number">12</span>)
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<a href=#175 id=175 data-nosnippet>175</a> | ((u32::from(third) & <span class="number">0x3F</span>) << <span class="number">6</span>)
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<a href=#176 id=176 data-nosnippet>176</a> | (u32::from(fourth) & <span class="number">0x3F</span>);
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<a href=#177 id=177 data-nosnippet>177</a> <span class="self">self</span>.remaining = <span class="kw-2">&</span><span class="self">self</span>.remaining[<span class="number">4</span>..];
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<a href=#178 id=178 data-nosnippet>178</a> <span class="kw">return </span><span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="kw">unsafe </span>{ char::from_u32_unchecked(point) }));
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<a href=#179 id=179 data-nosnippet>179</a> }
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<a href=#180 id=180 data-nosnippet>180</a> <span class="self">self</span>.next_fallback()
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<a href=#181 id=181 data-nosnippet>181</a> }
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<a href=#182 id=182 data-nosnippet>182</a>}
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<a href=#183 id=183 data-nosnippet>183</a>
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<a href=#184 id=184 data-nosnippet>184</a><span class="kw">impl</span><<span class="lifetime">'a</span>> DoubleEndedIterator <span class="kw">for </span>ErrorReportingUtf8Chars<<span class="lifetime">'a</span>> {
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<a href=#185 id=185 data-nosnippet>185</a> <span class="attr">#[inline]
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<a href=#186 id=186 data-nosnippet>186</a> </span><span class="kw">fn </span>next_back(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="prelude-ty">Result</span><char, Utf8CharsError>> {
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<a href=#187 id=187 data-nosnippet>187</a> <span class="kw">if </span><span class="self">self</span>.remaining.is_empty() {
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<a href=#188 id=188 data-nosnippet>188</a> <span class="kw">return </span><span class="prelude-val">None</span>;
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<a href=#189 id=189 data-nosnippet>189</a> }
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<a href=#190 id=190 data-nosnippet>190</a> <span class="kw">let </span><span class="kw-2">mut </span>attempt = <span class="number">1</span>;
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<a href=#191 id=191 data-nosnippet>191</a> <span class="kw">for </span>b <span class="kw">in </span><span class="self">self</span>.remaining.iter().rev() {
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<a href=#192 id=192 data-nosnippet>192</a> <span class="kw">if </span>b & <span class="number">0xC0 </span>!= <span class="number">0x80 </span>{
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<a href=#193 id=193 data-nosnippet>193</a> <span class="kw">let </span>(head, tail) = <span class="self">self</span>.remaining.split_at(<span class="self">self</span>.remaining.len() - attempt);
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<a href=#194 id=194 data-nosnippet>194</a> <span class="kw">let </span><span class="kw-2">mut </span>inner = ErrorReportingUtf8Chars::new(tail);
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<a href=#195 id=195 data-nosnippet>195</a> <span class="kw">let </span>candidate = inner.next();
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<a href=#196 id=196 data-nosnippet>196</a> <span class="kw">if </span>inner.as_slice().is_empty() {
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<a href=#197 id=197 data-nosnippet>197</a> <span class="self">self</span>.remaining = head;
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<a href=#198 id=198 data-nosnippet>198</a> <span class="kw">return </span>candidate;
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<a href=#199 id=199 data-nosnippet>199</a> }
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<a href=#200 id=200 data-nosnippet>200</a> <span class="kw">break</span>;
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<a href=#201 id=201 data-nosnippet>201</a> }
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<a href=#202 id=202 data-nosnippet>202</a> <span class="kw">if </span>attempt == <span class="number">4 </span>{
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<a href=#203 id=203 data-nosnippet>203</a> <span class="kw">break</span>;
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<a href=#204 id=204 data-nosnippet>204</a> }
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<a href=#205 id=205 data-nosnippet>205</a> attempt += <span class="number">1</span>;
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<a href=#206 id=206 data-nosnippet>206</a> }
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<a href=#207 id=207 data-nosnippet>207</a>
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<a href=#208 id=208 data-nosnippet>208</a> <span class="self">self</span>.remaining = <span class="kw-2">&</span><span class="self">self</span>.remaining[..<span class="self">self</span>.remaining.len() - <span class="number">1</span>];
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<a href=#209 id=209 data-nosnippet>209</a> <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(Utf8CharsError))
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<a href=#210 id=210 data-nosnippet>210</a> }
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<a href=#211 id=211 data-nosnippet>211</a>}
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<a href=#212 id=212 data-nosnippet>212</a>
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<a href=#213 id=213 data-nosnippet>213</a><span class="kw">impl </span>FusedIterator <span class="kw">for </span>ErrorReportingUtf8Chars<<span class="lifetime">'_</span>> {}
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<a href=#214 id=214 data-nosnippet>214</a>
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<a href=#215 id=215 data-nosnippet>215</a><span class="attr">#[cfg(test)]
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<a href=#216 id=216 data-nosnippet>216</a></span><span class="kw">mod </span>tests {
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<a href=#217 id=217 data-nosnippet>217</a> <span class="kw">use </span><span class="kw">crate</span>::ErrorReportingUtf8Chars;
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<a href=#218 id=218 data-nosnippet>218</a>
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<a href=#219 id=219 data-nosnippet>219</a> <span class="comment">// Should be a static assert, but not taking a dependency for this.
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<a href=#220 id=220 data-nosnippet>220</a> </span><span class="attr">#[test]
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<a href=#221 id=221 data-nosnippet>221</a> </span><span class="kw">fn </span>test_size() {
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<a href=#222 id=222 data-nosnippet>222</a> <span class="macro">assert_eq!</span>(
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<a href=#223 id=223 data-nosnippet>223</a> core::mem::size_of::<<span class="prelude-ty">Option</span><<ErrorReportingUtf8Chars<<span class="lifetime">'_</span>> <span class="kw">as </span>Iterator>::Item>>(),
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<a href=#224 id=224 data-nosnippet>224</a> core::mem::size_of::<<span class="prelude-ty">Option</span><char>>()
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<a href=#225 id=225 data-nosnippet>225</a> );
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<a href=#226 id=226 data-nosnippet>226</a> }
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<a href=#227 id=227 data-nosnippet>227</a>
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<a href=#228 id=228 data-nosnippet>228</a> <span class="attr">#[test]
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<a href=#229 id=229 data-nosnippet>229</a> </span><span class="kw">fn </span>test_eq() {
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<a href=#230 id=230 data-nosnippet>230</a> <span class="kw">let </span>a: <ErrorReportingUtf8Chars<<span class="lifetime">'_</span>> <span class="kw">as </span>Iterator>::Item = <span class="prelude-val">Ok</span>(<span class="string">'a'</span>);
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<a href=#231 id=231 data-nosnippet>231</a> <span class="kw">let </span>a_again: <ErrorReportingUtf8Chars<<span class="lifetime">'_</span>> <span class="kw">as </span>Iterator>::Item = <span class="prelude-val">Ok</span>(<span class="string">'a'</span>);
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<a href=#232 id=232 data-nosnippet>232</a> <span class="macro">assert_eq!</span>(a, a_again);
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<a href=#233 id=233 data-nosnippet>233</a> }
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<a href=#234 id=234 data-nosnippet>234</a>}
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</code></pre></div></section></main></body></html> |